Summary operating results for each of our business segments were as follows (in millions): 2019 2018 2017 Net sales Aeronautics $ 23,693 $ 21,242 $ 19,410 Missiles and Fire Control 10,131 8,462 7,282 Rotary and Mission Systems 15,128 14,250 13,663 Space 10,860 9,808 9,605 Total net sales $ 59,812 $ 53,762 $ 49,960 Operating profit Aeronautics $ 2,521 $ 2,272 $ 2,176 Missiles and Fire Control 1,441 1,248 1,034 Rotary and Mission Systems 1,421 1,302 902 Space 1,191 1,055 980 Total business segment operating profit 6,574 5,877 5,092 Unallocated items FAS/CAS operating adjustment (a) 2,049 1,803 1,613 Stock-based compensation (189 ) (173 ) (158 ) Severance and restructuring charges (b)  (96 )  Other, net (c) 111 (77 ) 197 Total unallocated, net 1,971 1,457 1,652 Total consolidated operating profit $ 8,545 $ 7,334 $ 6,744 (a) The FAS/CAS operating adjustment represents the difference between the service cost component of FAS pension expense and total pension costs recoverable on U.S. Government contracts as determined in accordance with CAS. For a detail of the FAS/CAS operating adjustment and the total net FAS/CAS pension adjustment, see the table below. (b) See  Note 15  Severance and Restructuring Charges  for information on charges related to certain severance actions at our business segments. Severance and restructuring charges for initiatives that are not significant are included in business segment operating profit. (c) Other, net in 2019 includes a previously deferred non-cash gain of $51 million related to properties sold in 2015 as a result of completing our remaining obligations and a gain of $34 million for the sale of its Distributed Energy Solutions business . Other, net in 2018 includes a non-cash asset impairment charge of $110 million related to our equity method investee , AMMROC (see  Note 1  Significant Accounting Policies  ). Other, net in 2017 includes a previously deferred non-cash gain of $198 million related to properties sold in 2015 as a result of completing our remaining obligations (see  Note 7  Property, Plant and Equipment, net ) and a $64 million charge, which represents our portion of a non-cash asset impairment charge recorded by AMMROC. (see  Note 1  Significant Accounting Policies ). Total net FAS/CAS pension adjustments, including the service and non-service cost components of FAS pension expense, were as follows (in millions): 2019 2018 2017 Total FAS expense and CAS costs FAS pension expense $ (1,093 ) $ (1,431 ) $ (1,372 ) Less: CAS pension cost 2,565 2,433 2,248 Net FAS/CAS pension adjustment $ 1,472 $ 1,002 $ 876 Service and non-service cost reconciliation FAS pension service cost (516 ) (630 ) (635 ) Less: CAS pension cost 2,565 2,433 2,248 FAS/CAS operating adjustment 2,049 1,803 1,613 Non-operating FAS pension expense (a) (577 ) (801 ) (737 ) Net FAS/CAS pension adjustment $ 1,472 $ 1,002 $ 876 (a) We record the non-service cost components of net periodic benefit cost as part of other non-operating expense, net in the consolidated statement of earnings. The non-service cost components in the table above relate only to our qualified defined benefit pension plans. We incurred total non-service costs for our qualified defined benefit pension plans in the table above, along with similar costs for our other postretirement benefit plans of $116 million , $67 million , and $109 million for the years ended 2019 , 2018 and 2017 . We recover CAS pension and other postretirement benefit plan cost through the pricing of our products and services on U.S. Government contracts and, therefore, recognize CAS cost in each of our business segments net sales and cost of sales. Our consolidated financial statements must present FAS pension and other postretirement benefit plan expense calculated in accordance with FAS requirements under U.S. GAAP. The operating portion of the net FAS/CAS pension adjustment represents the difference between the service cost component of FAS pension expense and total CAS pension cost. The non-service FAS pension cost component is included in other non-operating expense, net in our consolidated statements of earnings. The net FAS/CAS pension adjustment increases or decreases CAS pension cost to equal total FAS pension expense (both service and non-service). 2019 2018 2017 Intersegment sales Aeronautics $ 217 $ 120 $ 122 Missiles and Fire Control 515 423 355 Rotary and Mission Systems (a) 1,872 1,759 1,801 Space 352 237 111 Total intersegment sales $ 2,956 $ 2,539 $ 2,389 Depreciation and amortization Aeronautics $ 318 $ 304 $ 311 Missiles and Fire Control 124 105 99 Rotary and Mission Systems 464 458 468 Space 213 229 245 Total business segment depreciation and amortization 1,119 1,096 1,123 Corporate activities 70 65 72 Total depreciation and amortization $ 1,189 $ 1,161 $ 1,195 Capital expenditures Aeronautics $ 526 $ 460 $ 371 Missiles and Fire Control 300 244 156 Rotary and Mission Systems 272 255 308 Space 258 255 179 Total business segment capital expenditures 1,356 1,214 1,014 Corporate activities 128 64 163 Total capital expenditures $ 1,484 $ 1,278 $ 1,177 (a) During 2019 a program within our RMS business segment, which primarily performed work for our Aeronautics business segment, was realigned under Aeronautics. The 2018 and 2017 RMS intersegment sales have been adjusted to reflect the current program structure. Net Sales by Type Net sales by total products and services, contract type, customer category and geographic region for each of our business segments were as follows (in millions): 2019 Aeronautics MFC RMS Space Total Net sales Products $ 20,319 $ 8,424 $ 12,206 $ 9,104 $ 50,053 Services 3,374 1,707 2,922 1,756 9,759 Total net sales $ 23,693 $ 10,131 $ 15,128 $ 10,860 $ 59,812 Net sales by contract type Fixed-price $ 17,239 $ 6,449 $ 10,382 $ 2,135 $ 36,205 Cost-reimbursable 6,454 3,682 4,746 8,725 23,607 Total net sales $ 23,693 $ 10,131 $ 15,128 $ 10,860 $ 59,812 Net sales by customer U.S. Government $ 14,776 $ 7,524 $ 10,803 $ 9,322 $ 42,425 International (a) 8,733 2,465 3,822 1,511 16,531 U.S. commercial and other 184 142 503 27 856 Total net sales $ 23,693 $ 10,131 $ 15,128 $ 10,860 $ 59,812 Net sales by geographic region United States $ 14,960 $ 7,666 $ 11,306 $ 9,349 $ 43,281 Asia Pacific 3,882 420 1,451 73 5,826 Europe 3,224 516 769 1,419 5,928 Middle East 1,465 1,481 979 19 3,944 Other 162 48 623  833 Total net sales $ 23,693 $ 10,131 $ 15,128 $ 10,860 $ 59,812 (a) International sales include foreign military sales contracted through the U.S. Government, direct commercial sales with international governments and commercial and other sales to international customers. 2018 Aeronautics MFC RMS Space Total Net sales Products $ 18,207 $ 6,945 $ 11,714 $ 8,139 $ 45,005 Services 3,035 1,517 2,536 1,669 8,757 Total net sales $ 21,242 $ 8,462 $ 14,250 $ 9,808 $ 53,762 Net sales by contract type Fixed-price $ 15,719 $ 5,653 $ 9,975 $ 1,892 $ 33,239 Cost-reimbursable 5,523 2,809 4,275 7,916 20,523 Total net sales $ 21,242 $ 8,462 $ 14,250 $ 9,808 $ 53,762 Net sales by customer U.S. Government $ 13,321 $ 6,088 $ 10,083 $ 8,224 $ 37,716 International (a) 7,735 2,190 3,693 1,538 15,156 U.S. commercial and other 186 184 474 46 890 Total net sales $ 21,242 $ 8,462 $ 14,250 $ 9,808 $ 53,762 Net sales by geographic region United States $ 13,507 $ 6,272 $ 10,557 $ 8,270 $ 38,606 Asia Pacific 3,335 427 1,433 85 5,280 Europe 2,837 321 829 1,416 5,403 Middle East 1,380 1,404 781 37 3,602 Other 183 38 650  871 Total net sales $ 21,242 $ 8,462 $ 14,250 $ 9,808 $ 53,762 (a) International sales include foreign military sales contracted through the U.S. Government, direct commercial sales with international governments and commercial and other sales to international customers. 2017 Aeronautics MFC RMS Space Total Net sales Products $ 16,981 $ 5,940 $ 11,398 $ 8,183 $ 42,502 Services 2,429 1,342 2,265 1,422 7,458 Total net sales $ 19,410 $ 7,282 $ 13,663 $ 9,605 $ 49,960 Net sales by contract type Fixed-price $ 13,828 $ 5,102 $ 10,059 $ 2,058 $ 31,047 Cost-reimbursable 5,582 2,180 3,604 7,547 18,913 Total net sales $ 19,410 $ 7,282 $ 13,663 $ 9,605 $ 49,960 Net sales by customer U.S. Government $ 12,609 $ 4,467 $ 9,715 $ 8,088 $ 34,879 International (a) 6,641 2,672 3,575 1,446 14,334 U.S. commercial and other 160 143 373 71 747 Total net sales $ 19,410 $ 7,282 $ 13,663 $ 9,605 $ 49,960 Net sales by geographic region United States $ 12,769 $ 4,610 $ 10,088 $ 8,159 $ 35,626 Asia Pacific 2,823 516 1,344 92 4,775 Europe 2,331 305 927 1,270 4,833 Middle East 1,316 1,798 572 81 3,767 Other 171 53 732 3 959 Total net sales $ 19,410 $ 7,282 $ 13,663 $ 9,605 $ 49,960 (a) International sales include foreign military sales contracted through the U.S. Government, direct commercial sales with international governments and commercial and other sales to international customers. Total assets for each of our business segments were as follows (in millions): 2019 2018 Assets (a) Aeronautics $ 9,109 $ 8,435 Missiles and Fire Control 5,030 5,017 Rotary and Mission Systems 18,751 18,333 Space 5,844 5,445 Total business segment assets 38,734 37,230 Corporate assets (b) 8,794 7,646 Total assets $ 47,528 $ 44,876 (a) We have no long-lived assets with material carrying values located in foreign countries. (b) Corporate assets primarily include cash and cash equivalents, deferred income taxes, assets for the portion of environmental costs that are probable of future recovery and investments held in a separate trust.