Financial data for business segments and products and services for the years ended December 31, 2019 , 2018 , and 2017 was as follows: Electric Utilities Traditional Electric Operating Companies Southern Power Eliminations Total Southern Company Gas All Other Eliminations Consolidated (in millions) 2019 Operating revenues $ 15,569 $ 1,938 $ (412 ) $ 17,095 $ 3,792 $ 690 $ (158 ) $ 21,419 Depreciation and amortization 1,993 479  2,472 487 79  3,038 Interest income 38 9  47 3 16 (6 ) 60 Earnings from equity method investments 2 3  5 157   162 Interest expense 818 169  987 232 517  1,736 Income taxes (benefit) 764 (56 )  708 130 960  1,798 Segment net income (loss) (a)(b)(c)(d)(e) 2,929 339  3,268 585 908 (22 ) 4,739 Goodwill  2  2 5,015 263  5,280 Total assets 81,063 14,300 (713 ) 94,650 21,687 3,511 (1,148 ) 118,700 Gross property additions 5,748 489  6,237 1,418 159  7,814 2018 Operating revenues $ 16,843 $ 2,205 $ (477 ) $ 18,571 $ 3,909 $ 1,213 $ (198 ) $ 23,495 Depreciation and amortization 2,072 493  2,565 500 66  3,131 Interest income 23 8  31 4 8 (5 ) 38 Earnings from equity method investments (1 )   (1 ) 148 2 (1 ) 148 Interest expense 852 183  1,035 228 580 (1 ) 1,842 Income taxes (benefit) 371 (164 )  207 464 (222 )  449 Segment net income (loss) (a)(b)(f)(g) 2,117 187  2,304 372 (453 ) 3 2,226 Goodwill  2  2 5,015 298  5,315 Total assets 79,382 14,883 (306 ) 93,959 21,448 3,285 (1,778 ) 116,914 Gross property additions 6,077 315  6,392 1,399 414  8,205 2017 Operating revenues $ 16,884 $ 2,075 $ (419 ) $ 18,540 $ 3,920 $ 741 $ (170 ) $ 23,031 Depreciation and amortization 1,954 503  2,457 501 52  3,010 Interest income 14 7  21 3 11 (9 ) 26 Earnings from equity method investments 1   1 106 (1 )  106 Interest expense 820 191  1,011 200 490 (7 ) 1,694 Income taxes (benefit) 1,021 (939 )  82 367 (307 )  142 Segment net income (loss) (a)(b)(h)(i) (193 ) 1,071  878 243 (279 )  842 Goodwill  2  2 5,967 299  6,268 Total assets 72,204 15,206 (325 ) 87,085 22,987 2,552 (1,619 ) 111,005 Gross property additions 3,836 268  4,104 1,525 355  5,984 (a) Attributable to Southern Company. (b) Segment net income (loss) for the traditional electric operating companies includes pre-tax charges for estimated losses on plants under construction of $24 million ( $24 million after tax) in 2019 , $1.1 billion ( $722 million after tax) in 2018 , and $3.4 billion ( $2.4 billion after tax) in 2017 . See Note 2 under " Georgia Power  Nuclear Construction " and " Mississippi Power  Kemper County Energy Facility  Schedule and Cost Estimate " for additional information. (c) Segment net income (loss) for Southern Power includes a $23 million pre-tax gain ( $88 million gain after tax) on the sale of Plant Nacogdoches in 2019. See Note 15 under "Southern Power" for additional information. (d) Segment net income (loss) for Southern Company Gas in 2019 includes pre-tax impairment charges totaling $115 million ( $86 million after tax). See Notes 3 and 15 under " Other Matters  Southern Company Gas " and " Southern Company Gas  Proposed Sale of Pivotal LNG and Atlantic Coast Pipeline ," respectively, for additional information. (e) Segment net income (loss) for the "All Other" column in 2019 includes the pre-tax gain associated with the sale of Gulf Power of $2.6 billion ( $1.4 billion after tax), the pre-tax loss, including related impairment charges, on the sales of certain PowerSecure business units totaling $58 million ( $52 million after tax), and a pre-tax impairment charge of $17 million ( $13 million after tax) related to a leveraged lease investment. See Notes 3 and 15 under " Other Matters  Southern Company " and " Southern Company ," respectively, for additional information. (f) Segment net income (loss) for Southern Power includes pre-tax impairment charges of $156 million ( $117 million after tax) in 2018. See Note 15 under " Southern Power " for additional information. (g) Segment net income (loss) for Southern Company Gas includes a net gain on dispositions of $291 million ( $51 million loss after tax) in 2018 related to the Southern Company Gas Dispositions and a goodwill impairment charge of $42 million in 2018 related to the sale of Pivotal Home Solutions. See Note 15 under " Southern Company Gas " for additional information. (h) Segment net income (loss) for the traditional electric operating companies includes a pre-tax charge for the write-down of Gulf Power's ownership of Plant Scherer Unit 3 of $33 million ( $20 million after tax) in 2017. See Note 2 under " Southern Company  Gulf Power " for additional information. (i) Segment net income (loss) includes income tax expense of $367 million for the traditional electric operating companies, income tax benefit of $743 million for Southern Power, and income tax expense of $93 million for Southern Company Gas in 2017 related to the Tax Reform Legislation. Financial data for business segments for the years ended December 31, 2019 , 2018 , and 2017 was as follows: Gas Distribution Operations (a)(b) Gas Pipeline Investments Wholesale Gas Services (c) Gas Marketing Services (b)(d) Total All Other (e) Eliminations Consolidated (in millions) 2019 Operating revenues $ 3,028 $ 32 $ 294 $ 456 $ 3,810 $ 44 $ (62 ) $ 3,792 Depreciation and amortization 422 5 1 26 454 33  487 Operating income (loss) 573 20 219 112 924 (154 )  770 Earnings from equity method investments  162   162 (5 )  157 Interest expense (187 ) (30 ) (5 ) (3 ) (225 ) (7 )  (232 ) Income taxes (benefit) 63 58 52 27 200 (70 )  130 Segment net income (loss) 337 94 163 83 677 (92 )  585 Gross property additions 1,433 1 1 4 1,439 27  1,466 Total assets at December 31, 2019 18,204 1,678 850 1,496 22,228 10,759 (11,300 ) 21,687 2018 Operating revenues $ 3,186 $ 32 $ 144 $ 568 $ 3,930 $ 55 $ (76 ) $ 3,909 Depreciation and amortization 409 5 2 37 453 47  500 Operating income (loss) 904 20 70 19 1,013 (98 )  915 Earnings from equity method investments  145   145 3  148 Interest expense (178 ) (34 ) (9 ) (6 ) (227 ) (1 )  (228 ) Income taxes (benefit) 409 28 4 54 495 (31 )  464 Segment net income (loss) 334 103 38 (40 ) 435 (63 )  372 Gross property additions 1,429 32  6 1,467 54  1,521 Total assets at December 31, 2018 17,266 1,763 1,302 1,587 21,918 11,112 (11,582 ) 21,448 2017 Operating revenues $ 3,207 $ 17 $ 6 $ 860 $ 4,090 $ 64 $ (234 ) $ 3,920 Depreciation and amortization 391 2 2 62 457 44  501 Operating income (loss) 645 10 (51 ) 113 717 (57 )  660 Earnings from equity method investments  103   103 3  106 Interest expense (153 ) (26 ) (7 ) (5 ) (191 ) (9 )  (200 ) Income taxes (f) 178 109  24 311 56  367 Segment net income (loss) (f) 353 (22 ) (57 ) 84 358 (115 )  243 Gross property additions 1,330 117 1 9 1,457 51  1,508 Total assets at December 31, 2017 19,358 1,699 1,096 2,147 24,300 12,726 (14,039 ) 22,987 (a) Operating revenues for the three gas distribution operations dispositions were $244 million and $399 million for 2018 and 2017, respectively. See Note 15 under " Southern Company Gas " for additional information. (b) Segment net income for gas distribution operations includes a gain on dispositions of $324 million ( $16 million after tax) in 2018. Segment net income for gas marketing services includes a loss on disposition of $(33) million ( $(67) million loss after tax) and a goodwill impairment charge of $42 million in 2018 recorded in contemplation of the sale of Pivotal Home Solutions. See Note 15 under " Southern Company Gas " for additional information. (c) The revenues for wholesale gas services are netted with costs associated with its energy and risk management activities. A reconciliation of operating revenues and intercompany revenues is shown in the following table. Third Party Gross Revenues Intercompany Revenues Total Gross Revenues Less Gross Gas Costs Operating Revenues (in millions) 2019 $ 5,703 $ 275 $ 5,978 $ 5,684 $ 294 2018 6,955 451 7,406 7,262 144 2017 6,152 481 6,633 6,627 6 (d) Operating revenues for the gas marketing services disposition were $55 million and $129 million in 2018 and 2017, respectively. See Note 15 under " Southern Company Gas " for additional information. (e) Segment net income (loss) for the "All Other" column in 2019 includes pre-tax impairment charges totaling $115 million ( $86 million after tax). See Notes 3 and 15 under " Other Matters  Southern Company Gas " and " Southern Company Gas  Proposed Sale of Pivotal LNG and Atlantic Coast Pipeline ," respectively, for additional information. (f) Includes the impact of the Tax Reform Legislation and new income tax apportionment factors in several states resulting from Southern Company Gas' inclusion in the consolidated Southern Company state tax filings.