Operating Information by Segment Year ended December 31, 2019 2018 2017 (In millions) Revenues: NCSA $ 4,627 $ 3,928 $ 246 EARC 761 271 19 MENA 1,790 1,704 2,120 APAC 666 411 600 Technology 587 391 - Total revenues $ 8,431 $ 6,705 $ 2,985 Operating (loss) income: Segment operating (loss) income: NCSA $ (1,546 ) $ (1,537 ) $ (4 ) EARC (319 ) (74 ) (13 ) MENA 181 328 451 APAC 1 56 93 Technology 156 (519 ) - Total segment operating (loss) income (1,527 ) (1,746 ) 527 Corporate (1) (555 ) (510 ) (220 ) Total operating (loss) income $ (2,082 ) $ (2,256 ) $ 307 Goodwill impairment (2) : NCSA $ 1,111 $ 1,484 $ - EARC 319 40 - APAC - 52 - Technology - 592 - Total goodwill impairment $ 1,430 $ 2,168 $ - Depreciation and amortization: NCSA $ 65 $ 59 $ 26 EARC 14 13 - MENA 50 51 31 APAC 15 19 36 Technology 74 92 - Corporate 49 45 8 Total depreciation and amortization $ 267 $ 279 $ 101 Capital expenditures (3) : NCSA $ 7 $ 5 $ 23 EARC 2 - - MENA 18 19 31 APAC 8 12 9 Technology 2 - - Corporate (4) 55 50 56 Total Capital expenditures $ 92 $ 86 $ 119 Income (loss) from investments in unconsolidated affiliates: NCSA $ 1 $ - $ (1 ) EARC (5 ) (5 ) (4 ) MENA 12 5 - APAC 4 (8 ) (7 ) Technology 27 27 - Corporate (5 ) (6 ) - Total income (loss) from investments in unconsolidated affiliates: $ 34 $ 13 $ (12 ) December 31, 2019 2018 (In millions) Segment assets: NCSA $ 1,826 $ 3,257 EARC 554 1,169 MENA 1,317 1,472 APAC 1,518 1,147 Technology 2,590 2,752 Corporate (5) 932 (357 ) Total assets $ 8,737 $ 9,440 Investments in unconsolidated affiliates (6) : EARC $ 1 $ 2 MENA 70 60 APAC 3 - Technology 381 385 Corporate - 5 Total investments in unconsolidated affiliates $ 455 $ 452 (1) Corporate operating results include: 2019  $57 million in transaction costs (see Note 12, Restructuring and Integrations Costs and Transaction Costs ) ;  $114 million in restructuring and integration costs (see Note 12, Restructuring and Integrations Costs and Transaction Costs) ; and  $18 million of impairment charges associated with our marine vessels (see Note 16, Fair Value Measurements). 2018  $48 million in transaction costs associated with the Combination ;  $134 million in restructuring and integration costs;  $58 million of vessel related impairment charges; and  $25 million of expense associated with the need to make alternate arrangements for a third-party vessel charter, because the previously designated vessel was withdrawn from the market. 2017  $4 million gain on sale of assets; and  $9 million in transaction costs associated with the Combination (see Note 3, Business Combination). (2) Represents impairment of goodwill associated with our NCSA and EARC reporting units in 2019 and our NCSA, EARC, APAC and Technology reporting units in 2018. See Note 9, Goodwill and Other Intangible Assets , for further discussion. The goodwill impairment values are included within the applicable operating groups Operating loss. (3) Capital expenditures reported represent cash purchases. At December 31, 2019, 2018 and 2017, we had approximately $160 million, $26 million and $8 million, respectively, of accrued and unpaid capital expenditures reported in PP&amp;E and accrued liabilities. (4) Corporate capital expenditures in 2019 and 2018 include upgrades to the Amazon . Corporate capital expenditures in 2017 include the purchase of the Amazon , a pipelay and construction vessel described in Note 14, Lease Obligations . Following the purchase, we sold this vessel to an unrelated third party and simultaneously entered into an 11-year bareboat charter agreement . (5) Corporate assets at December 31, 2018 include negative cash balances associated with our international cash pooling program, which ceased in the fourth quarter of 2019. (6) The Consolidated Balance Sheets as of December 31, 2019 and 2018 include approximately $48 million and $15 million of accounts receivable, respectively, from our unconsolidated affiliates.