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Selected Quarterly Financial Data (Unaudited) - Impact of Significant Items on Quarterly Results (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating: |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets | $ 232 | $ 11 | $ 111 | $ 23 | $ 10 | $ 15 | $ 0 | $ 0 | $ 377 | $ 25 |  | $ 412 |
Termination of an engine maintenance service agreement | 64 | 0 | 0 | 0 |  |  |  |  | 64 | 0 |  | 0 |
Severance and benefit costs | 7 | 9 | 11 | 14 | 15 | 23 | 41 | 37 | 41 | 116 |  | 37 |
(Gains) losses on sale of assets and other special charges | (2) | (3) | 7 | 3 | 6 | 12 | 3 | 14 | 5 | 35 |  | 51 |
Total operating special charges | 301 | 17 | 129 | 40 | 31 | 50 | 44 | 51 | 487 | 176 | [1] | 745 | [1]
Nonoperating income (expense): |  |  |  |  |  |  |  |  |  |  |  |  |
Nonoperating mark-to-market (MTM) (gains) losses on financial instruments | (56) | (29) | 135 | (45) |  |  |  |  | 5 | 0 |  | 0 |
Total special charges and MTM (gains) losses on financial instruments | 245 | (12) | 264 | (5) |  |  |  |  | 492 | 176 |  | 637 |
Income taxes: |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefit related to special charges | (55) | 3 | (59) | 1 | (11) | (18) | (16) | (18) | (110) | (63) |  | (229) |
Income tax adjustments | (5) | 0 | 0 | 0 | (179) | 0 | 0 | 0 | (5) | (179) |  | 180 |
Total operating special charges, net of income taxes and income tax adjustments | $ 185 | $ (9) | $ 205 | $ (4) | $ (159) | $ 32 | $ 28 | $ 33 | $ 377 | $ (66) |  | $ 588 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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