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Special Charges and Unrealized (Gains) Losses on Investments - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating: |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets | $ 102 | $ 0 | $ 61 | $ 8 | $ 232 | $ 11 | $ 111 | $ 23 | $ 171 | $ 377 |  | $ 25 |
Severance and benefit costs | 2 | 2 | 6 | 6 | 7 | 9 | 11 | 14 | 16 | 41 |  | 116 |
Termination of an engine maintenance service agreement |  |  |  |  | 64 | 0 | 0 | 0 | 0 | 64 |  | 0 |
(Gains) losses on sale of assets and other special charges | 26 | 25 | 4 | 4 | (2) | (3) | 7 | 3 | 59 | 5 |  | 35 |
Total operating special charges | 130 | 27 | 71 | 18 | 301 | 17 | 129 | 40 | 246 | 487 | [1] | 176 | [1]
Nonoperating unrealized (gains) losses on investments | (81) | (21) | (34) | (17) | (56) | (29) | 135 | (45) | (153) | 5 |  | 0 |
Total special charges and unrealized (gains) losses on investments | 49 | 6 | 37 | 1 | 245 | (12) | 264 | (5) | 93 | 492 |  | 176 |
Income tax benefit | (11) | (2) | (8) | 0 | (55) | 3 | (59) | 1 | (21) | (110) |  | (63) |
Income tax adjustments |  |  |  |  | (5) | 0 | 0 | 0 | 0 | (5) |  | (189) |
Total operating special charges, net of income taxes and income tax adjustments | $ 38 | $ 4 | $ 29 | $ 1 | $ 185 | $ (9) | $ 205 | $ (4) | $ 72 | $ 377 |  | $ (76) |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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