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Special Charges and Mark-to-Market ("MTM") Adjustments - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Other Income and Expenses [Abstract] |  |  |  |  |  |
Severance and benefit costs | $ 2 | $ 9 |  | $ 14 | $ 34 |
Impairment of assets | 0 | 11 |  | 69 | 145 |
(Gains) losses on sale of assets and other special charges | 25 | (3) |  | 33 | 7 |
Total operating special charges | 27 | 17 | [1] | 116 | 186 | [1]
Nonoperating MTM (gains) losses on financial instruments | (21) | (29) |  | (72) | 61 |
Total special charges and MTM (gains) losses on financial instruments | 6 | (12) |  | 44 | 247 |
Income tax expense (benefit) | (2) | 3 |  | (10) | (55) |
Total special charges and MTM (gains) losses on financial instruments, net of income tax | $ 4 | $ (9) |  | $ 34 | $ 192 |
[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 I, Item 1 of this report for additional information.

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