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Special Charges and Mark-to-Market Adjustments - Components of Special Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Other Income and Expenses [Abstract] |  |  |  |  |  |
Impairment of assets | $ 11 | $ 15 |  | $ 145 | $ 15 |
Severance and benefit costs | 9 | 23 |  | 34 | 101 |
(Gains) losses on sale of assets and other special charges | (3) | 12 |  | 7 | 29 |
Total special charges | 17 | 50 | [1] | 186 | 145 | [1]
Nonoperating mark-to-market (MTM) (gains) losses on equity investments | (29) | 0 |  | 61 | 0 |
Total special charges and MTM (gains) losses on equity investments | (12) | 50 |  | 247 | 145 |
Income tax expense (benefit) | 3 | (18) |  | (55) | (52) |
Total special charges and MTM (gains) losses on equity investments, net of tax | $ (9) | $ 32 |  | $ 192 | $ 93 |
[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 I, Item 1 of this report for additional information.

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