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Special Charges and Mark-to-Market ("MTM") Adjustments (Tables) | 9 Months Ended
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Sep. 30, 2019
Other Income and Expenses [Abstract] |
Components of Special Charges | For the three and nine months ended September 30, special charges and MTM adjustments consisted of the following (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Severance and benefit costs | $ | 2 |  |  | $ | 9 |  |  | $ | 14 |  |  | $ | 34 |
Impairment of assets | — |  |  | 11 |  |  | 69 |  |  | 145 |
(Gains) losses on sale of assets and other special charges | 25 |  |  | (3 | ) |  | 33 |  |  | 7 |
Total operating special charges | 27 |  |  | 17 |  |  | 116 |  |  | 186 |
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 |

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