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Special Charges and Mark-to-Market ("MTM") Adjustments (Tables) | 6 Months Ended
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Jun. 30, 2019
Other Income and Expenses [Abstract] |
Components of Special Charges | For the three and six months ended June 30, special charges and MTM adjustments consisted of the following (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
Operating: | 2019 |  | 2018 |  | 2019 |  | 2018
Impairment of assets | $ | 61 |  |  | $ | 111 |  |  | $ | 69 |  |  | $ | 134 |
Severance and benefit costs | 6 |  |  | 11 |  |  | 12 |  |  | 25 |
(Gains) losses on sale of assets and other special charges | 4 |  |  | 7 |  |  | 8 |  |  | 10 |
Total operating special charges | 71 |  |  | 129 |  |  | 89 |  |  | 169 |
Nonoperating MTM (gains) losses on financial instruments | (34 | ) |  | 135 |  |  | (51 | ) |  | 90 |
Total special charges and MTM (gains) losses on financial instruments | 37 |  |  | 264 |  |  | 38 |  |  | 259 |
Income tax benefit | (8 | ) |  | (59 | ) |  | (8 | ) |  | (58 | )
Total special charges and MTM (gains) losses on financial instruments, net of income tax | $ | 29 |  |  | $ | 205 |  |  | $ | 30 |  |  | $ | 201 |

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