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Changes in Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Abstract] |
Accumulated other comprehensive income (loss) |
| Post-Retirement Benefits, Net of Tax |  | Hedge Instruments, Net of Tax |  | Translation Adjustments and Other, Net of Tax |  | Total
| (in millions)
Balance, December 31, 2017 | $ | (564 | ) |  | $ | (23 | ) |  | $ | (824 | ) |  | $ | (1,411 | )
Other comprehensive income (loss) before reclassifications, net of tax | 2 |  |  | (1 | ) |  | (75 | ) |  | (74 | )
Reclassifications from accumulated other comprehensive loss to earnings | 15 |  |  | (1 | ) |  | — |  |  | 14 |
Other comprehensive income (loss), net of tax | 17 |  |  | (2 | ) |  | (75 | ) |  | (60 | )
Balance, June 30, 2018 | $ | (547 | ) |  | $ | (25 | ) |  | $ | (899 | ) |  | $ | (1,471 | )

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- Definition Accumulated Other Comprehensive Income (Loss) [Abstract] + References No definition available. + Details
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- Definition Schedule of changes in accumulated other comprehensive income [Table Text Block] + References No definition available. + Details
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