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Equity, Income Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive loss before income tax expense (benefit) | $ (117) | $ (264) | $ (191) | $ (422)
Other Comprehensive Income (Loss), Tax |  |  |  |
Income tax expense (benefit) related to items of other comprehensive loss | 1 | 2 | (5) | 6
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive loss | (118) | (266) | (186) | (428)
Accumulated Foreign Currency Adjustment [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, before tax | (117) | (270) | (197) | (439)
Other Comprehensive Income (Loss), Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax | (117) | (270) | (197) | (439)
Accumulated Defined Benefit Plans Adjustment, Miscellaneous Gain Component [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, before tax |  |  | 0 | 0
Other Comprehensive Income (Loss), Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, tax expense (benefit) |  |  | (8) | 0
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, net of tax |  |  | 8 | 0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) Component [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, before tax | (9) | (10) | (27) | (30)
Other Comprehensive Income (Loss), Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | (3) | (3) | (10) | (10)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | (6) | (7) | (17) | (20)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Component [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, before tax | 12 | 16 | 36 | 47
Other Comprehensive Income (Loss), Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | 4 | 5 | 13 | 16
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | 8 | 11 | 23 | 31
Accumulated Defined Benefit Plans Adjustment, Curtailment and Settlement [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, before tax | (3) | 0 | (3) | 0
Other Comprehensive Income (Loss), Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | 0 | 0 | 0 | 0
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | (3) | 0 | (3) | 0
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive loss before income tax expense (benefit) | 0 | 6 | 6 | 17
Other Comprehensive Income (Loss), Tax |  |  |  |
Income tax expense (benefit) related to items of other comprehensive loss | 1 | 2 | (5) | 6
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive loss | $ (1) | $ 4 | $ 11 | $ 11

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