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Equity, Income Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Other Comprehensive Income (Loss), before Tax |  |
Other comprehensive income (loss) before income tax expense (benefit) | $ 125 | $ (361)
Other Comprehensive Income (Loss), Tax |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | (7) | 2
Other Comprehensive Income (Loss), Net of Tax |  |
Other comprehensive income (loss) | 132 | (363)
Accumulated Foreign Currency Adjustment [Member] |  |
Other Comprehensive Income (Loss), before Tax |  |
Other comprehensive income (loss), before reclassifications, before tax | 122 | (366)
Other Comprehensive Income (Loss), Tax |  |
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 0 | 0
Other Comprehensive Income (Loss), Net of Tax |  |
Other comprehensive income (loss), before reclassifications, net of tax | 122 | (366)
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 Gain (Loss) Component [Member] |  |
Other Comprehensive Income (Loss), before Tax |  |
Reclassification from accumulated other comprehensive income (loss), current period, before tax | 12 | 15
Other Comprehensive Income (Loss), Tax |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | 4 | 5
Other Comprehensive Income (Loss), Net of Tax |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | 8 | 10
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)
Other Comprehensive Income (Loss), Tax |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | (3) | (3)
Other Comprehensive Income (Loss), Net of Tax |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | (6) | (7)
Accumulated Defined Benefit Plans Adjustment [Member] |  |
Other Comprehensive Income (Loss), before Tax |  |
Other comprehensive income (loss) before income tax expense (benefit) | 3 | 5
Other Comprehensive Income (Loss), Tax |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | (7) | 2
Other Comprehensive Income (Loss), Net of Tax |  |
Other comprehensive income (loss) | $ 10 | $ 3

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