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Equity, Income Tax Effects on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive income (loss) before income tax expense (benefit) | $ (199) | $ 203 | $ (74) | $ (158)
Other Comprehensive Income (Loss), Tax |  |  |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | 1 | 2 | (6) | 4
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive income (loss) | (200) | 201 | (68) | (162)
Accumulated Foreign Currency Adjustment [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive income (loss), before reclassifications, before tax | (202) | 197 | (80) | (169)
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 | (202) | 197 | (80) | (169)
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 | 16 | 24 | 31
Other Comprehensive Income (Loss), Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | 5 | 6 | 9 | 11
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | 7 | 10 | 15 | 20
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) | (18) | (20)
Other Comprehensive Income (Loss), Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, tax expense (benefit) | (4) | (4) | (7) | (7)
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Reclassification from accumulated other comprehensive income (loss), current period, net of tax | (5) | (6) | (11) | (13)
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Other Comprehensive Income (Loss), Before Tax |  |  |  |
Other comprehensive income (loss) before income tax expense (benefit) | 3 | 6 | 6 | 11
Other Comprehensive Income (Loss), Tax |  |  |  |
Income tax expense (benefit) related to items of other comprehensive income (loss) | 1 | 2 | (6) | 4
Other Comprehensive Income (Loss), Net of Tax |  |  |  |
Other comprehensive income (loss) | $ 2 | $ 4 | $ 12 | $ 7

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