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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Statements Of Comprehensive Income [Abstract]      
Foreign currency translation adjustments, attributable to noncontrolling interest, net of taxes $ 20 $ (16) $ 0
Foreign currency translation adjustments, tax effect 357 (595) (45)
Reclassification adjustment in net income on currency translation adjustments - tax effect 0 0 224
Unrealized gains (losses) on available-for-sale securities, tax effect 36 0 40
Reclassification adjustment realized in net income on available-for-sale securities, tax effect (1) (9) (10)
Unrealized gains (losses) on cash flow hedges, tax effect 371 (411) 140
Reclassification adjustment included in net income on cash flow hedges, tax effect 21 20 18
Net prior service credit (cost) arising during period - tax effect 305 27 262
Amortization of net prior service cost (credit) included in net income, tax effect (525) (523) (588)
Reclassification adjustment in net income on defined benefit postretirement plans- tax effect $ 0 $ 0 $ 11