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Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance $ 40,308 $ 44,767
Other comprehensive income (loss), net of taxes 146 (46)
Equity, ending balance 40,088 43,901
Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance 338 404
Other comprehensive income (loss) before reclassification adjustments, pretax (263) (167)
Tax 92 58
Other comprehensive income (loss) before reclassification adjustments, net of taxes (171) (109)
Reclassification adjustments, pretax (95) (143)
Tax 34 50
Reclassification adjustments, net of taxes (61) (93)
Other comprehensive income (loss), net of taxes (232) (202)
Equity, ending balance 106 202
Investments    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (3) 41
Other comprehensive income (loss) before reclassification adjustments, pretax 87 54
Tax (7) 16
Other comprehensive income (loss) before reclassification adjustments, net of taxes 80 70
Reclassification adjustments, pretax (57) (11)
Tax 20 4
Reclassification adjustments, net of taxes (37) (7)
Other comprehensive income (loss), net of taxes 43 63
Equity, ending balance 40 104
Employee Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (3,206) (2,407)
Other comprehensive income (loss) before reclassification adjustments, pretax (4) (35)
Tax 9 (1)
Other comprehensive income (loss) before reclassification adjustments, net of taxes 5 (36)
Reclassification adjustments, pretax 28 7
Tax (7) 1
Reclassification adjustments, net of taxes 21 8
Other comprehensive income (loss), net of taxes 26 (28)
Equity, ending balance (3,180) (2,435)
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (2,355) (2,186)
Other comprehensive income (loss) before reclassification adjustments, pretax 263 99
Tax 46 22
Other comprehensive income (loss) before reclassification adjustments, net of taxes 309 121
Reclassification adjustments, pretax 0 0
Tax 0 0
Reclassification adjustments, net of taxes 0 0
Other comprehensive income (loss), net of taxes 309 121
Equity, ending balance (2,046) (2,065)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (5,226) (4,148)
Other comprehensive income (loss) before reclassification adjustments, pretax 83 (49)
Tax 140 95
Other comprehensive income (loss) before reclassification adjustments, net of taxes 223 46
Reclassification adjustments, pretax (124) (147)
Tax 47 55
Reclassification adjustments, net of taxes (77) (92)
Other comprehensive income (loss), net of taxes 146 (46)
Equity, ending balance $ (5,080) $ (4,194)