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Other Comprehensive Income (Loss) - Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance     $ 40,308 $ 44,767
Other comprehensive income (loss), net of taxes $ (14) $ 108 132 62
Equity, ending balance 39,712 43,446 39,712 43,446
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance 106 202 338 404
Other comprehensive income (loss) before reclassification adjustments, pretax (169) (75) (432) (242)
Tax 59 27 151 85
Other comprehensive income (loss) before reclassification adjustments, net of taxes (110) (48) (281) (157)
Reclassification adjustments, pretax (50) (66) (145) (209)
Tax 17 23 51 73
Reclassification adjustments, net of taxes (33) (43) (94) (136)
Other comprehensive income (loss), net of taxes (143) (91) (375) (293)
Equity, ending balance (37) 111 (37) 111
Investments        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance 40 104 (3) 41
Other comprehensive income (loss) before reclassification adjustments, pretax 26 76 113 130
Tax 3 (5) (4) 11
Other comprehensive income (loss) before reclassification adjustments, net of taxes 29 71 109 141
Reclassification adjustments, pretax 8 (10) (49) (21)
Tax (2) 2 18 6
Reclassification adjustments, net of taxes 6 (8) (31) (15)
Other comprehensive income (loss), net of taxes 35 63 78 126
Equity, ending balance 75 167 75 167
Employee Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance (3,180) (2,435) (3,206) (2,407)
Other comprehensive income (loss) before reclassification adjustments, pretax 29 (183) 25 (218)
Tax (3) 68 6 67
Other comprehensive income (loss) before reclassification adjustments, net of taxes 26 (115) 31 (151)
Reclassification adjustments, pretax 27 7 55 14
Tax (6) 0 (13) 1
Reclassification adjustments, net of taxes 21 7 42 15
Other comprehensive income (loss), net of taxes 47 (108) 73 (136)
Equity, ending balance (3,133) (2,543) (3,133) (2,543)
Cumulative Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance (2,046) (2,065) (2,355) (2,186)
Other comprehensive income (loss) before reclassification adjustments, pretax (25) 255 238 354
Tax 72 (11) 118 11
Other comprehensive income (loss) before reclassification adjustments, net of taxes 47 244 356 365
Reclassification adjustments, pretax 0 0 0 0
Tax 0 0 0 0
Reclassification adjustments, net of taxes 0 0 0 0
Other comprehensive income (loss), net of taxes 47 244 356 365
Equity, ending balance (1,999) (1,821) (1,999) (1,821)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Equity, beginning balance (5,080) (4,194) (5,226) (4,148)
Other comprehensive income (loss) before reclassification adjustments, pretax (139) 73 (56) 24
Tax 131 79 271 174
Other comprehensive income (loss) before reclassification adjustments, net of taxes (8) 152 215 198
Reclassification adjustments, pretax (15) (69) (139) (216)
Tax 9 25 56 80
Reclassification adjustments, net of taxes (6) (44) (83) (136)
Other comprehensive income (loss), net of taxes (14) 108 132 62
Equity, ending balance $ (5,094) $ (4,086) $ (5,094) $ (4,086)