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Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance $ 25,404 $ 26,001
Other comprehensive income (loss) before reclassification adjustments, pretax (35) (152)
Tax (127) (43)
Other comprehensive income (loss) before reclassification adjustments, net of taxes (162) (195)
Reclassification adjustments, pretax 198 1
Tax (24) (4)
Reclassification adjustments, net of taxes 174 (3)
Other comprehensive income (loss), net of taxes 12 (198)
Equity, ending balance 27,039 26,300
Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (266) 31
Other comprehensive income (loss) before reclassification adjustments, pretax 180 178
Tax (38) (37)
Other comprehensive income (loss) before reclassification adjustments, net of taxes 142 141
Reclassification adjustments, pretax 111 (47)
Tax (23) 10
Reclassification adjustments, net of taxes 88 (37)
Other comprehensive income (loss), net of taxes 230 104
Equity, ending balance (36) 135
Investments    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance 0 18
Other comprehensive income (loss) before reclassification adjustments, pretax 0 3
Tax 0 0
Other comprehensive income (loss) before reclassification adjustments, net of taxes 0 3
Reclassification adjustments, pretax 0 (21)
Tax 0 0
Reclassification adjustments, net of taxes 0 (21)
Other comprehensive income (loss), net of taxes 0 (18)
Equity, ending balance 0 0
Employee Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (4,540) (4,261)
Other comprehensive income (loss) before reclassification adjustments, pretax (4) 0
Tax (1) 5
Other comprehensive income (loss) before reclassification adjustments, net of taxes (5) 5
Reclassification adjustments, pretax 87 69
Tax (1) (14)
Reclassification adjustments, net of taxes 86 55
Other comprehensive income (loss), net of taxes 81 60
Equity, ending balance (4,459) (4,201)
Cumulative Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (1,828) (1,981)
Other comprehensive income (loss) before reclassification adjustments, pretax (211) (333)
Tax (88) (11)
Other comprehensive income (loss) before reclassification adjustments, net of taxes (299) (344)
Reclassification adjustments, pretax 0 0
Tax 0 0
Reclassification adjustments, net of taxes 0 0
Other comprehensive income (loss), net of taxes (299) (344)
Equity, ending balance (2,127) (2,325)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Equity, beginning balance (6,634) (6,193)
Equity, ending balance $ (6,622) $ (6,391)