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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 45,338  
Other comprehensive income, net of tax $ 737 $ 315 147 $ 742
Other comprehensive (loss) attributable to redeemable noncontrolling interest (2) (2) (6) (4)
Shareholders' other comprehensive income (loss) 739 317 153 746
Ending balance 47,366   47,366  
Securities and Derivatives        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 547 460 975 18
Other comprehensive income (loss) before reclassifications, before tax 920 442 340 1,007
Other comprehensive income (loss) before reclassifications, tax (197) (94) (69) (216)
Other comprehensive income (loss) before reclassifications, after-tax 723 348 271 791
Reclassification adjustment, before tax (19) (6) 13 (7)
Reclassification adjustment, tax 5 1 (3) 1
Net amounts reclassified from AOCI to net income (14) (5) 10 (6)
Shareholders' other comprehensive income (loss) 709 343 281 785
Ending balance 1,256 803 1,256 803
Translation of foreign currencies        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (446) (245) (275) (221)
Other comprehensive income (loss), before reclassifications, before tax, including temporary equity 65 (42) (95) (67)
Other comprehensive income (loss) before reclassifications, tax, including temporary equity 5 0 (10) (1)
Other comprehensive income, net of tax 70 (42) (105) (68)
Other comprehensive (loss) attributable to redeemable noncontrolling interest (2) (2) (6) (4)
Shareholders' other comprehensive income (loss) 72 (40) (99) (64)
Ending balance (374) (285) (374) (285)
Postretirement benefits liability        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (1,628) (1,497) (1,641) (1,508)
Other comprehensive income (loss) before reclassifications, before tax (73) (8) (73) (8)
Other comprehensive income (loss) before reclassifications, tax 17 1 17 1
Other comprehensive income (loss) before reclassifications, after-tax (56) (7) (56) (7)
Reclassification adjustment, tax (4) 5 (9) (9)
Net amounts reclassified from AOCI to net income 14 21 27 32
Shareholders' other comprehensive income (loss) (42) 14 (29) 25
Ending balance (1,670) (1,483) (1,670) (1,483)
Reclassification adjustment for amortization of net losses from past experience and prior service costs (interest expense and other)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustment, before tax 18 16 36 31
Reclassification adjustment for settlement (interest expense and other)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Reclassification adjustment, before tax $ 0 $ 0 $ 0 $ 10