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Accumulated Other Comprehensive Income Loss - AOCI Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 18,556  
Other comprehensive income (loss), net of tax $ 306 $ 1,436 (600) $ 427
Ending balance 18,244 17,072 18,244 17,072
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 1,909 627 2,834 1,684
OCI before reclassifications 337 1,469 (585) 454
Amounts reclassified from AOCI (42) (41) (45) (83)
Other comprehensive income (loss), net of tax 295 1,428 (630) 371
Ending balance 2,204 2,055 2,204 2,055
AOCI, Gain (Loss), Debt Securities, Available-for-sale, with Allowance for Credit Loss, Parent        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (2) (2) (2) (3)
OCI before reclassifications 0 0 0 1
Amounts reclassified from AOCI 0 0 0 0
Other comprehensive income (loss), net of tax 0 0 0 1
Ending balance (2) (2) (2) (2)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 17 53 12 9
OCI before reclassifications 1 0 13 47
Amounts reclassified from AOCI (6) (5) (13) (8)
Other comprehensive income (loss), net of tax (5) (5) 0 39
Ending balance 12 48 12 48
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 44 26 43 34
OCI before reclassifications 2 1 3 (7)
Amounts reclassified from AOCI 0 0 0 0
Other comprehensive income (loss), net of tax 2 1 3 (7)
Ending balance 46 27 46 27
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance (1,704) (1,661) (1,717) (1,672)
OCI before reclassifications (1) 0 (1) (1)
Amounts reclassified from AOCI 15 12 28 24
Other comprehensive income (loss), net of tax 14 12 27 23
Ending balance (1,690) (1,649) (1,690) (1,649)
AOCI Attributable to Parent [Member]        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance 264 (957) 1,170 52
OCI before reclassifications 339 1,470 (570) 494
Amounts reclassified from AOCI (33) (34) (30) (67)
Other comprehensive income (loss), net of tax 306 1,436 (600) 427
Ending balance $ 570 $ 479 $ 570 $ 479