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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 17,981  
Other comprehensive income before reclassification, net of income taxes (571) $ 810
Amounts reclassified from AOCI, net of income taxes (64) (22)
Total other comprehensive income (loss), net of tax (635) 788
Ending Balance 17,634  
Unrealized gains (losses) on securities available for sale    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 567 115
Other comprehensive income before reclassification, net of income taxes (628) 408
Amounts reclassified from AOCI, net of income taxes 0 (3)
Total other comprehensive income (loss), net of tax (628) 405
Ending Balance (61) 520
Unrealized gains (losses) on derivative financial instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 476 250
Other comprehensive income before reclassification, net of income taxes 58 402
Amounts reclassified from AOCI, net of income taxes (68) (25)
Total other comprehensive income (loss), net of tax (10) 377
Ending Balance 466 627
Foreign currency translation adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 0 0
Other comprehensive income before reclassification, net of income taxes 0 0
Amounts reclassified from AOCI, net of income taxes 0 0
Total other comprehensive income (loss), net of tax 0 0
Ending Balance 0 0
Net pension and postretirement benefit costs    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (305) (339)
Other comprehensive income before reclassification, net of income taxes (1) 0
Amounts reclassified from AOCI, net of income taxes 4 6
Total other comprehensive income (loss), net of tax 3 6
Ending Balance (302) (333)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 738 26
Total other comprehensive income (loss), net of tax (635) 788
Ending Balance $ 103 $ 814