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Accumulated Other Comprehensive Income - Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 14,427 $ 17,941 $ 17,423 $ 17,981
Other comprehensive income before reclassification, net of income taxes (2,144) (145) (5,662) (608)
Amounts reclassified from AOCI, net of income taxes 53 (50) (9) (175)
Total other comprehensive income (loss), net of tax (2,091) (195) (5,671) (783)
Ending balance 13,290 17,510 13,290 17,510
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (4,166) 150 (586) 738
Total other comprehensive income (loss), net of tax (2,091) (195) (5,671) (783)
Ending balance (6,257) (45) (6,257) (45)
Unrealized gains (losses) on securities available for sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3,167) 124 (403) 567
Other comprehensive income before reclassification, net of income taxes (1,616) (174) (4,380) (617)
Amounts reclassified from AOCI, net of income taxes 0 0 0 0
Total other comprehensive income (loss), net of tax (1,616) (174) (4,380) (617)
Ending balance (4,783) (50) (4,783) (50)
Unrealized gains (losses) on derivative financial instruments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (733) 325 88 476
Other comprehensive income before reclassification, net of income taxes (527) 30 (1,281) 11
Amounts reclassified from AOCI, net of income taxes 50 (59) (17) (191)
Total other comprehensive income (loss), net of tax (477) (29) (1,298) (180)
Ending balance (1,210) 296 (1,210) 296
Net pension and postretirement benefit costs        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (266) (299) (271) (305)
Other comprehensive income before reclassification, net of income taxes (1) (1) (1) (2)
Amounts reclassified from AOCI, net of income taxes 3 9 8 16
Total other comprehensive income (loss), net of tax 2 8 7 14
Ending balance $ (264) $ (291) $ (264) $ (291)