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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 54,896 $ 45,353
Securities available for sale debt securities, unrealized gains 202 257
Securities available for sale debt securities, unrealized losses (3,910) (3,825)
Securities available for sale debt securities, fair value 51,188 41,785
Held to maturity securities, amortized cost 87,457 90,784
Held-to-maturity securities, unrealized gains 62 179
Held-to-maturity securities, unrealized losses (5,264) (4,015)
Held-to-maturity securities, fair value 82,255 86,948
Accrued interest, held-to-maturity 268 281
Accrued interest, available-for-sale 252 144
Debt securities, available for sale, amortized cost 88 86
Debt securities, held to maturity, amortized cost 5 6
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time $ 3,800 $ 4,200
Fitch, AAA OR AA Rating | Credit Concentration Risk | Investments    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Concentration risk, percentage 97.00% 97.00%
U.S. Treasury and government agencies    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost $ 16,868 $ 7,596
Securities available for sale debt securities, unrealized gains 19 22
Securities available for sale debt securities, unrealized losses (413) (667)
Securities available for sale debt securities, fair value 16,474 6,951
Held to maturity securities, amortized cost 35,468 36,529
Held-to-maturity securities, unrealized gains 9
Held-to-maturity securities, unrealized losses (1,302) (1,141)
Held-to-maturity securities, fair value 34,166 35,397
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 30,234 30,643
Securities available for sale debt securities, unrealized gains 15 46
Securities available for sale debt securities, unrealized losses (3,153) (2,809)
Securities available for sale debt securities, fair value 27,096 27,880
Held to maturity securities, amortized cost 41,865 42,686
Held-to-maturity securities, unrealized gains 13 92
Held-to-maturity securities, unrealized losses (3,805) (2,733)
Held-to-maturity securities, fair value 38,073 40,045
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 534 585
Securities available for sale debt securities, unrealized gains 99 118
Securities available for sale debt securities, unrealized losses (9) (7)
Securities available for sale debt securities, fair value 624 696
Held to maturity securities, amortized cost 250 259
Held-to-maturity securities, unrealized gains
Held-to-maturity securities, unrealized losses (23) (17)
Held-to-maturity securities, fair value 227 242
Agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 1,758 1,680
Securities available for sale debt securities, unrealized gains 1
Securities available for sale debt securities, unrealized losses (141) (135)
Securities available for sale debt securities, fair value 1,617 1,546
Held to maturity securities, amortized cost 956 939
Held-to-maturity securities, unrealized gains 2 9
Held-to-maturity securities, unrealized losses (31) (23)
Held-to-maturity securities, fair value 927 925
Non-agency    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 824 913
Securities available for sale debt securities, unrealized gains 1 1
Securities available for sale debt securities, unrealized losses (28) (45)
Securities available for sale debt securities, fair value 797 869
Held to maturity securities, amortized cost 1,189 1,373
Held-to-maturity securities, unrealized gains 2 2
Held-to-maturity securities, unrealized losses (17) (27)
Held-to-maturity securities, fair value 1,174 1,348
Asset-backed    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 2,097 1,092
Securities available for sale debt securities, unrealized gains 27 25
Securities available for sale debt securities, unrealized losses (4) (1)
Securities available for sale debt securities, fair value 2,120 1,116
Held to maturity securities, amortized cost 4,833 5,890
Held-to-maturity securities, unrealized gains 22 17
Held-to-maturity securities, unrealized losses (30) (39)
Held-to-maturity securities, fair value 4,825 5,868
Other    
Debt Securities, Available-for-sale and Held-to-maturity [Abstract]    
Securities available for sale debt securities, amortized cost 2,581 2,844
Securities available for sale debt securities, unrealized gains 41 44
Securities available for sale debt securities, unrealized losses (162) (161)
Securities available for sale debt securities, fair value 2,460 2,727
Held to maturity securities, amortized cost 2,896 3,108
Held-to-maturity securities, unrealized gains 23 50
Held-to-maturity securities, unrealized losses (56) (35)
Held-to-maturity securities, fair value $ 2,863 $ 3,123