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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Securities Available for Sale    
Total $ 62,650 $ 45,353
Unrealized gains 458 257
Unrealized losses (2,770) (3,825)
Fair Value 60,338 41,785
Securities Held to Maturity    
Total 83,845 90,784
Unrealized gains 312 179
Unrealized losses (2,759) (4,015)
Fair Value 81,398 86,948
Accrued interest, held-to-maturity 234 281
Accrued interest, available-for-sale 247 144
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 $ 3,600 $ 4,200
Fitch, AAA OR AA Rating | Credit Concentration Risk | Investments    
Securities Held to Maturity    
Concentration risk, percentage 97.00% 97.00%
U.S. Treasury and government agencies    
Securities Available for Sale    
Total $ 22,955 $ 7,596
Unrealized gains 106 22
Unrealized losses (422) (667)
Fair Value 22,639 6,951
Securities Held to Maturity    
Total 33,824 36,529
Unrealized gains 24 9
Unrealized losses (602) (1,141)
Fair Value 33,246 35,397
Agency    
Securities Available for Sale    
Total 31,666 30,643
Unrealized gains 126 46
Unrealized losses (2,131) (2,809)
Fair Value 29,661 27,880
Securities Held to Maturity    
Total 40,983 42,686
Unrealized gains 179 92
Unrealized losses (2,090) (2,733)
Fair Value 39,072 40,045
Residential mortgage- backed non-agency    
Securities Available for Sale    
Total 517 585
Unrealized gains 116 118
Unrealized losses (5) (7)
Fair Value 628 696
Securities Held to Maturity    
Total 245 259
Unrealized gains
Unrealized losses (10) (17)
Fair Value 235 242
Agency    
Securities Available for Sale    
Total 1,980 1,680
Unrealized gains 5 1
Unrealized losses (93) (135)
Fair Value 1,892 1,546
Securities Held to Maturity    
Total 972 939
Unrealized gains 17 9
Unrealized losses (12) (23)
Fair Value 977 925
Commercial mortgage- backed non-agency    
Securities Available for Sale    
Total 752 913
Unrealized gains 1
Unrealized losses (18) (45)
Fair Value 734 869
Securities Held to Maturity    
Total 1,006 1,373
Unrealized gains 3 2
Unrealized losses (10) (27)
Fair Value 999 1,348
Asset-backed    
Securities Available for Sale    
Total 2,229 1,092
Unrealized gains 61 25
Unrealized losses (1) (1)
Fair Value 2,289 1,116
Securities Held to Maturity    
Total 4,006 5,890
Unrealized gains 45 17
Unrealized losses (11) (39)
Fair Value 4,040 5,868
Other    
Securities Available for Sale    
Total 2,551 2,844
Unrealized gains 44 44
Unrealized losses (100) (161)
Fair Value 2,495 2,727
Securities Held to Maturity    
Total 2,809 3,108
Unrealized gains 44 50
Unrealized losses (24) (35)
Fair Value $ 2,829 $ 3,123