v3.26.1
Investment Securities (Summary) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Securities Available-for-Sale    
Total $ 73,150 $ 69,897
Unrealized gains 456 621
Unrealized losses (2,534) (2,383)
Fair Value 71,072 68,135
Securities Held-to-Maturity    
Total 72,040 70,105
Unrealized gains 255 403
Unrealized losses (2,827) (2,529)
Fair Value 69,468 67,979
Accrued interest, held-to-maturity 212 219
Accrued interest, available-for-sale 266 348
Debt securities, available for sale, allowance for credit loss 61 61
Debt securities, held to maturity, allowance for credit loss 5 5
Net unrealized losses, related to securities transferred at fair value to held to maturity at a point in time $ 2,500 $ 2,700
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 $ 26,765 $ 29,022
Unrealized gains 90 188
Unrealized losses (356) (313)
Fair Value 26,499 28,897
Securities Held-to-Maturity    
Total 18,880 21,537
Unrealized gains 16 25
Unrealized losses (358) (318)
Fair Value 18,538 21,244
Residential mortgage-backed agency    
Securities Available-for-Sale    
Total 37,562 32,429
Unrealized gains 134 176
Unrealized losses (2,043) (1,942)
Fair Value 35,653 30,663
Securities Held-to-Maturity    
Total 44,508 42,599
Unrealized gains 182 279
Unrealized losses (2,365) (2,155)
Fair Value 42,325 40,723
Residential mortgage- backed non-agency    
Securities Available-for-Sale    
Total 430 442
Unrealized gains 107 110
Unrealized losses (4) (4)
Fair Value 533 548
Securities Held-to-Maturity    
Total 219 222
Unrealized gains 0 0
Unrealized losses (12) (11)
Fair Value 207 211
Commercial mortgage-backed agency    
Securities Available-for-Sale    
Total 3,446 3,395
Unrealized gains 35 43
Unrealized losses (69) (66)
Fair Value 3,412 3,372
Securities Held-to-Maturity    
Total 4,364 1,091
Unrealized gains 13 16
Unrealized losses (43) (7)
Fair Value 4,334 1,100
Commercial mortgage- backed non-agency    
Securities Available-for-Sale    
Total 229 256
Unrealized gains 0 0
Unrealized losses (3) (4)
Fair Value 226 252
Securities Held-to-Maturity    
Total 223 328
Unrealized gains 2 3
Unrealized losses 0 (1)
Fair Value 225 330
Asset-backed    
Securities Available-for-Sale    
Total 2,272 2,247
Unrealized gains 38 50
Unrealized losses (1) 0
Fair Value 2,309 2,297
Securities Held-to-Maturity    
Total 1,364 1,840
Unrealized gains 20 46
Unrealized losses (6) (6)
Fair Value 1,378 1,880
Other    
Securities Available-for-Sale    
Total 2,446 2,106
Unrealized gains 52 54
Unrealized losses (58) (54)
Fair Value 2,440 2,106
Securities Held-to-Maturity    
Total 2,482 2,488
Unrealized gains 22 34
Unrealized losses (43) (31)
Fair Value $ 2,461 $ 2,491