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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Securities Available-for-Sale    
Total $ 70,421 $ 65,498
Unrealized gains 541 243
Unrealized losses (2,665) (3,702)
Fair Value 68,297 62,039
Securities Held-to-Maturity    
Total 73,226 77,693
Unrealized gains 333 78
Unrealized losses (2,881) (4,713)
Fair Value 70,678 73,058
Accrued interest, held-to-maturity 207 242
Accrued interest, available-for-sale 282 328
Debt securities, available for sale, allowance for credit loss 62 86
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 $ 2,800 $ 3,400
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 $ 27,953 $ 23,962
Unrealized gains 131 25
Unrealized losses (385) (436)
Fair Value 27,699 23,551
Securities Held-to-Maturity    
Total 24,428 29,420
Unrealized gains 23 0
Unrealized losses (402) (896)
Fair Value 24,049 28,524
Residential mortgage-backed agency    
Securities Available-for-Sale    
Total 33,758 33,589
Unrealized gains 160 28
Unrealized losses (2,131) (2,991)
Fair Value 31,787 30,626
Securities Held-to-Maturity    
Total 42,190 40,171
Unrealized gains 219 16
Unrealized losses (2,410) (3,696)
Fair Value 39,999 36,491
Residential mortgage- backed non-agency    
Securities Available-for-Sale    
Total 452 504
Unrealized gains 112 105
Unrealized losses (4) (6)
Fair Value 560 603
Securities Held-to-Maturity    
Total 226 240
Unrealized gains 0 0
Unrealized losses (13) (21)
Fair Value 213 219
Commercial mortgage-backed agency    
Securities Available-for-Sale    
Total 3,418 2,077
Unrealized gains 37 1
Unrealized losses (75) (133)
Fair Value 3,380 1,945
Securities Held-to-Maturity    
Total 1,094 955
Unrealized gains 16 3
Unrealized losses (9) (28)
Fair Value 1,101 930
Commercial mortgage- backed non-agency    
Securities Available-for-Sale    
Total 294 706
Unrealized gains 0 0
Unrealized losses (4) (15)
Fair Value 290 691
Securities Held-to-Maturity    
Total 520 836
Unrealized gains 4 3
Unrealized losses (1) (7)
Fair Value 523 832
Asset-backed    
Securities Available-for-Sale    
Total 2,391 2,353
Unrealized gains 52 42
Unrealized losses 0 (3)
Fair Value 2,443 2,392
Securities Held-to-Maturity    
Total 2,261 3,380
Unrealized gains 43 37
Unrealized losses (6) (16)
Fair Value 2,298 3,401
Other    
Securities Available-for-Sale    
Total 2,155 2,307
Unrealized gains 49 42
Unrealized losses (66) (118)
Fair Value 2,138 2,231
Securities Held-to-Maturity    
Total 2,507 2,691
Unrealized gains 28 19
Unrealized losses (40) (49)
Fair Value $ 2,495 $ 2,661