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Investment Securities (Summary) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Securities Available-for-Sale    
Total $ 66,024 $ 65,498
Unrealized gains 372 243
Unrealized losses (3,078) (3,702)
Fair Value 63,318 62,039
Securities Held-to-Maturity    
Total 74,457 77,693
Unrealized gains 145 78
Unrealized losses (3,676) (4,713)
Fair Value 70,926 73,058
Accrued interest, held-to-maturity 204 242
Accrued interest, available-for-sale 259 328
Debt securities, available for sale, allowance for credit loss 63 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 $ 3,200 $ 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 $ 24,754 $ 23,962
Unrealized gains 103 25
Unrealized losses (353) (436)
Fair Value 24,504 23,551
Securities Held-to-Maturity    
Total 27,789 29,420
Unrealized gains 15 0
Unrealized losses (619) (896)
Fair Value 27,185 28,524
Residential mortgage-backed agency    
Securities Available-for-Sale    
Total 33,157 33,589
Unrealized gains 69 28
Unrealized losses (2,512) (2,991)
Fair Value 30,714 30,626
Securities Held-to-Maturity    
Total 39,378 40,171
Unrealized gains 65 16
Unrealized losses (2,960) (3,696)
Fair Value 36,483 36,491
Residential mortgage- backed non-agency    
Securities Available-for-Sale    
Total 489 504
Unrealized gains 111 105
Unrealized losses (4) (6)
Fair Value 596 603
Securities Held-to-Maturity    
Total 236 240
Unrealized gains 0 0
Unrealized losses (16) (21)
Fair Value 220 219
Commercial mortgage-backed agency    
Securities Available-for-Sale    
Total 2,548 2,077
Unrealized gains 5 1
Unrealized losses (100) (133)
Fair Value 2,453 1,945
Securities Held-to-Maturity    
Total 922 955
Unrealized gains 8 3
Unrealized losses (15) (28)
Fair Value 915 930
Commercial mortgage- backed non-agency    
Securities Available-for-Sale    
Total 613 706
Unrealized gains 0 0
Unrealized losses (10) (15)
Fair Value 603 691
Securities Held-to-Maturity    
Total 644 836
Unrealized gains 4 3
Unrealized losses (3) (7)
Fair Value 645 832
Asset-backed    
Securities Available-for-Sale    
Total 2,289 2,353
Unrealized gains 42 42
Unrealized losses (1) (3)
Fair Value 2,330 2,392
Securities Held-to-Maturity    
Total 2,926 3,380
Unrealized gains 39 37
Unrealized losses (10) (16)
Fair Value 2,955 3,401
Other    
Securities Available-for-Sale    
Total 2,174 2,307
Unrealized gains 42 42
Unrealized losses (98) (118)
Fair Value 2,118 2,231
Securities Held-to-Maturity    
Total 2,562 2,691
Unrealized gains 14 19
Unrealized losses (53) (49)
Fair Value $ 2,523 $ 2,661