Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Schedule of Amortized Cost, Fair Value, and Gross Unrealized Gains and Losses (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Available-for-sale securities:    
Total available-for-sale securities $ 30,294 $ 28,565
Available-for-sale securities, Gross Gains 104 85
Available-for-sale securities, Gross Losses (3,597) (3,345)
Available-for-sale securities 26,801 25,305
Held-to-maturity securities:    
Held-to-maturity securities 15,416 15,750
Held-to-maturity securities, Gross Gains 1 7
Held-to-maturity securities, Gross Losses (2,246) (2,039)
Held-to-maturity securities, Fair Value 13,171 13,718
Other securities, at cost:    
Other securities, Amortized Cost 727 724
Other securities, Gross Gains 0 1
Other securities, Gross Losses 0 0
Other securities, Fair Value 727 725
Cumulative basis adjustments associated with hedging relationships 680 619
U.S. Treasury    
Available-for-sale securities:    
Total available-for-sale securities 5,027 2,855
Available-for-sale securities, Gross Gains 0 1
Available-for-sale securities, Gross Losses 0 0
Available-for-sale securities 5,027 2,856
Residential CMO    
Available-for-sale securities:    
Total available-for-sale securities 3,519 3,592
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses (444) (408)
Available-for-sale securities 3,075 3,184
Held-to-maturity securities:    
Held-to-maturity securities 4,664 4,770
Held-to-maturity securities, Gross Gains 1 6
Held-to-maturity securities, Gross Losses (706) (664)
Held-to-maturity securities, Fair Value 3,959 4,112
Residential MBS    
Available-for-sale securities:    
Total available-for-sale securities 12,893 13,155
Available-for-sale securities, Gross Gains 1 3
Available-for-sale securities, Gross Losses (1,964) (1,776)
Available-for-sale securities 10,930 11,382
Held-to-maturity securities:    
Held-to-maturity securities 9,175 9,368
Held-to-maturity securities, Gross Gains 0 1
Held-to-maturity securities, Gross Losses (1,301) (1,145)
Held-to-maturity securities, Fair Value 7,874 8,224
Commercial MBS    
Available-for-sale securities:    
Total available-for-sale securities 2,530 2,536
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses (735) (709)
Available-for-sale securities 1,795 1,827
Held-to-maturity securities:    
Held-to-maturity securities 1,482 1,509
Held-to-maturity securities, Gross Gains 0 0
Held-to-maturity securities, Gross Losses (232) (224)
Held-to-maturity securities, Fair Value 1,250 1,285
Other agencies    
Available-for-sale securities:    
Total available-for-sale securities 154 161
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses (7) (6)
Available-for-sale securities 147 155
Held-to-maturity securities:    
Held-to-maturity securities 93 101
Held-to-maturity securities, Gross Gains 0 0
Held-to-maturity securities, Gross Losses (7) (6)
Held-to-maturity securities, Fair Value 86 95
Total U.S. Treasury, federal agency, and other agency securities    
Available-for-sale securities:    
Total available-for-sale securities 24,123 22,299
Available-for-sale securities, Gross Gains 1 4
Available-for-sale securities, Gross Losses (3,150) (2,899)
Available-for-sale securities 20,974 19,404
Held-to-maturity securities:    
Held-to-maturity securities 15,414 15,748
Held-to-maturity securities, Gross Gains 1 7
Held-to-maturity securities, Gross Losses (2,246) (2,039)
Held-to-maturity securities, Fair Value 13,169 13,716
Municipal securities    
Available-for-sale securities:    
Total available-for-sale securities 3,475 3,536
Available-for-sale securities, Gross Gains 13 2
Available-for-sale securities, Gross Losses (157) (165)
Available-for-sale securities 3,331 3,373
Held-to-maturity securities:    
Held-to-maturity securities 2 2
Held-to-maturity securities, Gross Gains 0 0
Held-to-maturity securities, Gross Losses 0 0
Held-to-maturity securities, Fair Value 2 2
Private-label CMO    
Available-for-sale securities:    
Total available-for-sale securities 128 131
Available-for-sale securities, Gross Gains 1 0
Available-for-sale securities, Gross Losses (12) (12)
Available-for-sale securities 117 119
Asset-backed securities    
Available-for-sale securities:    
Total available-for-sale securities 379 387
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses (28) (31)
Available-for-sale securities 351 356
Corporate debt    
Available-for-sale securities:    
Total available-for-sale securities 2,179 2,202
Available-for-sale securities, Gross Gains 89 79
Available-for-sale securities, Gross Losses (250) (238)
Available-for-sale securities 2,018 2,043
Other securities/Sovereign debt    
Available-for-sale securities:    
Total available-for-sale securities 10 10
Available-for-sale securities, Gross Gains 0 0
Available-for-sale securities, Gross Losses 0 0
Available-for-sale securities 10 10
Equity securities    
Other securities, at cost:    
Other securities, Amortized Cost 18 17
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value 18 17
Mutual funds    
Other securities, at cost:    
Other securities, Amortized Cost 31 30
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value 31 30
Equity securities    
Other securities, at cost:    
Other securities, Amortized Cost 1 1
Other securities, Gross Gains 0 1
Other securities, Gross Losses 0 0
Other securities, Fair Value 1 2
Debt Securities, Available-For-Sale Securities    
Other securities, at cost:    
Accrued interest receivable 72 61
Debt Securities, Held-To-Maturity Securities    
Other securities, at cost:    
Accrued interest receivable 35 36
Federal Home Loan Bank stock | Non-marketable equity securities:    
Other securities, at cost:    
Other securities, Amortized Cost 159 169
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value 159 169
Federal Reserve Bank stock | Non-marketable equity securities:    
Other securities, at cost:    
Other securities, Amortized Cost 518 507
Other securities, Gross Gains 0 0
Other securities, Gross Losses 0 0
Other securities, Fair Value $ 518 $ 507