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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 | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities: |  |
Total available-for-sale securities | $ 28,602 | $ 30,743
Available-for-sale securities, Gross Gains | 58 | 13
Available-for-sale securities, Gross Losses | (2,575) | (3,483)
Available-for-sale securities | 26,085 | 27,273
Held-to-maturity securities: |  |
Held-to-maturity securities | 15,597 | 16,368
Held-to-maturity securities, Gross Gains | 20 | 3
Held-to-maturity securities, Gross Losses | (1,748) | (2,285)
Held-to-maturity securities, Fair Value | 13,869 | 14,086
Other securities, at cost: |  |
Other securities, Amortized Cost | 870 | 822
Other securities, Gross Gains | 0 | 1
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | 870 | 823
Accrued interest receivable on AFS securities | 89 | 89
Accrued interest receivable on HTM securities | 41 | 46
Cumulative Amount of Fair Value Hedging Adjustment To Hedged Items | 160 | 458
U.S. Treasury |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 5,371 | 6,588
Available-for-sale securities, Gross Gains | 42 | 11
Available-for-sale securities, Gross Losses | (3) | (43)
Available-for-sale securities | 5,410 | 6,556
Held-to-maturity securities: |  |
Held-to-maturity securities | 2,339 | 2,045
Held-to-maturity securities, Gross Gains | 16 | 0
Held-to-maturity securities, Gross Losses | (1) | (22)
Held-to-maturity securities, Fair Value | 2,354 | 2,023
US Treasury and Government |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 23,826 | 25,008
Available-for-sale securities, Gross Gains | 50 | 12
Available-for-sale securities, Gross Losses | (2,454) | (3,220)
Available-for-sale securities | 21,422 | 21,800
Held-to-maturity securities: |  |
Held-to-maturity securities | 15,596 | 16,367
Held-to-maturity securities, Gross Gains | 20 | 3
Held-to-maturity securities, Gross Losses | (1,748) | (2,285)
Held-to-maturity securities, Fair Value | 13,868 | 14,085
Residential MBS |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 11,133 | 11,988
Available-for-sale securities, Gross Gains | 3 | 0
Available-for-sale securities, Gross Losses | (1,461) | (1,971)
Available-for-sale securities | 9,675 | 10,017
Held-to-maturity securities: |  |
Held-to-maturity securities | 7,919 | 8,533
Held-to-maturity securities, Gross Gains | 0 | 0
Held-to-maturity securities, Gross Losses | (1,005) | (1,336)
Held-to-maturity securities, Fair Value | 6,914 | 7,197
Residential CMO |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 4,761 | 3,778
Available-for-sale securities, Gross Gains | 5 | 1
Available-for-sale securities, Gross Losses | (324) | (434)
Available-for-sale securities | 4,442 | 3,345
Held-to-maturity securities: |  |
Held-to-maturity securities | 3,971 | 4,309
Held-to-maturity securities, Gross Gains | 4 | 3
Held-to-maturity securities, Gross Losses | (543) | (691)
Held-to-maturity securities, Fair Value | 3,432 | 3,621
Commercial MBS |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 2,445 | 2,519
Available-for-sale securities, Gross Gains | 0 | 0
Available-for-sale securities, Gross Losses | (663) | (767)
Available-for-sale securities | 1,782 | 1,752
Held-to-maturity securities: |  |
Held-to-maturity securities | 1,314 | 1,407
Held-to-maturity securities, Gross Gains | 0 | 0
Held-to-maturity securities, Gross Losses | (196) | (231)
Held-to-maturity securities, Fair Value | 1,118 | 1,176
Other agencies |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 116 | 135
Available-for-sale securities, Gross Gains | 0 | 0
Available-for-sale securities, Gross Losses | (3) | (5)
Available-for-sale securities | 113 | 130
Held-to-maturity securities: |  |
Held-to-maturity securities | 53 | 73
Held-to-maturity securities, Gross Gains | 0 | 0
Held-to-maturity securities, Gross Losses | (3) | (5)
Held-to-maturity securities, Fair Value | 50 | 68
Municipal securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 4,194 | 4,119
Available-for-sale securities, Gross Gains | 8 | 1
Available-for-sale securities, Gross Losses | (87) | (132)
Available-for-sale securities | 4,115 | 3,988
Held-to-maturity securities: |  |
Held-to-maturity securities | 1 | 1
Held-to-maturity securities, Gross Gains | 0 | 0
Held-to-maturity securities, Gross Losses | 0 | 0
Held-to-maturity securities, Fair Value | 1 | 1
Corporate debt |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 192 | 119
Available-for-sale securities, Gross Gains | 0 | 0
Available-for-sale securities, Gross Losses | (17) | (10)
Available-for-sale securities | 175 | 109
Asset-backed securities |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 269 | 330
Available-for-sale securities, Gross Gains | 0 | 0
Available-for-sale securities, Gross Losses | (10) | (19)
Available-for-sale securities | 259 | 311
Private-label CMO |  |
Available-for-sale securities: |  |
Total available-for-sale securities | 111 | 1,157
Available-for-sale securities, Gross Gains | 0 | 0
Available-for-sale securities, Gross Losses | (7) | (102)
Available-for-sale securities | 104 | 1,055
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
Non-marketable equity securities: | FRB stock |  |
Other securities, at cost: |  |
Other securities, Amortized Cost | 575 | 521
Other securities, Gross Gains | 0 | 0
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | 575 | 521
Non-marketable equity securities: | FHLB stock |  |
Other securities, at cost: |  |
Other securities, Amortized Cost | 237 | 246
Other securities, Gross Gains | 0 | 0
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | 237 | 246
Other non-marketable equity securities |  |
Other securities, at cost: |  |
Other securities, Amortized Cost | 26 | 25
Other securities, Gross Gains | 0 | 0
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | 26 | 25
Mutual funds |  |
Other securities, at cost: |  |
Other securities, Amortized Cost | 30 | 29
Other securities, Gross Gains | 0 | 0
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | 30 | 29
Equity securities |  |
Other securities, at cost: |  |
Other securities, Amortized Cost | 2 | 1
Other securities, Gross Gains | 0 | 1
Other securities, Gross Losses | 0 | 0
Other securities, Fair Value | $ 2 | $ 2

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