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SECURITIES - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |  |  |
Accrued interest receivable on debt securities | $ 135,000,000 |  | $ 135,000,000 |  | $ 125,000,000
Taxable interest income from securities | $ 433,000,000 | $ 423,000,000 | $ 1,300,000,000 | $ 1,200,000,000 |
Held-to-maturity, zero expected credit loss, percent of portfolio | 96.00% |  | 96.00% |  |
Allowance for credit loss recognized | $ 0 |  | $ 0 |  |
Mortgage-backed securities |  |  |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |  |  |
Securitizations of mortgage loans | 87,000,000 | $ 48,000,000 |  | $ 181,000,000 |
Securities Sold under Agreements to Repurchase |  |  |  |  |
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items] |  |  |  |  |
Debt securities at fair value | $ 3,600,000,000 |  | $ 3,600,000,000 |  | $ 4,000,000,000.0

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- Definition [Line Items] for Schedule of Available-for-sale and Held-to-maturity Securities [Table] + References No definition available. + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph a -Publisher SEC Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1402 -Paragraph b -Subparagraph (1)(Instruction 4) -Publisher SEC + Details
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