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SECURITIES - Schedule of Securities Pledged (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Pledged against derivatives, to qualify for fiduciary powers, or to secure public and other deposits as required by law |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Debt securities at amortized cost | $ 7,402 | $ 5,619
Debt securities at fair value | 6,838 | 5,305
Pledged as collateral for FHLB borrowing capacity |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Debt securities at amortized cost | 242 | 242
Debt securities at fair value | 222 | 220
Pledged against repurchase agreements |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Debt securities at amortized cost | 0 | 0
Debt securities at fair value | $ 0 | $ 0

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), 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 net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + Details
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