Annual report pursuant to Section 13 and 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]      
Transfer of securities from available-for-sale to held-to-maturity $ 0 $ 4,225 $ 3,007
Unrealized net gains recognized in OCI   (58)  
Asset Pledged as Collateral      
Debt Securities, Available-for-Sale [Line Items]      
Investment securities $ 35,100 $ 26,900