Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details)

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INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investment Securities [Line Items]        
Transfer of securities from available-for-sale to held-to-maturity $ 4,200 $ 4,225 $ 3,007  
Unrealized gains attributed to transfer of securities (58)      
AFS debt security charge-off $ 4      
Asset Pledged as Collateral        
Investment Securities [Line Items]        
Investment securities pledged   $ 28,000   $ 21,700