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 6 Months Ended
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]      
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities $ 14,400 $ 19,900  
Transfer of securities from available-for-sale to held-to-maturity 3,000 $ 3,007 $ 1,520
Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities $ 2