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, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]      
Transfer of securities from held-to-maturity to available-for-sale $ 2,842 $ 0 $ 2,707
Unrealized Net Gains Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities 21    
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities $ 14,400 $ 3,800