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
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]        
Available For Sale Securities Transferred To Held To Maturity Securities $ 1,500 $ 1,520 $ 0  
Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities 22      
Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities $ 18,500 $ 18,500   $ 3,800