Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details)

v3.20.2
INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]        
Transfer of securities from available-for-sale to held-to-maturity $ 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   $ 16,800   $ 3,800