Annual report pursuant to Section 13 and 15(d)

NONINTEREST INCOME - Summary of Noninterest Income (Details)

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NONINTEREST INCOME - Summary of Noninterest Income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Noninterest income from contracts with customers $ 884 $ 939 $ 881
Noninterest income within the scope of other GAAP topics 707 515 440
Total noninterest income $ 1,591 $ 1,454 $ 1,321