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
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]                      
Noninterest income from contracts with customers                 $ 939 $ 881  
Noninterest income within the scope of other GAAP topics                 515 440  
Total noninterest income $ 372 $ 389 $ 374 $ 319 $ 329 $ 342 $ 336 $ 314 $ 1,454 $ 1,321 $ 1,307