Quarterly report pursuant to Section 13 or 15(d)

ACQUISITION OF TCF FINANCIAL CORPORATION -Pro Forma (Details)

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ACQUISITION OF TCF FINANCIAL CORPORATION -Pro Forma (Details) - TCF Financial Corporation - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Net Income (Loss) $ 235 $ 189 $ 901 $ 69
Interest and dividend income operating [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue 1,120 1,184 2,482 2,381
Noninterest income [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue $ 529 $ 529 $ 1,062 $ 1,032