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Business Segment Reporting - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Segment
Dec. 31, 2019
USD ($)
Branch
industry_sector
Dec. 31, 2018
USD ($)
Segment
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]        
Number of operating segments | Segment 2   2  
Goodwill   $ 2,664 $ 2,516 $ 2,538
Federal income tax rate   21.00% 21.00% 35.00%
State income tax rate   2.70%   2.20%
Consumer Bank [Member]        
Segment Reporting Information [Line Items]        
Goodwill $ 1,600 $ 1,752 $ 2,102 $ 2,124
Number of state branch network | Branch   15    
Commercial Bank [Member]        
Segment Reporting Information [Line Items]        
Goodwill $ 912 $ 912 $ 414 $ 414
Number of business units | industry_sector   7