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Accounting Policies and Basis of Presentation (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
segment
branch
State
Jan. 03, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Accounting Policies [Abstract]        
Goodwill $ 346   $ 346  
Business Acquisition [Line Items]        
Number of branches | branch 600      
Number of states in which entity operates | State 22      
Number of operating segments | segment 3      
Assets held-for-sale $ 83   99  
Bank owned life insurance 1,326   116  
Operating lease equipment, net 7,972   $ 0 $ 0
Residential mortgage-backed securities        
Business Acquisition [Line Items]        
Assets held-for-sale 65      
Commercial loan        
Business Acquisition [Line Items]        
Assets held-for-sale $ 16      
CIT Group Inc.        
Business Acquisition [Line Items]        
Bank-owned life insurance acquired in business combination   $ 1,202    
CIT Group Inc. | Class A Common Stock, Par Value $1        
Business Acquisition [Line Items]        
Common stock, terms of conversion, conversion ratio   0.062