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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Related Loan Balances by Portfolio Segment (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Loan losses allowance            
Individually evaluated for impairment     $ 55      
Collectively evaluated for impairment     483      
Total allowance for loan losses $ 1,371 $ 1,452 538 $ 573 $ 562 $ 474
Loans held for investment:            
Individually evaluated for impairment     682      
Collectively evaluated for impairment     87,531      
Loans held for investment 84,974   88,213      
Commercial            
Loan losses allowance            
Total allowance for loan losses 881 932 354 400 407  
Loans held for investment:            
Loans held for investment 49,981   45,745      
Consumer            
Loan losses allowance            
Total allowance for loan losses 490 520 184 173 155  
Loans held for investment:            
Loans held for investment 34,993   42,468      
Unallocated            
Loan losses allowance            
Total allowance for loan losses $ 0 $ 0   $ 0 $ 0  
Unallocated            
Loan losses allowance            
Total allowance for loan losses     0      
Loans held for investment:            
Loans held for investment     0      
Unallocated | Unallocated            
Loan losses allowance            
Total allowance for loan losses     0     5
Commercial Loans            
Loan losses allowance            
Individually evaluated for impairment     43      
Collectively evaluated for impairment     311      
Loans held for investment:            
Individually evaluated for impairment     436      
Collectively evaluated for impairment     45,309      
Commercial Loans | Commercial            
Loan losses allowance            
Total allowance for loan losses     354     359
Consumer Loans            
Loan losses allowance            
Individually evaluated for impairment     12      
Collectively evaluated for impairment     172      
Loans held for investment:            
Individually evaluated for impairment     246      
Collectively evaluated for impairment     42,222      
Consumer Loans | Consumer            
Loan losses allowance            
Total allowance for loan losses     184     $ 110
Purchased Credit Impaired Loan [Member]            
Loan losses allowance            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     0      
Loans held for investment:            
Individually evaluated for impairment     0      
Collectively evaluated for impairment     $ 0