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Loans Held-for-Investment - Method of Evaluation by Class of Loan (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated $ 53 $ 55    
Loans held-for-investment, collectively evaluated 12,064 9,023    
Total loans 12,117 9,078    
Allowance for loan losses, individually evaluated 13 11    
Allowance for loan losses, collectively evaluated 94 117    
Total allowance for loan losses 107 128 $ 140 $ 142
Residential first mortgage        
Allowance for Loan Losses, Additional Disclosure        
Total loans 3,145 2,991    
Total allowance for loan losses 22 38 47 65
Home equity        
Allowance for Loan Losses, Additional Disclosure        
Total loans 1,021 729    
Total allowance for loan losses 14 15 22 24
Other consumer        
Allowance for Loan Losses, Additional Disclosure        
Total loans 729 314    
Total allowance for loan losses 6 3 1 1
Commercial real estate        
Allowance for Loan Losses, Additional Disclosure        
Total loans 2,828 2,152    
Total allowance for loan losses 38 48 45 28
Commercial and industrial        
Allowance for Loan Losses, Additional Disclosure        
Total loans 1,634 1,433    
Total allowance for loan losses 22 18 19 17
Warehouse lending        
Allowance for Loan Losses, Additional Disclosure        
Total loans 2,760 1,459    
Total allowance for loan losses 5 6 $ 6 $ 7
Other consumer | Residential first mortgage        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 32 32    
Loans held-for-investment, collectively evaluated 3,113 2,959    
Allowance for loan losses, individually evaluated 5 4    
Allowance for loan losses, collectively evaluated 17 34    
Total allowance for loan losses   38    
Other consumer | Home equity        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 20 23    
Loans held-for-investment, collectively evaluated 1,001 706    
Allowance for loan losses, individually evaluated 7 7    
Allowance for loan losses, collectively evaluated 7 8    
Total allowance for loan losses   15    
Other consumer | Other consumer        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 1 0    
Loans held-for-investment, collectively evaluated 728 314    
Allowance for loan losses, individually evaluated 1 0    
Allowance for loan losses, collectively evaluated 5 3    
Total allowance for loan losses   3    
Commercial portfolio segment | Commercial real estate        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 0 0    
Loans held-for-investment, collectively evaluated 2,828 2,152    
Allowance for loan losses, individually evaluated 0 0    
Allowance for loan losses, collectively evaluated 38 48    
Total allowance for loan losses   48    
Commercial portfolio segment | Commercial and industrial        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 0 0    
Loans held-for-investment, collectively evaluated 1,634 1,433    
Allowance for loan losses, individually evaluated 0 0    
Allowance for loan losses, collectively evaluated 22 18    
Total allowance for loan losses   18    
Commercial portfolio segment | Warehouse lending        
Allowance for Loan Losses, Additional Disclosure        
Loans held-for-investment, individually evaluated 0 0    
Loans held-for-investment, collectively evaluated 2,760 1,459    
Allowance for loan losses, individually evaluated 0 0    
Allowance for loan losses, collectively evaluated $ 5 6    
Total allowance for loan losses   $ 6