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Loans Held-for-Investment (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest on nonaccrual loans $ 1 $ 1 $ 1 $ 1  
Charge-offs 2 10 7 24  
Unpaid principal balance 63   63   $ 75
Loans held-for-investment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans Pledged as Collateral 6,800   6,800   $ 5,300
Residential first mortgage loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs related to sale of loans     103 1,300  
Charge-offs 0 2 1 8  
Significant purchases       150  
Premium paid on significant purchases       1  
Residential first mortgage loans | Nonperforming          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs related to sale of loans     25 110  
Net gain on sale of assets     1 12  
HELOC loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Significant purchases       75  
Loans Insured or Guaranteed by US Government Authorities          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs $ 0 $ 4 $ 2 $ 7