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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale $ 1,115   $ 1,294      
Loans held-for-sale 3,352   2,541      
Loans held-for-investment 80   111      
Mortgage servicing rights 302   296      
Total assets at fair value 3,432   2,652      
Agency - Commercial            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 510   766      
Agency - Residential            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 573   514      
Municipal obligations            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 32   14      
Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 1,115   1,294      
Loans held-for-sale 3,394   2,578      
Loans held-for-investment 6,134   6,121      
Mortgage servicing rights 302   296      
Liabilities, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 60   84      
Warrant liabilities (10)   (8)      
Long-term Debt, Fair Value 257   89      
Level 1 | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Loans held-for-sale 0   0      
Loans held-for-investment 0   0      
Mortgage servicing rights 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0   0      
Warrant liabilities 0   0      
Long-term Debt, Fair Value 0   0      
Level 2 | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 1,115   1,294      
Loans held-for-sale 3,394   2,578      
Loans held-for-investment 8   6      
Mortgage servicing rights 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0   0      
Warrant liabilities (10)   (8)      
Long-term Debt, Fair Value 257   89      
Level 3 | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Loans held-for-sale 0   0      
Loans held-for-investment 6,126   6,115      
Mortgage servicing rights 302   296      
Liabilities, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 60   84      
Warrant liabilities 0   0      
Long-term Debt, Fair Value 0   0      
Recurring | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Mortgage servicing rights 302   296      
Total derivative assets 119   58      
Total assets at fair value 4,968   4,301      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (93)   (18)      
Warrant liabilities (10)   (8)      
DOJ litigation settlement (60)   (84)      
Total liabilities at fair value (163)   (110)      
Recurring | Total Fair Value | Residential first mortgage loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-sale 3,352   2,541      
Loans held-for-investment 8   6      
Recurring | Total Fair Value | Second mortgage            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 41   42      
Recurring | Total Fair Value | Agency - Commercial            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 510   766      
Recurring | Total Fair Value | Agency - Residential            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 573   514      
Recurring | Total Fair Value | Municipal obligations            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 32   14      
Recurring | Total Fair Value | HELOC loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 31   64      
Recurring | Level 1            
Assets, Fair Value Disclosure [Abstract]            
Mortgage servicing rights 0   0      
Total derivative assets 1   0      
Total assets at fair value 1   0      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0   (1)      
Warrant liabilities 0   0      
DOJ litigation settlement 0   0      
Total liabilities at fair value 0   (1)      
Recurring | Level 1 | Residential first mortgage loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-sale 0   0      
Loans held-for-investment 0   0      
Recurring | Level 1 | Second mortgage            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 0   0      
Recurring | Level 1 | Agency - Commercial            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 1 | Agency - Residential            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 1 | Municipal obligations            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 1 | HELOC loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 0   0      
Recurring | Level 2            
Assets, Fair Value Disclosure [Abstract]            
Mortgage servicing rights 0   0      
Total derivative assets 55   32      
Total assets at fair value 4,530   3,873      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (93)   (17)      
Warrant liabilities (10)   (8)      
DOJ litigation settlement 0   0      
Total liabilities at fair value (103)   (25)      
Recurring | Level 2 | Residential first mortgage loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-sale 3,352   2,541      
Loans held-for-investment 8   6      
Recurring | Level 2 | Second mortgage            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 0   0      
Recurring | Level 2 | Agency - Commercial            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 510   766      
Recurring | Level 2 | Agency - Residential            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 573   514      
Recurring | Level 2 | Municipal obligations            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 32   14      
Recurring | Level 2 | HELOC loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 0   0      
Recurring | Level 3            
Assets, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 374 $ 383 402 $ 519 $ 558 $ 545
Mortgage servicing rights 302   296      
Total derivative assets 63   26      
Total assets at fair value 437   428      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0   0      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value       $ 116 $ 120 $ 166
Warrant liabilities 0   0      
DOJ litigation settlement (60)   (84)      
Total liabilities at fair value (60)   (84)      
Recurring | Level 3 | Residential first mortgage loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-sale 0   0      
Loans held-for-investment 0   0      
Recurring | Level 3 | Second mortgage            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment 41   42      
Recurring | Level 3 | Agency - Commercial            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 3 | Agency - Residential            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 3 | Municipal obligations            
Assets, Fair Value Disclosure [Abstract]            
Investment securities available-for-sale 0   0      
Recurring | Level 3 | HELOC loans            
Assets, Fair Value Disclosure [Abstract]            
Loans held-for-investment     64      
Rate lock commitments | Recurring | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 63   26      
Rate lock commitments | Recurring | Level 1            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Rate lock commitments | Recurring | Level 2            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Rate lock commitments | Recurring | Level 3            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 63   26      
Mortgage-backed Securities, US Government Agencies [Member] | Recurring | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 2   7      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (24)   (6)      
Mortgage-backed Securities, US Government Agencies [Member] | Recurring | Level 1            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0   0      
Mortgage-backed Securities, US Government Agencies [Member] | Recurring | Level 2            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 2   7      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (24)   (6)      
Mortgage-backed Securities, US Government Agencies [Member] | Recurring | Level 3            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0   0      
Interest rate swaps and swaptions | Recurring | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 53   25      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (17)          
Interest rate swaps and swaptions | Recurring | Level 1            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0          
Interest rate swaps and swaptions | Recurring | Level 2            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 53   25      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (17)          
Interest rate swaps and swaptions | Recurring | Level 3            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0   0      
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0          
U.S. Treasury, swap and euro dollar futures | Recurring | Total Fair Value            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 1          
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     (1)      
U.S. Treasury, swap and euro dollar futures | Recurring | Level 1            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 1          
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     (1)      
U.S. Treasury, swap and euro dollar futures | Recurring | Level 2            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0          
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     0      
U.S. Treasury, swap and euro dollar futures | Recurring | Level 3            
Assets, Fair Value Disclosure [Abstract]            
Total derivative assets 0          
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     0      
Interest rate swaps on FHLB advances | Recurring | Total Fair Value            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (52)   (4)      
Interest rate swaps on FHLB advances | Recurring | Level 1            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities 0   0      
Interest rate swaps on FHLB advances | Recurring | Level 2            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities (52)   (4)      
Interest rate swaps on FHLB advances | Recurring | Level 3            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities $ 0   0      
Interest rate swaps | Recurring | Total Fair Value            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     (7)      
Interest rate swaps | Recurring | Level 1            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     0      
Interest rate swaps | Recurring | Level 2            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     (7)      
Interest rate swaps | Recurring | Level 3            
Liabilities, Fair Value Disclosure [Abstract]            
Total derivative liabilities     $ 0