Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016 |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | $ 1,650 | $ 1,480 |
Loans held-for-sale | 4,511 | 3,145 |
Loans held-for-investment | 13 | 72 |
Mortgage servicing rights | 295 | 335 |
Total assets at fair value | 4,524 | 3,217 |
Agency - Commercial | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 532 | 548 |
Agency - Residential | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 1,063 | 898 |
Municipal obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 36 | 34 |
Corporate debt obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 19 | |
Total Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 1,650 | 1,480 |
Loans held-for-sale | 4,544 | 3,178 |
Loans held-for-investment | 5,899 | 5,998 |
Mortgage servicing rights | 295 | 335 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | (4) |
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] | | |
Warrant liabilities | | 0 |
Level 2 | Total Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 1,650 | 1,480 |
Loans held-for-sale | 4,492 | 3,178 |
Loans held-for-investment | 8 | 7 |
Mortgage servicing rights | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | (4) |
Level 3 | Total Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 0 | 0 |
Loans held-for-sale | 52 | 0 |
Loans held-for-investment | 5,891 | 5,991 |
Mortgage servicing rights | 295 | 335 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | 0 |
Recurring | Total Fair Value | | |
Assets, Fair Value Disclosure [Abstract] | | |
Mortgage servicing rights | 295 | 335 |
Total assets at fair value | 6,546 | 5,155 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | (4) |
DOJ litigation settlement | (60) | (60) |
Total liabilities at fair value | (102) | (118) |
Recurring | Total Fair Value | Rate lock commitments | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 41 | 24 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | (6) |
Recurring | Total Fair Value | Mortgage-backed securities forwards | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 3 | 43 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (38) | (11) |
Recurring | Total Fair Value | Interest rate swaps and swaptions | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 32 | 35 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (3) | |
Recurring | Total Fair Value | Futures | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 1 | 2 |
Recurring | Total Fair Value | Interest rate swaps on FHLB advances | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | | 19 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (1) | |
Recurring | Total Fair Value | Interest rate swaps | | |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | (37) |
Recurring | Total Fair Value | Residential first mortgage loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 4,458 | 3,145 |
Loans held-for-investment | 8 | 7 |
Recurring | Total Fair Value | Second mortgage | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 39 | |
Loans held-for-investment | 4 | 41 |
Recurring | Total Fair Value | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 14 | |
Recurring | Total Fair Value | Agency - Commercial | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 532 | 548 |
Recurring | Total Fair Value | Agency - Residential | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 1,063 | 898 |
Recurring | Total Fair Value | Municipal obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 36 | 34 |
Recurring | Total Fair Value | Corporate debt obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 19 | |
Recurring | Total Fair Value | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-investment | 1 | 24 |
Recurring | Level 1 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Mortgage servicing rights | 0 | 0 |
Total assets at fair value | 1 | 2 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | 0 |
DOJ litigation settlement | 0 | 0 |
Total liabilities at fair value | 0 | 0 |
Recurring | Level 1 | Rate lock commitments | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | 0 |
Recurring | Level 1 | Mortgage-backed securities forwards | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | 0 |
Recurring | Level 1 | Interest rate swaps and swaptions | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | |
Recurring | Level 1 | Futures | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 1 | 2 |
Recurring | Level 1 | Interest rate swaps on FHLB advances | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | |
Recurring | Level 1 | Interest rate swaps | | |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | 0 |
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-sale | 0 | |
Loans held-for-investment | 0 | 0 |
Recurring | Level 1 | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 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 | Corporate debt obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 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 assets at fair value | 6,151 | 4,729 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | (4) |
DOJ litigation settlement | 0 | 0 |
Total liabilities at fair value | (42) | (52) |
Recurring | Level 2 | Rate lock commitments | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | 0 |
Recurring | Level 2 | Mortgage-backed securities forwards | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 3 | 43 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (38) | (11) |
Recurring | Level 2 | Interest rate swaps and swaptions | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 32 | 35 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (3) | |
Recurring | Level 2 | Futures | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Recurring | Level 2 | Interest rate swaps on FHLB advances | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | | 19 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | (1) | |
Recurring | Level 2 | Interest rate swaps | | |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | (37) |
Recurring | Level 2 | Residential first mortgage loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 4,458 | 3,145 |
Loans held-for-investment | 8 | 7 |
Recurring | Level 2 | Second mortgage | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 0 | |
Loans held-for-investment | 0 | 0 |
Recurring | Level 2 | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 0 | |
Recurring | Level 2 | Agency - Commercial | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 532 | 548 |
Recurring | Level 2 | Agency - Residential | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 1,063 | 898 |
Recurring | Level 2 | Municipal obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 36 | 34 |
Recurring | Level 2 | Corporate debt obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 19 | |
Recurring | Level 2 | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-investment | 0 | 0 |
Recurring | Level 3 | | |
Assets, Fair Value Disclosure [Abstract] | | |
Mortgage servicing rights | 295 | 335 |
Total assets at fair value | 394 | 424 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Warrant liabilities | | 0 |
DOJ litigation settlement | (60) | (60) |
Total liabilities at fair value | (60) | (66) |
Recurring | Level 3 | Rate lock commitments | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 41 | 24 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | (6) |
Recurring | Level 3 | Mortgage-backed securities forwards | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | 0 |
Recurring | Level 3 | Interest rate swaps and swaptions | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | |
Recurring | Level 3 | Futures | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | 0 | 0 |
Recurring | Level 3 | Interest rate swaps on FHLB advances | | |
Assets, Fair Value Disclosure [Abstract] | | |
Total derivative assets | | 0 |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | 0 | |
Recurring | Level 3 | Interest rate swaps | | |
Liabilities, Fair Value Disclosure [Abstract] | | |
Derivative liabilities | | 0 |
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-sale | 39 | |
Loans held-for-investment | 4 | 41 |
Recurring | Level 3 | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-sale | 14 | |
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 | Corporate debt obligations | | |
Assets, Fair Value Disclosure [Abstract] | | |
Investment securities available-for-sale | 0 | |
Recurring | Level 3 | HELOC loans | | |
Assets, Fair Value Disclosure [Abstract] | | |
Loans held-for-investment | $ 1 | $ 24 |