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Fair Value of Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2016 USD ($)
Subordinate Securities |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 64 | $ 187
Residential loans |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 1,220 | 3,730
MSRs |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 3 | $ 23
MSRs | Maximum |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Difference of internal valuation than dealer marks (percent) | 5.00% | 5.00%
Real estate securities | Maximum |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Dealer marks of securities (percent) | 72.00% | 72.00%
Carrying value for which dealer quotes have been received (percent) | 82.00% | 82.00%
Difference of internal valuation than dealer marks (percent) | 1.00% | 1.00%

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