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Fair Value of Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($)
Subordinate Securities |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value option elected aggregate carrying amount, asset | $ 142
Residential loans |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value option elected aggregate carrying amount, asset | 1,090
Mortgage servicing rights |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value option elected aggregate carrying amount, asset | $ 7
Real estate securities | Maximum |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Dealer marks of securities (as a percent) | 73.00%
Carrying value for which dealer quotes have been received (as a percent) | 79.00%
Difference of internal valuation than dealer marks (as a percent) | 1.00%
Residential Senior Securities |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair value option elected aggregate carrying amount, asset | $ 3
Mortgage servicing rights | Maximum |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Difference of internal valuation than dealer marks (as a percent) | 1.00%

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