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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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Fair Value, Option, Assets, Aggregate Carrying Amount During Period

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Percentage Difference Of Internal Valuation Than Dealer Marks

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Percentage of Carrying Value for Which Dealer Quotes Were Received on Securities

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Percentage of Third-party Dealer Quotes Received on Securities.

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