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Fair Value of Financial Instruments - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Securities
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 68
Residential loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	2,630
Business purpose residential loans
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 467
Real estate securities | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Dealer marks of securities (as a percent)	78.00%
Carrying value for which dealer quotes have been received (as a percent)	91.00%
Servicer advance investments
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 159
Excess MSR
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	9
Shared home appreciation options
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value option elected aggregate carrying amount, asset	$ 4
Mortgage servicing rights | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Difference of internal valuation than dealer marks (as a percent)	5.00%

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- Definition

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

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- Definition

Percentage Difference Of Internal Valuation Than Dealer Marks

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- Definition

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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