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Principles of Consolidation - Additional Information (Details) $ in Millions	3 Months Ended			12 Months Ended		96 Months Ended
	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 partnership	Dec. 31, 2019 USD ($) entity	Dec. 31, 2018 partnership entity	Dec. 31, 2019 USD ($) entity
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership			2		2
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, ownership interest rate	80.00%
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred | entity				5	8	48
Gain (loss) on securitization of financial assets		$ 4
Loan acquisition, aggregate amount acquired				$ 39
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	$ 6			6		$ 6
Sequoia Choice | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	256			256		256
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	451			451		451
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	253			253		253
CoreVest LLC | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	195			195		195
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Servicing asset, fair value	$ 53			$ 53		$ 53

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Loan Acquisition, Aggregate Amount Acquired

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Number of Securitization Entities to which Asset Transferred

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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