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Principles of Consolidation - Additional Information (Details) $ in Millions	3 Months Ended	12 Months Ended		72 Months Ended
	Dec. 31, 2018 USD ($) partnership	Dec. 31, 2018 USD ($) Entity	Dec. 31, 2017 Entity	Dec. 31, 2018 USD ($) Entity
Variable Interest Entity [Line Items]
Number of partnerships consolidated | partnership	2
Servicing asset, fair value	$ 300	$ 300		$ 300
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		8	7	44
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	$ 12	$ 12		$ 12
Sequoia Choice | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	196	196		196
Freddie Mac SLST | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	230	230		230
Servicing Investment | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Servicing asset, fair value	57	57		57
Freddie Mac K-Series | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	$ 126	$ 126		$ 126

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- Definition

Number Of Partnerships Consolidated

+ References

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- Definition

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

The net carrying amount of the consolidated Variable Interest Entity's assets and liabilities included in the reporting entity's statement of financial position.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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-Publisher FASB
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