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Principles of Consolidation - Additional Information (Details) $ in Millions	12 Months Ended		60 Months Ended
	Dec. 31, 2017 USD ($) Entity	Dec. 31, 2016 Entity	Dec. 31, 2017 USD ($) Entity
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Number of securitization entities to which asset transferred | Entity	7	3	36
Legacy Sequoia | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	$ 14		$ 14
Sequoia Choice | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
VIE, carrying amount, assets and liabilities, net	$ 78		$ 78

X

- Definition

Number of Securitization Entities to which Asset Transferred

+ References

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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.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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