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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

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- Definition Number of Securitization Entities to which Asset Transferred + References No definition available. + Details
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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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- Details
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- Details
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- Details
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- Details
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