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Fair Value Measurements - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) mortgage_loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Mortgage loans held for investment | mortgage_loan | 0
Mortgage Loans Held for Investment |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Transfers to mortgage loans held for sale | $ | $ (12)

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Mortgage Loans Held For Sale + References No definition available. + Details
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- Definition Mortgage Loans Held For Investment + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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. + Details
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- Details
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