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Debt - Mortgages Segment, Master Repurchase Agreements Narrative (Detail) - Mortgages - USD ($) | Dec. 31, 2022 | Mar. 18, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | $ 250,000,000 |  |
Credit Suisse AG, Cayman Islands |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | 23,000,000 |  | $ 77,000,000
Credit Suisse AG, Cayman Islands | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 100,000,000 | $ 100,000,000 |
Credit Suisse and Citibank, N.A |  |  |
Debt Instrument [Line Items] |  |  |
Short-term debt | $ 28,000,000 |  | $ 87,000,000

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