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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