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Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Loss And Loss Adjustment Expense Reserves [Line Items]        
Impact of VIE Consolidation on Gross Loss and Loss Reserves $ 0 $ 292    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Beginning balance of net loss and loss expense reserves 419 (578)    
Current Year Claims and Claims Adjustment Expense 2 1    
Prior Year Claims and Claims Adjustment Expense 16 23    
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 18 24    
Claim and loss expense payments, net of subrogation and reinsurance 0 0    
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance 141 150    
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid (141) (150)    
Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) 0 (1)    
Liability for Unpaid Claims and Claims Adjustment Expense, Net 578 (404) $ 419 $ (578)
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 127 49 115 56
Policyholder Benefits and Claims Incurred, Ceded 20 7    
Net Incurred RMBS Subrogation Recoveries 0 (224)    
Ceded Loss And Loss Expenses Paid Not Yet Recovered   0    
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables 705 $ (647) 534 $ (522)
Financial Guarantee        
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Ceded Loss And Loss Expenses Paid Not Yet Recovered 0   0  
Loss Reserves Ceded To Reinsurers $ 34   $ 33