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Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable $ 1,417 $ 1,298 $ 1,235 $ 1,372
Financial Guarantee Policies Paid in Installments        
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable 1,416 1,297    
Deferred premium revenue $ 1,721 $ 1,663    
Weighted-average risk-free rate used to discount premiums 1.90% 1.80%    
Weighted-average period of premiums receivable (in years) 12 years 4 months 24 days 12 years 10 months 24 days