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Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable $ 1,551 $ 1,468 $ 1,298 $ 1,372
Financial Guarantee Insurance Contract Unearned Premium Revenue Received Over Contract Period Statement Of Financial Position Extensible Enumeration Not Disclosed Flag Deferred premium revenue Deferred premium revenue    
Financial Guarantee Policies Paid in Installments        
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable $ 1,550 $ 1,467    
Deferred premium revenue $ 1,901 $ 1,768    
Weighted average risk-free rate used to discount premiums 2.50% 2.10%    
Weighted average period of premiums receivable (in years) 12 years 3 months 18 days 12 years 6 months