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Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable $ 1,568 $ 1,551 $ 1,450 $ 1,468
Financial Guarantee Policies Paid in Installments        
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable 1,567 1,550    
Deferred premium revenue $ 1,870 $ 1,901    
Weighted-average risk-free rate used to discount premiums 2.50% 2.50%    
Weighted-average period of premiums receivable (in years) 12 years 2 months 12 days 12 years 3 months 18 days