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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, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable $ 1,472 $ 1,468 $ 1,417 $ 1,298
Financial Guarantee Policies Paid in Installments        
Financial Guarantee Insurance Premiums [Line Items]        
Premiums receivable, net of commissions payable 1,471 1,467    
Deferred premium revenue $ 1,815 $ 1,768    
Weighted-average risk-free rate used to discount premiums 2.30% 2.10%    
Weighted-average period of premiums receivable (in years) 12 years 6 months 12 years 6 months