Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	$ 1,298	$ 1,372	$ 1,372	$ 1,286
Financial Guarantee Policies Paid in Installments
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	1,297	1,371
Deferred premium revenue	$ 1,663	$ 1,663
Weighted-average risk-free rate used to discount premiums	1.80%	1.60%
Weighted-average period of premiums receivable (in years)	12 years 10 months 24 days	12 years 8 months 12 days