Contracts Accounted for as Insurance - Selected Information for Policies Paid In Installments (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	$ 1,178	$ 1,372	$ 1,378	$ 1,372
Financial Guarantee Policies Paid in Installments
Financial Guarantee Insurance Premiums [Line Items]
Premiums receivable, net of commissions payable	1,177	1,371
Deferred premium revenue	$ 1,618	$ 1,663
Weighted-average risk-free rate used to discount premiums	1.70%	1.60%
Weighted-average period of premiums receivable (in years)	12 years 10 months 24 days	12 years 8 months 12 days