Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Document Period End Date	Sep. 30, 2022
Loans Receivable, Gross, Commercial, Real Estate	$ 6,613	$ 6,329
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Due within five years
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,504	$ 2,660
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	37.80%	42.00%
Due after five years through ten years
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 3,047	$ 2,593
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	46.00%	41.00%
Due after ten years
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,062	$ 1,076
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	16.20%	17.00%