Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 6,653	$ 6,329
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Mortgage Loans On Real Estate Due One Year Through Five Years [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,652	$ 2,660
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	39.90%	42.00%
Mortgage Loans On Real Estate Due After Five Years [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 2,930	$ 2,593
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	44.00%	41.00%
Mortgage Loans On Real Estate Due After Ten Years [Member]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans Receivable, Gross, Commercial, Real Estate	$ 1,071	$ 1,076
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	16.10%	17.00%