Investments (Mortgage Loans by Maturity Date) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 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	Jun. 30, 2022
Loans Receivable, Gross, Commercial, Real Estate	$ 6,594	$ 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	$ 2,578	$ 2,660
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	39.10%	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	$ 2,759	$ 2,593
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	41.80%	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	$ 1,257	$ 1,076
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	19.10%	17.00%