Investments (Net Investment Income on Leveraged and Direct Financing Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, All Other Investments [Abstract]
Leveraged Leases, Income Statement, Income from Leveraged Leases	$ 34	$ 39	$ 48
Leveraged Leases, Income Statement, Income Tax Expense on Leveraged Leases	(7)	(8)	(10)
Leveraged Leases, Income (Loss)	27	31	38
Direct Financing Lease, Lease Income	96	106	109
Direct Financing Leases Income Statement Tax Expense on Direct Financing Leases	(20)	(22)	(23)
Direct Financing Leases Income Statement Net Income from Direct Financing Leases	$ 76	$ 84	$ 86