Investments (Net Investment Income on Leveraged and Direct Financing Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investments, All Other Investments [Abstract]
Leveraged Leases, Income Statement, Income from Leveraged Leases	$ 35	$ 34	$ 39
Leveraged Leases, Income Statement, Income Tax Expense on Leveraged Leases	(7)	(7)	(8)
Leveraged Leases, Income (Loss)	$ 28	$ 27	$ 31
Direct Financing Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Total revenues	Total revenues	Total revenues
Direct Financing Leases Income Statement Tax Expense on Direct Financing Leases	$ (27)	$ (20)	$ (22)
Direct Financing Leases Income Statement Net Income from Direct Financing Leases	$ 102	$ 76	$ 84