Investments (Current Equity Securities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Equity Securities [Line Items]
Equity Securities	$ 953	$ 1,881
Exchange Traded Funds [Member]
Equity Securities [Line Items]
Equity Securities	822	1,750
Common Equity Securities [Member]
Equity Securities [Line Items]
Equity Securities	43	42
Private Equity Securities [Member]
Equity Securities [Line Items]
Equity Securities	$ 88	$ 89