Investments (Equity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Unrealized Gains (Losses)	$ 277	$ 2,256
Equity securities	973	1,269
Common Stock
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	610	784
Equity Securities, FV-NI, Unrealized Gains (Losses)	183	295
Equity securities	793	1,079
Non-redeemable Preferred Stock
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	188	189
Equity Securities, FV-NI, Unrealized Gains (Losses)	(8)	1
Equity securities	180	190
Equity Securities
Debt and Equity Securities, FV-NI [Line Items]
Equity Securities, FV-NI, Cost	798	973
Equity Securities, FV-NI, Unrealized Gains (Losses)	175	296
Equity securities	$ 973	$ 1,269