Investments (Credit Loss Expense Incurred) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ (1)	$ (5)	$ (17)	$ (11)
Intent to sell impairments	(467)		(1,091)
Intent to sell impairments, unrealized gain position			208
Corporate Bonds [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	(1)		(18)	(2)
Intent to sell impairments	(422)		(941)
State And Municipal Bonds [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Intent to sell impairments	(28)		(48)
RMBS [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)		(2)	1	(4)
Intent to sell impairments	(9)		(28)
CMBS [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Intent to sell impairments	(5)		(36)
ABS [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)		$ (3)		$ (5)
Intent to sell impairments	(2)		(37)
Hybrid And Redeemable Preferred Securities [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Intent to sell impairments	$ (1)		$ (1)