Investments (Credit Loss Expense Incurred) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ (17)	$ (1)
Corporate Bonds [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	(18)	1
RMBS [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ 1	(1)
ABS [Member]
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)		$ (1)