Investments (Credit Loss Expense Incurred) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ (26)	$ (16)	$ (7)
Associated amortization of DAC, VOBA, DSI and DFEL	1	1
Net credit loss expense recognized in net income (loss)	(25)	(15)	(7)
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	(25)	(14)	(5)
Fixed Maturity AFS Securities [Member] | RMBS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ (1)	(1)	(1)
Fixed Maturity AFS Securities [Member] | ABS [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)		$ (1)	$ (1)