Investments (Credit Loss Expense Incurred) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)	$ (3)	$ (4)	$ (21)	$ (12)
Associated amortization of DAC, VOBA, DSI and DFEL	1		1
Net credit loss expense recognized in net income (loss)	(2)	(4)	(20)	(12)
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)	(1)	$ (4)	(19)	(10)
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)	$ (1)