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)	$ (2)	$ (5)	$ (22)	$ (13)
Associated amortization of DAC, VOBA, DSI and DFEL	1	1	1	1
Net credit loss expense recognized in net income (loss)	(1)	(4)	(21)	(12)
Corporate Bonds [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Gross credit loss expense recognized in net income (loss)		$ (5)	(20)	(11)
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)
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)