Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Realized gain (loss) related to certain investments
Gain (loss) on other investments	[1]	$ 1		$ 6	$ (6)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(5)	$ (5)	(16)	(17)
Total realized gain (loss) related to certain investments, pre-tax	[2]	(11)	(19)	(45)	(49)
Fixed Maturity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[3]	14	7	30	19
AFS securities. Gross losses	[3]	(21)	(22)	(65)	(47)
Equity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains			$ 1		$ 2
Equity Securities [Member]
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ 1		$ 2

[1] Includes market adjustments on equity securities still held of less than $1 million and $2 million for the three and nine months ended September 30, 2018, respectively.

[2] See "Realized Gain (Loss) Related to Certain Investments" section in Note 5.

[3] These amounts are represented net of related fair value hedging activity. See Note 6 for more information.