Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (2)	$ (3)	$ (5)	$ (63)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(6)	(5)	(13)	(8)
Total realized gain (loss) related to certain investments, pre-tax	[1]	(18)	(65)	(31)	(172)
Fixed maturity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[2]	3	7	11	61
AFS securities. Gross losses	[2]	(13)	(65)	(25)	(163)
Equity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains			2	1	2
AFS securities. Gross losses			$ (1)		$ (1)

[1] See "Realized Gain (Loss) Related to Certain Investments" section in Note 4.

[2] These amounts are represented net of related fair value hedging activity. See Note 5 for more information.