Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (3)	$ (60)
Associated amortization expense of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(7)	(3)
Total realized gain (loss) related to certain investments	[1]	(13)	(107)
Fixed maturity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[2]	8	54
AFS securities. Gross losses	[2]	(12)	(98)
Equity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains		1
AFS securities. Gross losses

[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.