Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (9)	$ 3	$ (3)
Associated amortization expense of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(26)	(32)	(28)
Total realized gain (loss) related to certain investments	[1]	(88)	(18)	(98)
Fixed Maturity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[2]	43	29	21
AFS securities. Gross losses	[2]	(99)	(23)	(94)
Available-for-sale equity securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains		$ 3	$ 5	8
AFS securities. Gross losses				$ (2)

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

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