Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (68)	$ (9)	$ 3
Associated amortization expense of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(24)	(26)	(32)
Total realized gain (loss) related to certain investments	[1]	(250)	(88)	(18)
Fixed maturity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[2]	70	43	29
AFS securities. Gross losses	[2]	(234)	(99)	(23)
Equity AFS securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains		7	$ 3	$ 5
AFS securities. Gross losses		$ (1)

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

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