Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Realized gain (loss) related to certain investments
Gain (loss) on other investments	[1]	$ 4	$ (2)	$ 6	$ (5)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(6)	(6)	(11)	(13)
Total realized gain (loss) related to certain investments, pre-tax	[2]	(13)	(18)	(34)	(31)
Fixed Maturity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[3]	1	3	16	11
AFS securities. Gross losses	[3]	(12)	$ (13)	(45)	(25)
Equity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains					$ 1
Equity Securities [Member]
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ 2		$ 2

[1] Includes market adjustments on equity securities still held of $2 million for the three and six months ended June 30, 2018.

[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.