Investments (Realized Gain (Loss) Related To Certain Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Realized gain (loss) related to certain investments
Gross OTTI		$ (7)	$ (20)	$ (100)
Gain (loss) on other investments	[1]	(15)	(10)	(62)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(22)	(21)	(24)
Total realized gain (loss) related to certain investments, pre-tax		(88)	(71)	(241)
Realized gain (loss) on the mark-to-market on certain instruments	[2]	251	(155)	(66)
Indexed annuity and IUL contracts net derivatives results:
Gross gain (loss)	[3]	(51)	(22)	(1)
Associated amortization of DAC, VOBA, DSI, and DFEL	[3]	12	(2)	(4)
GLB Fees Ceded To LNBAR And Attributed Fees:
Gross gain (loss)		(184)	(174)	(166)
Associated amortization of DAC, VOBA, DSI, and DFEL		(32)	(32)	(32)
Total realized gain (loss)		(92)	(456)	(510)
Fixed Maturity Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	[4]	36	17	65
AFS securities. Gross losses	[4]	(80)	(43)	(128)
Gross OTTI	[4]	(7)	(20)	(99)
Equity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains			$ 6	8
Gross OTTI				$ (1)
Equity Securities [Member]
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (17)

[1] Includes market adjustments on equity securities still held of $(17) million for the year ended December 31, 2018.

[2] Represents changes in the fair values of certain derivative investments (not including those associated with our variable and indexed annuity and indexed universal life insurance ("IUL") contracts net derivatives results), reinsurance related embedded derivatives and trading securities.

[3] Represents the net difference between the change in fair value of the S&P 500 Index® (“S&P 500”) call options that we hold and the change in the fair value of the embedded derivative liabilities of our indexed annuity and IUL contracts along with changes in the fair value of embedded derivative liabilities related to index call options we may purchase in the future to hedge contract holder index allocations applicable to future reset periods for our indexed annuity products

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