Investments (Schedule Of Realized Gain (Loss)) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Realized gain (loss) related to certain investments
AFS securities. Gross OTTI		$ (16)	$ (7)	$ (20)
Gain (loss) on other investments	[1]	(16)	(13)	(12)
Total realized gain (loss) related to certain investments		(73)	(84)	(72)
Realized gain (loss) on the mark-to-market on certain instruments	[2]	(127)	4	(11)
Indexed annuity and IUL contracts net derivatives results:
Gross gain (loss)	[3]	(80)	(51)	(22)
Associated amortization of DAC, VOBA, DSI, and DFEL	[3]	2	12	(2)
Variable annuity net derivatives results:
Gross gain (loss)	[4]	(389)	295	(71)
Associated amortization of DAC, VOBA, DSI, and DFEL	[4]	57	(35)	8
Total realized gain (loss)		(610)	141	(170)
Certain Investments [Member]
Realized gain (loss) related to certain investments
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds		(13)	(22)	(21)
Fixed Maturity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains		45	38	19
AFS securities. Gross losses		(73)	(80)	(44)
AFS securities. Gross OTTI		16	7	20
Equity AFS Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains				$ 6
Equity Securities [Member]
Realized gain (loss) related to certain investments
Gain (loss) on other investments		$ (4)	$ (17)

[1] Includes market adjustments on equity securities still held of $(4) million and $(17) million for the years ended December 31, 2019 and 2018, respectively.

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

[3] Represents the net difference between the change in fair value of the index 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 options we may purchase or sell in the future to hedge contract holder index allocations applicable to future reset periods for our indexed annuity products.

[4] Includes the net difference in the change in embedded derivative reserves of our GLB riders and the change in the fair value of the derivative instruments we own to hedge the change in embedded derivative reserves on our GLB riders and the benefit ratio unlocking on our GLB and GDB riders, including the cost of purchasing the hedging instruments.