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	$ (15)	$ (7)	$ (20)
Gain (loss) on other investments	(15)	(15)	(10)
Associated amortization of DAC, VOBA, DSI and DFEL and changes in other contract holder funds	(13)	(22)	(21)
Total realized gain (loss) related to certain investments	(69)	(88)	(71)
Realized gain (loss) on the mark-to-market on certain instruments	(426)	251	(155)
Indexed annuity and IUL contracts net derivatives results:
Gross gain (loss)	(80)	(51)	(22)
Associated amortization of DAC, VOBA, DSI, and DFEL	2	12	(2)
Variable annuity net derivatives results:
Gross gain (loss)	(223)	(184)	(174)
Associated amortization of DAC, VOBA, DSI, and DFEL	(32)	(32)	(32)
Total realized gain (loss)	(828)	(92)	(456)
Fixed Maturity Securities [Member]
Realized gain (loss) related to certain investments
AFS securities. Gross gains	44	36	17
AFS securities. Gross losses	(70)	(80)	(43)
AFS securities. Gross OTTI	(15)	(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)