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Fair Value of Financial Instruments (Schedule Of Investment Holdings Movements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	$ 2,366	$ 2,786	$ 2,399
Sales	(809)	(132)	256
Maturities	(574)	(434)	(429)
Settlements	(1,135)	(177)	(104)
Calls	(132)	(30)	(77)
Total	(284)	2,013	2,045
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	1,126	1,170	947
Sales	(250)	(28)	(161)
Maturities	(43)	(78)	(3)
Settlements	(237)	(156)	(277)
Calls	(132)	(30)	(77)
Total	464	878	429
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Sales			(5)
Total			(5)
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Maturities	(20)	(25)
Total	(20)	(25)
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		21	7
Total		21	7
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		7	39
Settlements		(2)	(4)
Total		5	35
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	572		240
Sales			(17)
Settlements	(76)
Total	496		223
CLOs [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances		646
Sales		(8)
Settlements		(19)
Total		619
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	14
Sales	(4)
Total	10
Mortgage Loans On Real Estate [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	71
Sales	(15)
Total	56
Trading Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	300	872	54
Sales	(126)		(24)
Maturities	(40)
Settlements	(166)	(22)
Total	(32)	850	30
Equity Securities [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	22	50	1
Sales	(2)	(33)	(1)
Total	20	17
Derivative Investments [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	520	555	365
Sales	(412)	(63)	464
Maturities	(471)	(331)	(426)
Total	(363)	161	403
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	25	56	1,030
Settlements	(940)	(189)	(22)
Total	(915)	(133)	1,008
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share Unobservable Input Investment Holdings Movements [Abstract]
Issuances	(284)	(591)	(284)
Settlements	$ 284	211	199
Total		$ (380)	$ (85)

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