Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 192	$ 105	$ 516
Transfers Out of Level 3	(1,014)	(556)	(330)
Total Transfers Into or (Out) of Level 3	(822)	(451)	186
Corporate Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	173	78	458
Transfers Out of Level 3	(222)	(130)	(88)
Total Transfers Into or (Out) of Level 3	(49)	(52)	370
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	5		5
Total Transfers Into or (Out) of Level 3	5		5
RMBS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(17)	(12)	(10)
Total Transfers Into or (Out) of Level 3	(17)	(12)	(10)
CMBS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		1	3
Transfers Out of Level 3	(7)	(40)	(59)
Total Transfers Into or (Out) of Level 3	(7)	(39)	(56)
CLOs [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	9		44
Transfers Out of Level 3	(495)	(206)	(152)
Total Transfers Into or (Out) of Level 3	(486)	(206)	(108)
State And Municipal Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			2
Transfers Out of Level 3			(1)
Total Transfers Into or (Out) of Level 3			1
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3			(14)
Total Transfers Into or (Out) of Level 3			(14)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(161)	(1)
Total Transfers Into or (Out) of Level 3		(161)	(1)
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	5		4
Transfers Out of Level 3	(273)	(7)	(5)
Total Transfers Into or (Out) of Level 3	$ (268)	(7)	$ (1)
Equity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		26
Total Transfers Into or (Out) of Level 3		$ 26