Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 11	$ 117	$ 80	$ 336
Transfers Out of Level 3	(159)	(124)	(530)	(303)
Transfers Into or Out of Level 3, Net	(148)	(7)	(450)	33
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	11	116	54	277
Transfers Out of Level 3	(42)	(57)	(125)	(88)
Transfers Into or Out of Level 3, Net	(31)	59	(71)	189
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3				15
Transfers Out of Level 3		(15)		(21)
Transfers Into or Out of Level 3, Net		(15)		(6)
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3				5
Transfers Into or Out of Level 3, Net				5
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3			(12)
Transfers Into or Out of Level 3, Net			(12)
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3				3
Transfers Out of Level 3		(14)	(21)	(59)
Transfers Into or Out of Level 3, Net		(14)	(21)	(56)
CLOs [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3				30
Transfers Out of Level 3	(111)	(28)	(204)	(116)
Transfers Into or Out of Level 3, Net	(111)	(28)	(204)	(86)
State And Municipal Bonds [Member] | Fixed Maturity AFS 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)
Transfers Into or Out of Level 3, Net				1
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(9)		(14)
Transfers Into or Out of Level 3, Net		(9)		(14)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(1)	(162)	(1)
Transfers Into or Out of Level 3, Net		(1)	(162)	(1)
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		1		4
Transfers Out of Level 3	(6)		(6)	(3)
Transfers Into or Out of Level 3, Net	$ (6)	$ 1	(6)	$ 1
Equity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			26
Transfers Into or Out of Level 3, Net			$ 26