Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 3	$ 19	$ 69	$ 219
Transfers Out of Level 3	(73)	(126)	(371)	(179)
Transfers Into or Out of Level 3, Net	(70)	(107)	(302)	40
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	3	1	43	161
Transfers Out of Level 3	(50)	(2)	(83)	(31)
Transfers Into or Out of Level 3, Net	(47)	(1)	(40)	130
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		15
Transfers Out of Level 3		(1)		(6)
Transfers Into or Out of Level 3, Net		14		9
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		3
Transfers Out of Level 3	(21)	(41)	(21)	(45)
Transfers Into or Out of Level 3, Net	(21)	(38)	(21)	(42)
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	(2)	(73)	(93)	(88)
Transfers Into or Out of Level 3, Net	$ (2)	(73)	(93)	(58)
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)		(1)
Transfers Into or Out of Level 3, Net		(1)		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		(5)		(5)
Transfers Into or Out of Level 3, Net		(5)		(5)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3			(162)
Transfers Into or Out of Level 3, Net			(162)
Trading 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		(3)		$ (3)
Transfers Into or Out of Level 3, Net		$ (3)
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