Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 105	$ 518	$ 613
Transfers Out of Level 3	(567)	(331)	(997)
Transfers Into or Out of Level 3, Net	(462)	187	(384)
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	78	458	605
Transfers Out of Level 3	(140)	(88)	(224)
Transfers Into or Out of Level 3, Net	(62)	370	381
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		16	4
Transfers Out of Level 3	(2)	(21)	(28)
Transfers Into or Out of Level 3, Net	(2)	(5)	(24)
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 Out of Level 3			(8)
Transfers Into or Out of Level 3, Net		5	(8)
RMBS [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	(12)	(11)	(67)
Transfers Into or Out of Level 3, Net	(12)	(11)	(64)
CMBS [Member] | Fixed Maturity AFS 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	(40)	(59)	(31)
Transfers Into or Out of Level 3, Net	(39)	(56)	(31)
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	(204)	(131)	(621)
Transfers Into or Out of Level 3, Net	(204)	(101)	(621)
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		(14)
Transfers Into or Out of Level 3, Net		(14)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(162)	(1)
Transfers Into or Out of Level 3, Net	(162)	(1)
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3		4	1
Transfers Out of Level 3	(7)	(5)	(18)
Transfers Into or Out of Level 3, Net	(7)	$ (1)	$ (17)
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