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 In to Level 3	$ 105	$ 516	$ 620
Transfers Out of Level 3	(556)	(330)	(962)
Total Transfers Into or (Out) of Level 3	(451)	186	(342)
Corporate Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	78	458	605
Transfers Out of Level 3	(130)	(88)	(203)
Total Transfers Into or (Out) of Level 3	(52)	370	402
ABS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		14	3
Transfers Out of Level 3	(2)	(21)	(28)
Total Transfers Into or (Out) of Level 3	(2)	(7)	(25)
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		5	9
Transfers Out of Level 3			(7)
Total Transfers Into or (Out) of Level 3		5	2
RMBS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3			2
Transfers Out of Level 3	(12)	(10)	(54)
Total Transfers Into or (Out) of Level 3	(12)	(10)	(52)
CMBS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	1	3
Transfers Out of Level 3	(40)	(59)	(31)
Total Transfers Into or (Out) of Level 3	(39)	(56)	(31)
CLOs [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		30
Transfers Out of Level 3	(204)	(131)	(621)
Total Transfers Into or (Out) of Level 3	(204)	(101)	(621)
State And Municipal Bonds [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to 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 In to Level 3		4	1
Transfers Out of Level 3	(7)	(5)	(18)
Total Transfers Into or (Out) of Level 3	(7)	$ (1)	$ (17)
Equity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	26
Total Transfers Into or (Out) of Level 3	$ 26