Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	$ 83	$ 66
Transfers Out of Level 3	(249)	(287)
Total Transfers Into or (Out) of Level 3	(166)	(221)
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	83	40
Transfers Out of Level 3	(100)	(23)
Total Transfers Into or (Out) of Level 3	(17)	17
RMBS [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(7)	(12)
Total Transfers Into or (Out) of Level 3	(7)	(12)
CLOs [Member] | Fixed Maturity Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(105)	(91)
Total Transfers Into or (Out) of Level 3	(105)	(91)
Equity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(161)
Total Transfers Into or (Out) of Level 3		(161)
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(37)
Total Transfers Into or (Out) of Level 3	$ (37)
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