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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3	$ 42	$ 51	$ 368	$ 141
Transfers Out of Level 3	(369)	(286)	(666)	(815)
Transfers Into or Out of Level 3, Net	(327)	(235)	(298)	(674)
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	42	51	296	136
Transfers Out of Level 3	(54)		(216)	(171)
Transfers Into or Out of Level 3, Net	(12)	51	80	(35)
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			1
Transfers Out of Level 3			(10)	(7)
Transfers Into or Out of Level 3, Net			(9)	(7)
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			20
Transfers Out of Level 3	(73)	(173)	(196)	(396)
Transfers Into or Out of Level 3, Net	(73)	(173)	(176)	(396)
U.S. Government Bonds [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)
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 Into Level 3			18
Transfers Into or Out of Level 3, Net			18
Trading Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Into Level 3			33	5
Transfers Out of Level 3	(21)	(113)	(23)	(241)
Transfers Into or Out of Level 3, Net	(21)	$ (113)	10	$ (236)
Derivative Investments [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(216)		(216)
Transfers Into or Out of Level 3, Net	$ (216)		$ (216)