Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	$ 164	$ 105
Transfers Out of Level 3	(25)	(6)
Transfers In or Out of Level 3, Net	139	99
Corporate bonds [Member] | Fixed maturity AFS securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	164	80
Transfers Out of Level 3	(24)	(1)
Transfers In or Out of Level 3, Net	140	79
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 In to Level 3		25
Transfers Out of Level 3		(5)
Transfers In or Out of Level 3, Net		$ 20
Trading securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3	(1)
Transfers In or Out of Level 3, Net	$ (1)