Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	$ 284	$ 1,856	$ 401
Transfers Out of Level 3	(196)	(2,196)	(581)
Transfers In or Out of Level 3, Net	88	(340)	(180)
Transfers between Levels 1 and 2	172
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	224	475	373
Transfers Out of Level 3	(166)	(456)	(459)
Transfers In or Out of Level 3, Net	58	19	(86)
ABS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		26
Transfers Out of Level 3		(4)	(34)
Transfers In or Out of Level 3, Net		22	(34)
Foreign government 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	4	25
Transfers Out of Level 3	(4)
Transfers In or Out of Level 3, Net		25
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		6
Transfers Out of Level 3			(8)
Transfers In or Out of Level 3, Net		6	(8)
CLOs [Member] | Fixed Maturity AFS Securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	4	53
Transfers Out of Level 3	(16)	(4)	(28)
Transfers In or Out of Level 3, Net	(12)	49	(28)
State and municipal 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		(29)
Transfers In or Out of Level 3, Net		(29)
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	48	17	20
Transfers Out of Level 3	(5)	(22)	(50)
Transfers In or Out of Level 3, Net	43	(5)	(30)
Available-for-sale equity 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)
Trading securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	4	10	8
Transfers Out of Level 3	$ (4)	(11)	(2)
Transfers In or Out of Level 3, Net		(1)	$ 6
Derivative investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(426)
Transfers In or Out of Level 3, Net		(426)
GLB embedded derivative reserves | Other Liabilities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3		1,244
Transfers In or Out of Level 3, Net		1,244
GLB embedded derivative reserves | Future contract benefits [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers Out of Level 3		(1,244)
Transfers In or Out of Level 3, Net		$ (1,244)