Fair Value of Financial Instruments (Components Of The Transfers In And Out Of Level 3) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	$ 613	$ 284	$ 1,856
Transfers Out of Level 3	(997)	(196)	(2,196)
Transfers In or Out of Level 3, Net	(384)	88	(340)
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	605	224	475
Transfers Out of Level 3	(224)	(166)	(456)
Transfers In or Out of Level 3, Net	381	58	19
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	4		26
Transfers Out of Level 3	(28)		(4)
Transfers In or Out of Level 3, Net	(24)		22
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	(8)
Transfers In or Out of Level 3, Net	(8)
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
RMBS [Member] | Fixed maturity AFS securities [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net [Abstract]
Transfers In to Level 3	3
Transfers Out of Level 3	(67)
Transfers In or Out of Level 3, Net	(64)
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	(31)
Transfers In or Out of Level 3, Net	(31)		6
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	(621)	(16)	(4)
Transfers In or Out of Level 3, Net	(621)	(12)	49
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
Transfers Out of Level 3		(5)	(22)
Transfers In or Out of Level 3, Net		43	(5)
Equity AFS 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	1	4	10
Transfers Out of Level 3	(18)	$ (4)	(11)
Transfers In or Out of Level 3, Net	$ (17)		(1)
Derivative investments [Member]
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 reserves embedded derivatives [Member] | 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)
GLB reserves embedded derivatives [Member] | 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