Fair Value Measurements (Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique	Actuarial model	[1]
Minimum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	1.00%	[1]
Significant Unobservable Inputs Annuitization rate	0.00%	[1]
Maximum
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Significant Unobservable Inputs Lapse rate	30.00%	[1]
Significant Unobservable Inputs Annuitization rate	55.00%	[1]
Guaranteed Minimum Income Benefit
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value	$ 193	[1]
Balance - beginning of year, liabilities	1,119	[2],[3]	1,319	[4]	507
Transfers Into Level 3, liabilities		[2]	0		0
Transfers out of Level 3, liabilities		[2]	0		0
Change in Net Unrealized Gains (Losses) included in OCI, Liabilities		[2]	0
Net Realized Gains/Losses, Liabilities	(926)	[2]	(200)		(812)
Purchased, liabilities		[2]	0		0
Sales, liabilities		[2]	0		0
Settlements, liabilities		[2]	0		0
Balance - end of year, liabilities	193	[2]	1,119	[2],[3]	1,319	[4]
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Liabilities	(926)	[2]	(200)		812
Equity securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets	3		13		13
Transfers into Level 3, assets	8		2
Transfers out of Level 3, assets	(1)		(11)
Change in Net Unrealized Gains (Losses) included in OCI, Assets	(6)				1
Net Realized Gains/Losses, Assets	(4)				(4)
Purchased, assets	2		4		5
Sales, assets	(6)		(5)		(8)
Settlements, assets
Balance, end of year, assets	4		3		13
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets
Short-term investments
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets
Transfers into Level 3, assets	8
Transfers out of Level 3, assets	(2)
Change in Net Unrealized Gains (Losses) included in OCI, Assets
Net Realized Gains/Losses, Assets
Purchased, assets	3
Sales, assets	(1)
Settlements, assets	(1)
Balance, end of year, assets	7
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets
Other Long-term Investments [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets	2,252		1,877		1,432
Transfers into Level 3, assets			53
Transfers out of Level 3, assets
Change in Net Unrealized Gains (Losses) included in OCI, Assets	45		(55)		(93)
Net Realized Gains/Losses, Assets	2		7		(3)
Purchased, assets	551		520		602
Sales, assets	(10)		(9)		(55)
Settlements, assets	(396)		(237)		(192)
Balance, end of year, assets	2,440		2,252		1,877
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	2		7		3
Other Derivative Instruments Fair Value [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets			3		4
Transfers into Level 3, assets			0		0
Transfers out of Level 3, assets			0
Change in Net Unrealized Gains (Losses) included in OCI, Assets			0
Net Realized Gains/Losses, Assets			4		(2)
Purchased, assets			3		0
Sales, assets			0
Settlements, assets			(2)		(3)
Balance, end of year, assets					3
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets			0		1
Fixed maturities available for sale | U.S. Treasury and agency
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets			5
Transfers into Level 3, assets
Transfers out of Level 3, assets			(4)
Change in Net Unrealized Gains (Losses) included in OCI, Assets
Net Realized Gains/Losses, Assets
Purchased, assets					5
Sales, assets
Settlements, assets			(1)
Balance, end of year, assets					5
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets
Fixed maturities available for sale | Foreign Government Debt Securities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets	60		33		26
Transfers into Level 3, assets	36		49		9
Transfers out of Level 3, assets	(54)		(13)		(18)
Change in Net Unrealized Gains (Losses) included in OCI, Assets			1		1
Net Realized Gains/Losses, Assets	(1)				0
Purchased, assets	24		46		23
Sales, assets	(21)		(53)		(3)
Settlements, assets	(2)		(1)		(3)
Balance, end of year, assets	44		60		33
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets					0
Fixed maturities available for sale | Corporate securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets	102		134		115
Transfers into Level 3, assets	47		37		42
Transfers out of Level 3, assets	(31)		(46)		(4)
Change in Net Unrealized Gains (Losses) included in OCI, Assets			(6)		2
Net Realized Gains/Losses, Assets	2		1		(3)
Purchased, assets	75		24		32
Sales, assets	(7)		(19)		(27)
Settlements, assets	(18)		(33)		(19)
Balance, end of year, assets	166		102		134
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets	2				0
Fixed maturities available for sale | Mortgage backed-securities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets	13		28		39
Transfers into Level 3, assets			22		4
Transfers out of Level 3, assets			(35)		(48)
Change in Net Unrealized Gains (Losses) included in OCI, Assets
Net Realized Gains/Losses, Assets
Purchased, assets			9		59
Sales, assets	(3)		(7)		(17)
Settlements, assets	(2)		(4)		(9)
Balance, end of year, assets	8		13		28
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets
Fixed maturities available for sale | States, municipalities, and political subdivisions
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance, beginning of year, assets			1		2
Transfers into Level 3, assets			1
Transfers out of Level 3, assets			(1)
Change in Net Unrealized Gains (Losses) included in OCI, Assets
Net Realized Gains/Losses, Assets
Purchased, assets					0
Sales, assets
Settlements, assets			(1)		(1)
Balance, end of year, assets					1
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date, Assets

[1] Discussion of the most significant inputs used in the fair value measurement of GLB and the sensitivity of those assumptions is included within Note 4 a) Guaranteed living benefits.

[2] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. Refer to Note 5 c) for additional information.

[3] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets.

[4] Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value. Excluded from the table above is the portion of the GLB derivative liability classified as Future policy benefits in the consolidated balance sheets. The liability for GLB reinsurance was $1.5 billion at December 31, 2011 and $648 million at December 31, 2010, which includes a fair value derivative adjustment of $1.3 billion and $507 million, respectively.