Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	$ (94)		$ 96
Foreign Exchange Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Notional Value Payment Provision	1,469				1,202
Net realized gains (losses)	(3)		5
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(22)		7
Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Notional Value Payment Provision	272				254
Net realized gains (losses)	0		6
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	327				321
Derivative Instruments Notional Value Payment Provision	6,604				6,287
Net realized gains (losses)	(25)		18
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value					0	[1]
Derivative Instruments Notional Value Payment Provision	321	[1]			277	[1]
Net realized gains (losses)	(48)	[2]	328	[2]
Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value					0	[3]
Derivative Instruments Notional Value Payment Provision	1,453	[3]			1,692	[3]
Net realized gains (losses)	(17)	[4]	(237)	[4]
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value					6	[3]
Derivative Instruments Notional Value Payment Provision	250	[3]			250	[3]
Net realized gains (losses)	(2)	[4]	(13)	[4]
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(69)		78
Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Notional Value Payment Provision	64				8
Net realized gains (losses)	(2)		0
Balance Sheet Location Fixed Maturities Available For Sale [Member] | Convertibles and Bonds with Warrants Attached [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	319				302
Balance Sheet Location Accounts Payable [Member] | Foreign Exchange Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	(4)				(4)
Balance Sheet Location Accounts Payable [Member] | Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	(6)				(6)
Balance Sheet Location Accounts Payable [Member] | Single-Stock Future [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	(12)	[3]			(60)	[3]
Balance Sheet Location Accounts Payable [Member] | Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	0	[3]			0	[3]
Balance Sheet Location Accounts Payable [Member] | Other Derivatives [Member]
Commitments Contingencies And Guarantees [Line Items]
Derivative Instruments Fair Value	$ (2)				$ (2)

[1] (3) Includes both future policy benefits reserves and fair value derivative adjustment. Refer to Note 5 for additional information. Note that the payment provision related to GLB is the net amount at risk. The concept of a notional value does not apply to the GLB reinsurance contracts.

[2] Excludes foreign exchange gains (losses) related to GLB.

[3] (2) Related to GMDB and GLB blocks of business.

[4] Related to GMDB and GLB blocks of business.