Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	$ (930)		$ (139)
Foreign Currency Forward Contracts [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	6		21
All Other Futures Contracts And Options [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(98)		29
Convertible Bonds [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(50)		7
To Be Announced Mortgage-Backed Securities [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(1)		1
Investment And Embedded Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(143)		58
Guaranteed Living Benefits [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(779)	[1]	(28)	[1]
Future Contracts On Equities [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(12)	[2]	(140)	[2]
Options On Equity Market Indices [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	8	[2]	(10)	[2]
Interest Rate Swaps [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)			(21)
Credit Default Swaps [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	(4)		1
Other [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)			1
Guaranteed Living Benefit And Other Derivative Instruments [Member]
Commitments Contingencies And Guarantees [Line Items]
Net realized gains (losses)	$ (787)		$ (197)

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

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