Effect of Derivative Instruments on Income and Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash Flow Hedging Relationship | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Increase (Decrease) in Gains Recognized in AOCI on Derivative Before Tax Effect (Effective Portion)	$ 54		$ 331		$ (14)
Cash Flow Hedging Relationship | Foreign Exchange Contract | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains Reclassified from AOCI into Income (Effective Portion)	43		203		325
Cash Flow Hedging Relationship | Foreign Exchange Contract | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	(323)	[1]	(320)	[1]	(268)	[1]
Derivatives in Fair Value Hedging Relationship
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	(14)	[2]	(6)	[2]	0	[2]
Derivatives in Fair Value Hedging Relationship | Foreign Exchange Contract | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	(2)	[2]	(35)	[2]	2	[2]
Derivatives in Fair Value Hedging Relationship | Hedged item | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	(12)	[2]	29	[2]	(2)	[2]
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	10		(40)		(78)
Derivatives not designated as hedging instruments | Foreign Exchange Contract | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	29		(40)		(78)
Derivatives not designated as hedging instruments | Interest rate contract | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	$ (19)		$ 0		$ 0

[1] Gains (losses) related to the ineffective portion of the hedges were not material in all periods presented.

[2] Losses related to the amount excluded from effectiveness testing of the hedges were $0, $6 million, and $14 million for the years ended December 31, 2009, December 31, 2010, and December 31, 2011.