Effect of Derivative Instruments on Income and Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	$ 74		$ 54		$ 331
Derivatives in Fair Value Hedging Relationship
Derivative Instruments, Gain (Loss) [Line Items]
Total	(8)	[1]	(14)	[1]	(6)	[1]
Derivatives in Fair Value Hedging Relationship | Interest and other income, net
Derivative Instruments, Gain (Loss) [Line Items]
Foreign exchange contracts	(31)	[1]	(2)	[1]	(35)	[1]
Hedged item	23	[1]	(12)	[1]	29	[1]
Derivatives not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in Income on Derivatives	(73)		10		(40)
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	(67)		29		(40)
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	(6)		(19)		0
Cash Flow Hedging Relationship | Foreign Exchange Contract
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	73		54		331
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)	(447)	[2]	(323)	[2]	(320)	[2]
Cash Flow Hedging Relationship | Foreign Exchange Contract | Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Gains Reclassified from AOCI into Income (Effective Portion)	217		43		203
Cash Flow Hedging Relationship | Interest rate contract
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives Before Tax Effect (Effective Portion)	$ 1		$ 0		$ 0

[1] Losses related to the amount excluded from effectiveness testing of the hedges were $6 million, $14 million, and $8 million for the years ended December 31, 2010, December 31, 2011, and December 31, 2012.

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