Changes in the Components of Other Comprehensive Income (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Net income	$ 2,729		$ 2,167		$ 7,033		$ 5,962
Change in unrealized gains on marketable securities, net of taxes	(81)	[1]	214	[1]	5	[1]	421	[1]
Change in cumulative translation adjustment	(328)		139		129		(29)
Change in unrealized gains on cash flow hedges, net of taxes	38	[2]	(168)	[2]	(40)	[2]	34	[2]
Comprehensive income	$ 2,358		$ 2,352		$ 7,127		$ 6,388

[1] Change in unrealized gains on marketable securities is recorded net of taxes of $92 million and $35 million for the three months ended September 30, 2010 and 2011, and $124 million and $33 million for the nine months ended September 30, 2010 and 2011.

[2] Change in unrealized gains on cash flow hedges is recorded net of taxes of $115 million and $23 million for the three months ended September 30, 2010 and 2011, and $24 million and $32 million for the nine months ended September 30, 2010 and 2011.