Revenues By Geographic Area (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 5,574,431,000	$ 4,980,201,000	$ 4,845,338,000	$ 4,607,618,000	$ 4,888,666,000	$ 4,212,271,000	$ 4,023,497,000	$ 3,890,692,000	$ 20,007,588,000	$ 17,015,126,000	$ 14,025,910,000
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									10,549,594,000	9,152,363,000	7,384,308,000
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5,667,610,000	4,942,104,000	4,290,274,000
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,639,397,000	1,965,154,000	1,603,107,000
Latin America, Mexico And Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 1,150,987,000	$ 955,505,000	$ 748,221,000