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Summary of Goodwill Activity (Detail) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Goodwill [Line Items]  
Beginning Balance $ 1,349
New acquisitions 553
Other adjustments 7 [1]
Ending Balance 1,909
North America
 
Goodwill [Line Items]  
Beginning Balance 1,116
New acquisitions 388
Other adjustments 3 [1]
Ending Balance 1,507
International
 
Goodwill [Line Items]  
Beginning Balance 233
New acquisitions 165
Other adjustments 4 [1]
Ending Balance $ 402
[1] Primarily includes changes in foreign exchange.