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Acquisitions and Investments - Estimated Fair Values of Assets Acquired and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Business Acquisition [Line Items]      
Current assets, net of cash acquired   $ 351  
Property, plant and equipment   443  
Intangible assets   273  
Goodwill 1,000 377 298
Other assets   73  
Total assets acquired 3,672 1,517 850
Current liabilities   234  
Long-term debt   16  
Other liabilities   229  
Total liabilities 792 479 294
Cash consideration, net of cash acquired   1,038  
All Other Acquisitions [Member]
      
Business Acquisition [Line Items]      
Current assets, net of cash acquired 1,441 106 136
Property, plant and equipment 248 41 38
Intangible assets 981 131 299
Goodwill 1,000 178 298
Other assets 2 14 8
Total assets acquired 3,672 470 850
Current liabilities 585 80 142
Long-term debt 1    
Other liabilities 206 56 111
Total liabilities 792 136 294
Cash consideration, net of cash acquired $ 2,880 $ 334 $ 556