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Acquisitions and Investments - Preliminary 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  
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
Cost in excess of billings     71
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
Billings in excess of cost     41
Other liabilities 206 56 111
Total liabilities 792 136 294
Cash consideration, net of cash acquired $ 2,880 $ 334 $ 556