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Business Segments - Other Cost by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Segment Reporting Information [Line Items]        
Total other costs $ 9 $ 48 $ 131 $ 80
Operating Segments [Member] | Rig Technology [Member]
       
Segment Reporting Information [Line Items]        
Total other costs 2 12 22 33
Operating Segments [Member] | Petroleum Services & Supplies [Member]
       
Segment Reporting Information [Line Items]        
Total other costs 3   90 3
Operating Segments [Member] | Distribution & Transmission [Member]
       
Segment Reporting Information [Line Items]        
Total other costs $ 4 $ 36 $ 19 $ 44