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Business Segments - Other Cost by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Total other costs $ 57 $ 28 $ 122 $ 32
Operating Segments [Member] | Rig Technology [Member]
       
Segment Reporting Information [Line Items]        
Total other costs 13 17 20 21
Operating Segments [Member] | Petroleum Services & Supplies [Member]
       
Segment Reporting Information [Line Items]        
Total other costs 31 3 87 3
Operating Segments [Member] | Distribution & Transmission [Member]
       
Segment Reporting Information [Line Items]        
Total other costs $ 13 $ 8 $ 15 $ 8