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Business Segments - Other Costs by Segment (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting Information [Line Items]    
Total other costs $ 19 $ 65
Operating Segments [Member] | Rig Technology [Member]
   
Segment Reporting Information [Line Items]    
Total other costs 1 7
Operating Segments [Member] | Petroleum Services & Supplies [Member]
   
Segment Reporting Information [Line Items]    
Total other costs 5 56
Operating Segments [Member] | Distribution & Transmission [Member]
   
Segment Reporting Information [Line Items]    
Total other costs $ 13 $ 2