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Summary of Significant Accounting Policies - Identified Intangible Assets Identified by Segment (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance $ 4,743 $ 4,073
Additions to intangible assets 696 981
Amortization (363) (305)
Currency translation adjustments and other (21) (6)
Ending Balance 5,055 4,743
Rig Technology [Member]
    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 1,112 654
Additions to intangible assets 101 545
Amortization (90) (76)
Currency translation adjustments and other 2 (11)
Ending Balance 1,125 1,112
Petroleum Services & Supplies [Member]
    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 3,550 3,391
Additions to intangible assets 421 380
Amortization (259) (224)
Currency translation adjustments and other (24) 3
Ending Balance 3,688 3,550
Distribution & Transmission [Member]
    
Intangible Asset Excluding Goodwill [Line Items]    
Beginning Balance 81 28
Additions to intangible assets 174 56
Amortization (14) (5)
Currency translation adjustments and other 1 2
Ending Balance $ 242 $ 81