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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Rigs
Reporting_Unit
Sep. 30, 2015
USD ($)
Rigs
Mar. 31, 2015
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Rigs
shares
Dec. 31, 2014
USD ($)
Rigs
shares
Dec. 31, 2013
USD ($)
shares
Indefinite-lived Intangible Assets [Line Items]              
Maturity period of investments description         Three months or less    
Minimum derivative financial instrument's term (months)         2 months    
Maximum derivative financial instrument's term (months)         24 months    
Allowances for excess and obsolete inventories $ 500,000,000       $ 500,000,000 $ 370,000,000  
Depreciation expense related to property, plant and equipment         391,000,000 413,000,000 $ 381,000,000
Impairment of long-lived assets         0 0 0
Goodwill 6,980,000,000       6,980,000,000 8,539,000,000 9,049,000,000
Indefinite-lived intangible assets 3,849,000,000       $ 3,849,000,000 $ 4,444,000,000  
Estimated useful lives of intangible assets, minimum         2 years    
Estimated useful lives of intangible assets, maximum         30 years    
Amortization expense $ 340,000,000       $ 340,000,000    
Number of years as first period of amortization         5 years    
Worldwide average rig count | Rigs 2,034 2,188     2,034 3,632  
Change in number of rigs owned from prior quarters 7.00% 44.00%          
Impairment of goodwill         $ 1,485,000,000    
Impairment charges on identified intangible assets   $ 55,000,000          
Net foreign currency transaction gains (losses)         (47,000,000) $ 20,000,000 $ (24,000,000)
Net investment in Venezuela $ 25,000,000       25,000,000    
Devaluation charges 7,000,000   $ 9,000,000 $ 12,000,000      
Net allowances for doubtful accounts 159,000,000       $ 159,000,000 $ 125,000,000  
Anti-dilutive stock options outstanding | shares         13 8 7
Wellbore Technologies [Member]              
Indefinite-lived Intangible Assets [Line Items]              
Goodwill $ 2,874,000,000       $ 2,874,000,000 $ 4,357,000,000 $ 4,425,000,000
Number of reporting units has impairment loss | Reporting_Unit 2            
Impairment of goodwill $ 1,485,000,000       1,485,000,000    
Indefinite-lived Trade Names [Member]              
Indefinite-lived Intangible Assets [Line Items]              
Indefinite-lived intangible assets $ 384,000,000       384,000,000    
Other Intangible Assets [Member] | Wellbore Technologies [Member]              
Indefinite-lived Intangible Assets [Line Items]              
Intangible asset impairment         $ 149,000,000