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Stock-based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Aggregate intrinsic value of stock options outstanding 459us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Aggregate intrinsic value of stock options exercisable 306us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue      
Total intrinsic value of options exercised 314us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 176us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 142us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements 514us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Expected to be recognized in 2015 238slb_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsExpectedToBeRecognizedInYearOne      
Expected to be recognized in 2016 152slb_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsExpectedToBeRecognizedInYearTwo      
Expected to be recognized in 2017 73slb_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsExpectedToBeRecognizedInYearThree      
Expected to be recognized in 2018 43slb_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsExpectedToBeRecognizedInYearFour      
Expected to be recognized in 2019 8slb_EmployeeServiceShareBasedCompensationUnrecognizedCompensationCostsOnNonvestedAwardsExpectedToBeRecognizedInYearFive      
Future Grants Shares 33,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant      
Employee Stock Option        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock option maximum term 10 years      
Stock options vesting period Four or Five Years      
Weighted average remaining contractual life of stock options exercisable, in years 4 years 2 months 12 days      
Performance Shares        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance period to determine shares earned 3 years      
Performance shares outstanding 600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
     
Performance Shares | Scenario Return On Capital Employed Exceeds Predefined Target | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be granted as a percentage of total target award 250.00%slb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPercentageOfSharesGranted
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementScenarioAxis
= slb_ScenarioReturnOnCapitalEmployedExceedsPredefinedTargetMember
     
Performance Shares | Scenario Return On Capital Employed Falls Below Threshold        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_StatementScenarioAxis
= slb_ScenarioReturnOnCapitalEmployedFallsBelowThresholdMember
     
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Performance shares to be granted 1,341,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,949,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
1,668,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Performance shares outstanding 4,138,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
4,171,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
3,566,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
2,433,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted stock awards, vesting period   3 years    
DSPP        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage purchase price of stock lower of stock price at beginning or end of plan period at specified intervals 92.50%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= slb_DiscountedStockPurchasePlanMember