Long-term Debt and Debt Facility Agreements - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Investment in subsidiary-Schlumberger Investment SA	100.00%
Committed debt facility agreement aggregated	$ 3,900,000,000
Unused debt facility	2,300,000,000
Long-term debt - current portion	1,244,000,000us-gaap_LongTermDebtCurrent	1,819,000,000us-gaap_LongTermDebtCurrent
Weighted average interest rate on variable rate debt	1.30%
Long-term Debt maturity in 2016	1,600,000,000
Long-term Debt maturity in 2017	1,000,000,000
Long-term Debt maturity in 2018	1,900,000,000
Long-term Debt maturity in 2019	900,000,000
Long-term Debt maturity in 2021	2,700,000,000
Long-term Debt maturity in 2022	1,000,000,000
Long-term Debt maturity in 2023	1,500,000,000
Long-term debt, fair value	10,700,000,000us-gaap_DebtInstrumentFairValue	10,400,000,000us-gaap_DebtInstrumentFairValue
Commercial Paper
Debt Instrument [Line Items]
Committed debt facility agreement aggregated	3,500,000,000
Long-term debt - current portion		95,000,000
Long-term debt	1,500,000,000
Commercial paper programs mature in July 2016
Debt Instrument [Line Items]
Committed debt facility agreement aggregated	250,000,000
Commercial paper programs mature in July 2018
Debt Instrument [Line Items]
Committed debt facility agreement aggregated	1,750,000,000
Commercial paper programs mature in November 2018
Debt Instrument [Line Items]
Committed debt facility agreement aggregated	$ 1,500,000,000

Long term debt maturities repayments of principal in year eight.

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Long term debt maturities repayments of principal in year nine.

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Long term debt maturities repayments of principal in year seven.

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- Definition

Weighted average interest rate on variable rate debt.

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Section 03

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-Subparagraph (SX 210.7-03.16)

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 3

-Subparagraph (SX 210.12-04.(a))

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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