Schlumberger Limited (SLB) 10-K29 Jan 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	SLB
Entity Registrant Name	SCHLUMBERGER LTD /NV/
Entity Central Index Key	87347
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	1,275,312,404
Entity Public Float		$152.90

CONSOLIDATED_STATEMENT_OF_INCO

CONSOLIDATED STATEMENT OF INCOME (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Revenue	$48,580		$45,266		$41,731
Interest and other income	291		165		172
Gain on formation of OneSubsea			1,028
Expenses
Cost of revenue	37,398		35,331		32,885
Research & engineering	1,217		1,174		1,153
General & administrative	475		416		405
Merger & integration					128
Impairments & other	1,773		456		33
Interest	369		391		340
Income from continuing operations before taxes	7,639		8,691		6,959
Taxes on income	1,928		1,848		1,700
Income from continuing operations	5,711		6,843		5,259
Income (loss) from discontinued operations	-205		-69		260
Net income	5,506		6,774		5,519
Net income attributable to noncontrolling interests	68		42		29
Net income attributable to Schlumberger	5,438		6,732		5,490
Schlumberger amounts attributable to:
Income from continuing operations	5,643		6,801		5,230
Income (loss) from discontinued operations	-205		-69		260
Net income attributable to Schlumberger	$5,438		$6,732		$5,490
Basic earnings per share of Schlumberger:
Income from continuing operations	$4.36		$5.14		$3.93
Income (loss) from discontinued operations	($0.16)		($0.05)		$0.20
Net income	$4.20		$5.09		$4.13
Diluted earnings per share of Schlumberger:
Income from continuing operations	$4.31		$5.10		$3.91
Income (loss) from discontinued operations	($0.16)		($0.05)		$0.19
Net income	$4.16	[1]	$5.05	[1]	$4.10	[1]
Average shares outstanding:
Basic	1,295		1,323		1,330
Assuming dilution	1,308		1,333		1,339

[1]	Amounts may not add due to rounding.

CONSOLIDATED_STATEMENT_OF_COMP

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$5,506	$6,774	$5,519
Currency translation adjustments
Unrealized net change arising during the period	-463	-151	76
Marketable securities
Unrealized gain (loss) arising during the period	-166	35	141
Cash flow hedges
Net gain (loss) on cash flow hedges	-238	49	92
Reclassification to net income of net realized (gain) loss	113	-50	-36
Actuarial gain (loss)
Actuarial gain (loss) arising during the period	-1,285	1,328	-1,016
Amortization to net income of net actuarial loss	177	300	187
Prior service cost
Amortization to net income of net prior service cost	128	125	125
Income taxes on pension and other postretirement benefit plans	82	-302	100
Comprehensive income	3,854	8,108	5,188
Comprehensive income attributable to noncontrolling interests	68	42	29
Comprehensive income attributable to Schlumberger	$3,786	$8,066	$5,159

CONSOLIDATED_BALANCE_SHEET

CONSOLIDATED BALANCE SHEET (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets
Cash	$3,130	$3,472
Short-term investments	4,371	4,898
Receivables less allowance for doubtful accounts (2014 - $275; 2013 - $384)	11,171	11,497
Inventories	4,628	4,603
Deferred taxes	144	288
Other current assets	1,250	1,467
Current assets total	24,694	26,225
Fixed Income Investments, held to maturity	442	363
Investments in Affiliated Companies	3,235	3,317
Fixed Assets less accumulated depreciation	15,396	15,096
Multiclient Seismic Data	793	667
Goodwill	15,487	14,706
Intangible Assets	4,654	4,709
Other Assets	2,203	2,017
Total Assets	66,904	67,100
Current Liabilities
Accounts payable and accrued liabilities	9,246	8,837
Estimated liability for taxes on income	1,647	1,490
Long-term debt - current portion	1,244	1,819
Short-term borrowings	1,521	964
Dividends payable	518	415
Current Liabilities Total	14,176	13,525
Long-term Debt	10,565	10,393
Postretirement Benefits	1,501	670
Deferred Taxes	1,296	1,708
Other Liabilities	1,317	1,169
Total Liabilities	28,855	27,465
Equity
Common stock	12,495	12,192
Treasury stock	-11,772	-8,135
Retained earnings	41,333	37,966
Accumulated other comprehensive loss	-4,206	-2,554
Schlumberger stockholdersâ€™ equity	37,850	39,469
Noncontrolling interests	199	166
Total equity	38,049	39,635
Liabilities and stockholders equity	$66,904	$67,100

CONSOLIDATED_BALANCE_SHEET_Par

CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts on receivable	$275	$384	$202	$177

CONSOLIDATED_STATEMENT_OF_CASH

CONSOLIDATED STATEMENT OF CASH FLOWS (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Cash flows from operating activities:
Net Income	$5,506		$6,774		$5,519
Add: Loss (income) from discontinued operations	205		69		-260
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on formation of OneSubsea			-1,028
Impairments and other charges	1,773		608
Depreciation and amortization	4,094	[1]	3,879	[1]	3,647	[1]
Pension and other postretirement benefits expense	355		518		403
Stock-based compensation expense	329		315		335
Pension and other postretirement benefits funding	-390		-538		-673
Earnings of equity method investments, less dividends received	-113		-71		-61
Change in operating assets and liabilities:
Increase in receivables	-187	[2]	-803	[2]	-2,051	[2]
(Increase) decrease in inventories	-36	[2]	188	[2]	-645	[2]
Decrease (increase) in other current assets	119	[2]	17	[2]	-350	[2]
Increase in other assets	-134	[2]	-78	[2]	-28	[2]
(Decrease) increase in accounts payable and accrued liabilities	-36	[2]	654	[2]	876	[2]
Increase in estimated liability for taxes on income	104	[2]	34	[2]	125	[2]
(Decrease) increase in other liabilities	-79	[2]	60	[2]	1	[2]
Other	-315	[2]	92	[2]	77	[2]
NET CASH PROVIDED BY OPERATING ACTIVITIES	11,195		10,690		6,915
Cash flows from investing activities:
Capital expenditures	-3,976		-3,943		-4,694
SPM investments	-740		-902		-372
Multiclient seismic data capitalized	-321		-394		-351
Business acquisitions and investments, net of cash acquired	-1,008		-1,210		-845
Sale (purchase) of investments, net	446		-648		-1,228
Other	19		218		-55
NET CASH USED IN INVESTING ACTIVITIES	-5,580		-6,879		-7,545
Cash flows from financing activities:
Dividends paid	-1,968		-1,608		-1,432
Proceeds from employee stock purchase plan	295		270		247
Proceeds from exercise of stock options	530		267		163
Stock repurchase program	-4,678		-2,596		-972
Proceeds from issuance of long-term debt	2,289		4,554		2,832
Repayment of long-term debt	-2,878		-3,141		-1,817
Net increase in short-term borrowings	552		37		621
Other	-38		18		19
NET CASH USED IN FINANCING ACTIVITIES	-5,896		-2,199		-339
Cash flow provided by (used in) discontinued operations - operating activities	24		-2		145
Cash flow (used in) provided by discontinued operations - investing activities			-28		1,011
Cash flow provided by (used in) discontinued operations	24		-30		1,156
Net (decrease) increase in cash before translation effect	-257		1,582		187
Translation effect on cash	-85		-15		13
Cash, beginning of year	3,472		1,905		1,705
Cash, end of year	$3,130		$3,472		$1,905

[1]	Includes depreciation of property, plant and equipment and amortization of intangible assets, multiclient seismic data costs and SPM investments.
[2]	Net of the effect of business acquisitions and divestitures.

CONSOLIDATED_STATEMENT_OF_EQUI

CONSOLIDATED STATEMENT OF EQUITY (USD $)	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
In Millions, except Share data	Total	Common Stock Issued	Common Stock In Treasury	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Balance at Dec. 31, 2011	$31,392	$11,639	($5,679)	$28,860	($3,557)	$129
Balance, shares at Dec. 31, 2011	1,334,000,000	1,434,000,000	-100,000,000
Net income	5,519			5,490		29
Net income	5,519
Currency translation adjustments excluding amount from sale of CE Franklin	71				71
Change in unrealized gain on marketable securities	141				141
Changes in fair value of cash flow hedges	56				56
Pension and other postretirement benefit plans	-604				-604
Shares sold to optionees less shares exchanged	163	-75	238
Shares sold to optionees, less shares exchanged, shares	4,000,000		4,000,000
Vesting of restricted stock		-20	20
Shares issued under employee stock purchase plan	247	16	231
Shares issued under employee stock purchase plan, shares	4,000,000		4,000,000
Stock repurchase program	-972		-972
Stock repurchase program, shares	-14,000,000		-14,000,000
Stock-based compensation cost	335	335
Sale of CE Franklin	-63				5	-68
Dividends declared	-1,463			-1,463
Other	36	17	2			17
Currency translation adjustments	76
Change in unrealized gain on marketable securities	141				141
Shares sold to optionees, less shares exchanged, shares	4,171,000
Balance at Dec. 31, 2012	34,858	11,912	-6,160	32,887	-3,888	107
Balance, shares at Dec. 31, 2012	1,328,000,000	1,434,000,000	-106,000,000
Net income	6,774			6,732		42
Change in unrealized gain on marketable securities	35				35
Changes in fair value of cash flow hedges	-1				-1
Pension and other postretirement benefit plans	1,451				1,451
Shares sold to optionees less shares exchanged	267	-44	311
Shares sold to optionees, less shares exchanged, shares	5,000,000		5,000,000
Vesting of restricted stock		-56	56
Vesting of restricted stock, shares	1,000,000		1,000,000
Shares issued under employee stock purchase plan	270	18	252
Shares issued under employee stock purchase plan, shares	4,000,000		4,000,000
Stock repurchase program	-2,596		-2,596
Stock repurchase program, shares	-31,000,000		-31,000,000
Stock-based compensation cost	315	315
Dividends declared	-1,653			-1,653
Other	66	47	2			17
Currency translation adjustments	-151				-151
Change in unrealized gain on marketable securities	35				35
Shares sold to optionees, less shares exchanged, shares	5,168,000
Balance at Dec. 31, 2013	39,635	12,192	-8,135	37,966	-2,554	166
Balance, shares at Dec. 31, 2013	1,307,000,000	1,434,000,000	-127,000,000
Net income	5,506			5,438		68
Change in unrealized gain on marketable securities	-166				-166
Changes in fair value of cash flow hedges	-125				-125
Pension and other postretirement benefit plans	-898				-898
Shares sold to optionees less shares exchanged	530	-26	556
Shares sold to optionees, less shares exchanged, shares	9,000,000		9,000,000
Vesting of restricted stock		-79	79
Vesting of restricted stock, shares	1,000,000		1,000,000
Shares issued under employee stock purchase plan	295	33	262
Shares issued under employee stock purchase plan, shares	4,000,000		4,000,000
Stock repurchase program	-4,678		-4,678
Stock repurchase program, shares	-48,000,000		-48,000,000
Stock-based compensation cost	329	329
Dividends declared	-2,071			-2,071
Shares issued for acquisition	213	72	141
Other	-58	-26	3			-35
Currency translation adjustments	-463				-463
Change in unrealized gain on marketable securities	-166				-166
Shares sold to optionees, less shares exchanged, shares	8,269,000
Shares issued for acquisition, shares	2,000,000		2,000,000
Balance at Dec. 31, 2014	$38,049	$12,495	($11,772)	$41,333	($4,206)	$199
Balance, shares at Dec. 31, 2014	1,275,000,000	1,434,000,000	-159,000,000

CONSOLIDATED_STATEMENT_OF_EQUI1

CONSOLIDATED STATEMENT OF EQUITY (Parenthetical) (Retained Earnings, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retained Earnings
Dividends declared, per share	$1.60	$1.25	$1.10

Business_Description

Business Description	12 Months Ended
Business Description	Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business Description	1. Business Description
Business Description	Schlumberger Limited (Schlumberger N.V., incorporated in Curaçao) and its consolidated subsidiaries (collectively, “Schlumberger”) comprise the world’s leading supplier of technology, integrated project management and information solutions to the international oil and gas exploration and production industry.

Summary_of_Accounting_Policies

Summary of Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Accounting Policies

2. Summary of Accounting Policies

The Consolidated Financial Statements of Schlumberger have been prepared in accordance with accounting principles generally accepted in the United States of America.

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Schlumberger, its wholly-owned subsidiaries, and other subsidiaries over which it exercises a controlling financial interest. All significant intercompany transactions and balances have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. On an ongoing basis, Schlumberger evaluates its estimates, including those related to collectibility of accounts receivable; recoverability of fixed assets, goodwill, intangible assets, Schlumberger Production Management investments and investments in affiliates; income taxes; multiclient seismic data; contingencies and actuarial assumptions for employee benefit plans. Schlumberger bases its estimates on historical experience and other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.

Revenue Recognition

Schlumberger recognizes revenue based upon purchase orders, contracts or other persuasive evidence of an arrangement with the customer that include fixed or determinable prices provided that collectibility is reasonably assured. Revenue is recognized for services when they are rendered. Revenue is recognized for products upon delivery and when the customer assumes the risks and rewards of ownership.

Revenue from seismic contract services performed on a dayrate basis is recognized as the service is performed. Revenue from other services, including pre-funded multiclient surveys, is recognized as the seismic data is acquired and/or processed on a proportionate basis as work is performed. This method requires revenue to be recognized based upon quantifiable measures of progress, such as square kilometers acquired. Multiclient data surveys are licensed or sold to customers on a non-transferable basis. Revenue from sales of completed multiclient data surveys is recognized upon obtaining a signed licensing agreement and providing customers with access to such data.

Revenue is occasionally generated from contractual arrangements that include multiple deliverables. Revenue from these arrangements is recognized as each item is delivered based on their relative fair value, provided that the delivered items have stand-alone value to the customer.

Revenue derived from the sale of licenses of Schlumberger software may include installation, maintenance, consulting and training services. If services are not essential to the functionality of the software, the revenue for each element of the contract is recognized separately based on its respective vendor specific objective evidence of fair value when all of the following conditions are met: a signed contract is obtained, delivery has occurred, the fee is fixed or determinable and collectibility is probable.

Translation of Non-United States Currencies

The functional currency of Schlumberger is primarily the US dollar. Assets and liabilities recorded in functional currencies other than US dollars are translated at period-end exchange rates. The resulting adjustments are charged or credited directly to the Equity section of the Consolidated Balance Sheet. Revenue and expenses are translated at the weighted-average exchange rates for the period. Realized and unrealized transaction gains and losses are included in income in the period in which they occur. Transaction losses of $67 million, $24 million and $37 million, net of hedging activities, were recognized in 2014, 2013 and 2012, respectively.

Short-term and Fixed Income Investments

The Consolidated Balance Sheet reflects the Schlumberger investment portfolio separated between current and long term, based on maturity. Both Short-term investments and Fixed Income Investments, held to maturity are comprised primarily of money market funds, time deposits, certificates of deposit, commercial paper, bonds and notes, substantially all of which are denominated in US dollars. Under normal circumstances Schlumberger intends to hold such investments until maturity, with the exception of $194 million of investments at December 31, 2013 that are considered trading. Short-term investments designated as trading are stated at fair value, which is estimated using quoted market prices for those or similar investments. All other investments are stated at cost plus accrued interest, which approximates market. The unrealized gains/losses on investments designated as trading were not significant at December 31, 2013.

For purposes of the Consolidated Statement of Cash Flows, Schlumberger does not consider Short-term investments to be cash equivalents.

Fixed Income Investments, held to maturity at December 31, 2014 of $442 million mature as follows: $49 million in 2016, $91 million in 2017, $298 million in 2018, $3 million in 2019 and $1 million in 2020.

Inventories

Inventories are stated at average cost or at market, whichever is lower. Costs included in Inventories consist of materials, direct labor and manufacturing overhead.

Investments in Affiliated Companies

Investments in companies in which Schlumberger does not have a controlling financial interest, but over which it has significant influence are accounted for using the equity method. Schlumberger’s share of the after-tax earnings of equity method investees is included in Interest and other income. Investments in privately held companies in which Schlumberger does not have the ability to exercise significant influence are accounted for using the cost method. Investments in publicly traded companies in which Schlumberger does not have significant influence are accounted for as available-for-sale marketable securities. These marketable securities are reported at fair value, based on quoted market prices, with unrealized gains and losses reported as a component of Accumulated other comprehensive loss. The fair value of these marketable securities was $91 million and $257 million at December 31, 2014 and 2013, respectively. The cost basis of these marketable securities was $81 million at both December 31, 2014 and 2013.

Equity and cost method investments as well as investments in publicly traded companies are classified as Investments in Affiliated Companies in the Consolidated Balance Sheet.

Fixed Assets and Depreciation

Fixed assets are stated at cost less accumulated depreciation, which is provided for by charges to income over the estimated useful lives of the assets using the straight-line method. Fixed assets include the manufacturing cost of oilfield technical equipment manufactured or assembled by subsidiaries of Schlumberger. Expenditures for replacements and improvements are capitalized. Maintenance and repairs are charged to operating expenses as incurred. Upon sale or other disposition, the applicable amounts of asset cost and accumulated depreciation are removed from the balance sheet and the net amount, less proceeds from disposal, is charged or credited to income.

Multiclient Seismic Data

The multiclient library consists of completed and in-process seismic surveys that are licensed on a nonexclusive basis. Schlumberger capitalizes costs directly incurred in acquiring and processing the multiclient seismic data. Such costs are charged to Cost of revenue based on the percentage of the total costs to the estimated total revenue that Schlumberger expects to receive from the sales of such data. However, under no circumstance will an individual survey carry a net book value greater than a 4-year, straight-line amortized value.

The carrying value of the multiclient library is reviewed for impairment annually as well as when an event or change in circumstance indicating impairment may have occurred. Adjustments to the carrying value are recorded when it is determined that estimated future cash flows, which involves significant judgment on the part of Schlumberger, would not be sufficient to recover the carrying value of the surveys. Significant adverse changes in Schlumberger’s estimated future cash flows could result in impairment charges in a future period.

Schlumberger Production Management

Schlumberger Production Management (SPM) projects are focused on developing and co-managing the production of Schlumberger customers’ assets under long-term agreements. Schlumberger will invest its own services, products and in some cases cash, into the field development activities and operations. Although in certain arrangements Schlumberger is paid for a portion of the services or products it provides, generally Schlumberger will not be paid at the time of providing its services or upon delivery of its products. Instead, Schlumberger is compensated based upon cash flow generated or on a fee-per-barrel basis for any incremental production Schlumberger helps deliver above a mutually agreed baseline.

Schlumberger capitalizes its cash investments in a project as well as the direct costs associated with providing services or products for which Schlumberger will be compensated if incremental production is achieved. Revenue is recognized as the incremental production is achieved. These capitalized investments are amortized to the Consolidated Statement of Income as incremental oil production is achieved based on the units of production method, whereby each incremental unit produced is assigned a pro-rata portion of the unamortized costs based on estimated total incremental production, resulting in a matching of revenue with the applicable costs.

The unamortized portion of Schlumberger’s investments in SPM projects was approximately $1.411 billion and $1.154 billion at December 31, 2014 and 2013, respectively. These amounts are included within Other Assets in Schlumberger’s Consolidated Balance Sheet. In 2014, Schlumberger revised its Consolidated Statement of Cash Flows to present certain cash outflows relating to SPM activities as a separate line item within investing activities, referred to as SPM investments. Schlumberger historically presented such cash outflows as an operating activity. This change was not material to prior periods.

Goodwill, Intangible Assets and Long-lived Assets

Schlumberger records the excess of purchase price over the fair value of the tangible and identifiable intangible assets acquired and liabilities assumed as goodwill. The goodwill relating to each of Schlumberger’s reporting units is tested for impairment annually as well as when an event, or change in circumstances, indicates an impairment may have occurred.

Under generally accepted accounting principles, Schlumberger has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of one of its reporting units is greater than its carrying amount. If, after assessing the totality of events or circumstances, Schlumberger determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, then there is no need to perform any further testing. However, if Schlumberger concludes otherwise, then it is required to perform the first step of a two-step impairment test by calculating the fair value of the reporting unit and comparing the fair value with the carrying amount of the reporting unit. If the fair value of the reporting unit is less than its carrying value, an impairment loss is recorded to the extent that the implied fair value of the goodwill of the reporting unit is less than its carrying value.

Schlumberger has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.

For purposes of performing the impairment test for goodwill, Schlumberger’s reporting units are its three Groups: Reservoir Characterization, Drilling and Production. Schlumberger elected to perform the qualitative assessment described above for purposes of its annual goodwill impairment test in 2014. Based on this assessment, Schlumberger concluded that it was more likely than not that the fair value of each of its reporting units was greater than its carrying amount. Accordingly, no further testing was required.

Long-lived assets, including fixed assets, intangible assets and investments in SPM projects, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. In reviewing for impairment, the carrying value of such assets is compared to the estimated undiscounted future cash flows expected from the use of the assets and their eventual disposition. If such cash flows are not sufficient to support the asset’s recorded value, an impairment charge is recognized to reduce the carrying value of the long-lived asset to its estimated fair value. The determination of future cash flows as well as the estimated fair value of long-lived assets involve significant estimates on the part of management. If there is a material change in economic conditions or other circumstances influencing the estimate of future cash flows or fair value, Schlumberger could be required to recognize impairment charges in the future.

Intangible assets consist primarily of customer relationships, technology/technical know-how and tradenames acquired in business combinations. Customer relationships are generally amortized over periods ranging from 15 to 28 years, acquired technology/technical know-how are generally amortized over periods ranging from 10 to 18 years, and tradenames are generally amortized over periods ranging from 15 to 30 years.

Taxes on Income

Schlumberger computes taxes on income in accordance with the tax rules and regulations of the many taxing authorities where the income is earned. The income tax rates imposed by these taxing authorities vary substantially. Taxable income may differ from pretax income for financial accounting purposes. To the extent that differences are due to revenue or expense items reported in one period for tax purposes and in another period for financial accounting purposes, an appropriate provision for deferred income taxes is made. Any effect of changes in income tax rates or tax laws are included in the provision for income taxes in the period of enactment. When it is more likely than not that a portion or all of the deferred tax asset will not be realized in the future, Schlumberger provides a corresponding valuation allowance against deferred tax assets.

Schlumberger’s tax filings are subject to regular audit by the tax authorities in most of the jurisdictions in which it conducts business. These audits may result in assessments for additional taxes which are resolved with the authorities or, potentially, through the courts. Schlumberger recognizes the impact of a tax position in its financial statements if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Tax liabilities are recorded based on estimates of additional taxes which will be due upon the conclusion of these audits. Estimates of these tax liabilities are made based upon prior experience and are updated in light of changes in facts and circumstances. However, due to the uncertain and complex application of tax regulations, the ultimate resolution of audits may result in liabilities which could be materially different from these estimates. In such an event, Schlumberger will record additional tax expense or tax benefit in the year in which such resolution occurs.

Schlumberger generally does not provide income taxes relating to undistributed earnings, as the earnings either would not be taxable when remitted or are considered to be indefinitely reinvested.

Concentration of Credit Risk

Schlumberger’s assets that are exposed to concentrations of credit risk consist primarily of cash, short-term investments, fixed income investments held to maturity, receivables from clients and derivative financial instruments. Schlumberger places its cash, short-term investments and fixed income investments held to maturity with financial institutions and corporations, and limits the amount of credit exposure with any one of them. Schlumberger regularly evaluates the creditworthiness of the issuers in which it invests. Accounts receivable are spread over many countries and customers. Schlumberger maintains an allowance for uncollectible accounts receivable based on expected collectibility and performs ongoing credit evaluations of its customers’ financial condition. By using derivative financial instruments to hedge certain exposures, Schlumberger exposes itself to some credit risk. Schlumberger minimizes this credit risk by entering into transactions with high-quality counterparties, limiting the exposure to each counterparty and monitoring the financial condition of its counterparties.

Research & Engineering

All research and engineering expenditures are expensed as incurred.

Earnings per Share

Basic earnings per share of Schlumberger from continuing operations is calculated by dividing income from continuing operations attributable to Schlumberger by the weighted average number of common shares outstanding during the year. Diluted earnings per share is calculated by dividing income from continuing operations attributable to Schlumberger by the sum of (i) unvested restricted stock units and (ii) the weighted average number of common shares outstanding assuming dilution. The weighted average number of common shares outstanding assuming dilution assumes that all in-the-money stock options are exercised at the beginning of the period and the related proceeds are used by Schlumberger to purchase shares of its common stock at the average market price for the period.

The following is a reconciliation from basic to diluted earnings per share from continuing operations of Schlumberger for each of the last three years:

(Stated in millions except per share amounts)

Schlumberger

Weighted

Earnings

Income from

Average

Per Share

Continuing

from

Operations

Outstanding

Continuing

Operations

2014:00:00

Basic

5,643

1,295

4.36

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

5,643

1,308

4.31

2013:00:00

Basic

6,801

1,323

5.14

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

6,801

1,333

5.1

2012:00:00

Basic

5,230

1,330

3.93

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

5,230

1,339

3.91

Employee stock options to purchase 5 million, 12 million and 21 million shares of common stock at December 31, 2014, 2013 and 2012, respectively, were outstanding but not included in the computation of diluted earnings per share because the option exercise price was greater than the average market price of the common stock, and therefore the effect on diluted earnings per share would have been anti-dilutive.

Recently Issued Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2014-09, Revenue from Contracts with Customers. This ASU amends the existing accounting standards for revenue recognition and is based on the principle that revenue should be recognized to depict the transfer of goods or services to a customer at an amount that reflects the consideration a company expects to receive in exchange for those goods or services. Schlumberger is required to adopt this ASU on January 1, 2017 and does not expect this ASU to have a material impact on its consolidated financial statements.

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements and Property, Plant, and Equipment – Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which amends the definition of a discontinued operation by raising the threshold for a disposal to qualify as a discontinued operation. The threshold under the ASU is defined as a strategic shift that has, or will have, a major effect on an entity’s operations and financial results such as a disposal of a major geographical area or a major line of business. Schlumberger adopted this ASU, on a prospective basis, effective January 1, 2015.

Charges_and_Credits

Charges and Credits	12 Months Ended
Charges and Credits	Dec. 31, 2014
Restructuring And Related Activities [Abstract]
Charges and Credits	3. Charges and Credits
	Schlumberger recorded the following charges and credits in continuing operations during 2014, 2013 and 2012:
	2014
	·	Due to the expectation of lower exploration spending as a result of lower commodity prices, during the fourth quarter of 2014, Schlumberger decided to restructure its WesternGeco marine seismic fleet in order to lower its operating costs. Three previous-generation acquisition vessels with lower towing capacity and higher operating costs will be converted to source vessels, allowing for the termination of two third-party source vessel leases and the retirement of two owned source vessels.
	As a result of this restructuring, Schlumberger performed an impairment test and determined that the carrying values of certain of its vessels exceeded their respective fair values by $590 million. This impairment charge relates to the six Explorer-class vessels which were acquired at a premium in the 2007 purchase of Eastern Echo Holdings Plc. The fair value of these vessels was estimated primarily based on the replacement cost method, which was largely based on unobservable inputs that required significant judgments.
	In addition to the $590 million impairment charge relating to these six vessels, Schlumberger also recorded an $85 million impairment charge relating to a seismic intangible asset and $131 million of other charges primarily related to lease termination costs and other seismic assets as a result of the restructuring. Schlumberger did not incur any significant cash expenditures as a result of these charges.
	·	During 2014, Venezuela enacted certain changes to its foreign exchange system such that, in addition to the official rate of 6.3 Venezuelan Bolivares fuertes per US dollar, there are currently two other legal exchange rates that may be obtained via different exchange rate mechanisms. These changes included the expansion of what is known as the SICAD I auction rate and the introduction of the SICAD II auction process. The SICAD I and SICAD II exchange rates were approximately 11 and 50 Venezuelan Bolivares fuertes to the US dollar, respectively, at December 31, 2014.
	Although the functional currency of Schlumberger’s operations in Venezuela is the US dollar, a portion of the transactions are denominated in local currency. Schlumberger has historically applied the official exchange rate to remeasure local currency transactions and balances into US dollars.
	Effective December 31, 2014, Schlumberger concluded that it was appropriate to apply the SICAD II exchange rate as it now believes that this rate best represents the economics of Schlumberger’s business activity in Venezuela. As a result, Schlumberger recorded a $472 million devaluation charge during the fourth quarter of 2014.
	Going forward, this change will result in a reduction in the US dollar reported amount of local currency denominated revenues, expenses and, consequently, income before taxes and net income. For example, if Schlumberger had applied an exchange rate of 50 Venezuelan Bolivares fuertes to the US dollar throughout 2014, it would have reduced Schlumberger earnings by approximately $0.08 per share.
	·	In response to lower commodity pricing and anticipated lower exploration and production spending in 2015, Schlumberger decided during the fourth quarter of 2014 to reduce its overall headcount primarily to better align with anticipated activity levels for 2015. As a result of these reductions, Schlumberger recorded a charge of $296 million in the fourth quarter of 2014. Depending on how the market situation evolves, further actions may be necessary, which could result in additional charges in future periods.
	·	During the fourth quarter of 2014, Schlumberger determined that, primarily as a result of the recent decline in commodity prices, the carrying value of its investment in an SPM development project in the Eagle Ford Shale was in excess of its fair value. Accordingly, Schlumberger recorded a $199 million impairment charge. The fair value of this investment was estimated based on the projected present value of future cash flows, which included unobservable inputs that required significant judgments.

	The following is a summary of these charges:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	WesternGeco restructuring	$	806		$	25	$	781		Impairments & other
	Currency devaluation loss in Venezuela		472			—		472		Impairments & other
	Workforce reduction		296			37		259		Impairments & other
	Impairment of SPM project		199			72		127		Impairments & other
		$	1,773		$	134	$	1,639
	2013
	·	During the fourth quarter, Schlumberger recorded a $152 million provision relating to accounts receivable from a client in Brazil that filed for bankruptcy.
	●	During the second quarter, Schlumberger recorded a $1.028 billion gain as a result of the deconsolidation of its subsea business in connection with the formation of the OneSubsea joint venture with Cameron International Corporation (“Cameron”). Refer to Note 4 – Acquisitions for further details.
	●	During the second quarter, Schlumberger recorded a $222 million impairment charge relating to an investment in a company involved in developing drilling-related technology and a $142 million impairment charge relating to an investment in a contract drilling business.
	●	In February 2013, Venezuela’s currency was devalued from the prior exchange rate of 4.3 Bolivar Fuertes per US dollar to 6.3 Bolivar fuertes per US dollar. As a result, Schlumberger recorded a $92 million devaluation charge during the first quarter of 2013.
	The following is a summary of these charges and credits:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	Gain on formation of OneSubsea joint venture	$	(1,028	)	$	—	$	(1,028	)	Gain on formation of OneSubsea
	Impairment of equity-method investments		364			19		345		Impairments & other
	Provision for accounts receivable		152			30		122		Cost of revenue
	Currency devaluation loss in Venezuela		92			—		92		Impairments & other
		$	(420	)	$	49	$	(469	)
	2012
	●	Schlumberger recorded merger and integration-related charges throughout 2012 of $128 million in connection with its 2010 acquisitions of Smith International, Inc. and Geoservices.
	●	During the fourth quarter, Schlumberger recorded a charge of $33 million relating to severance in connection with an initiative to rationalize global overhead costs.
	The following is a summary of these charges:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	Merger and integration-related costs	$	128		$	16	$	112		Merger & integration
	Workforce reduction		33			6		27		Impairments & other
		$	161		$	22	$	139

Acquisitions

Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2014
Business Combinations [Abstract]
Acquisitions	4. Acquisitions
	Formation of OneSubsea Joint Venture
	On June 30, 2013, Schlumberger and Cameron completed the formation of OneSubsea, a joint venture to manufacture and develop products, systems and services for the subsea oil and gas market. Schlumberger and Cameron each contributed all of their respective subsea businesses to the joint venture and Schlumberger made a $600 million cash payment to Cameron. Schlumberger owns 40% of OneSubsea and accounts for this investment under the equity method. Schlumberger recognized a pretax and after-tax gain of $1.028 billion, which is classified as Gain on formation of OneSubsea in the Consolidated Statement of Income, as a result of the deconsolidation of its subsea business. This gain is equal to the difference between the fair value of the Schlumberger subsea business, which was determined based on the present value of its estimated future cash flows, and its carrying value at the time of closing.
	Other
	Schlumberger made other acquisitions and investments for cash payments, net of cash acquired, of $1.008 billion during 2014, $610 million during 2013, and $845 million during 2012. Additionally, during 2014, Schlumberger issued 2.1 million shares of its common stock, valued at $213 million, in connection with an acquisition. None of these transactions were significant to Schlumberger’s consolidated financial statements, individually or in the aggregate.
	On January 20, 2015, Schlumberger announced that it has entered into an agreement to acquire a minority ownership of approximately 45% in Eurasia Drilling Company Limited, the largest provider of onshore drilling services in Russia. The total cost of this transaction, including an option which will allow Schlumberger, at its election, to purchase the remaining shares during a two-year period commencing on the third anniversary of the closing of the transaction, is approximately $1.7 billion in cash. This transaction is expected to close during the first quarter of 2015.

Inventories

Inventories	12 Months Ended
Inventories	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventories	5. Inventories
	A summary of inventories follows:
		(Stated in millions)

		2014		2013
	Raw materials & field materials	$	2,666	$	2,539
	Work in process		273		261
	Finished goods		1,689		1,803
		$	4,628	$	4,603

Fixed_Assets

Fixed Assets	12 Months Ended
Fixed Assets	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Fixed Assets	6. Fixed Assets
	A summary of fixed assets follows:
		(Stated in millions)

		2014		2013
	Land	$	445	$	394
	Buildings & improvements		3,733		3,534
	Machinery & equipment		31,937		29,332
	Seismic vessels		849		1,904
			36,964		35,164
	Less accumulated depreciation		21,568		20,068
		$	15,396	$	15,096
	The estimated useful lives of Buildings & improvements are primarily 25 to 30 years. The estimated useful lives of Machinery & equipment are primarily 5 to 10 years. Seismic vessels are depreciated over periods ranging from 20 to 30 years.
	Depreciation expense relating to fixed assets was $3.2 billion, $3.1 billion and $2.9 billion in 2014, 2013 and 2012, respectively.

Multiclient_Seismic_Data

Multiclient Seismic Data	12 Months Ended
Multiclient Seismic Data	Dec. 31, 2014
Multiclient Seismic Data [Abstract]
Multiclient Seismic Data	7. Multiclient Seismic Data
	The change in the carrying amount of multiclient seismic data is as follows:
		(Stated in millions)

		2014			2013
	Balance at beginning of year	$	667		$	518
	Capitalized in year		321			394
	Charged to expense		(195	)		(245	)
		$	793		$	667

Goodwill

Goodwill	12 Months Ended
Goodwill	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	8. Goodwill
	The changes in the carrying amount of goodwill by reporting unit were as follows:
											(Stated in millions)
		Reservoir			Drilling			Production			Total
		Characterization			Drilling			Production			Total
	Balance at January 1, 2013	$	3,760		$	8,337		$	2,488			$	14,585
	Acquisitions		4			3			336				343
	Divestiture of business		—			—			(150	)			(150	)
	Other		(27	)		(25	)		(20	)			(72	)
	Balance, December 31, 2013		3,737			8,315			2,654				14,706
	Acquisitions		15			271			551				837
	Reallocation		83			(83	)		—				—
	Other		(23	)		(15	)		(18	)			(56	)
	Balance, December 31, 2014	$	3,812		$	8,488		$	3,187			$	15,487

Intangible_Assets

Intangible Assets	12 Months Ended
Intangible Assets	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	9. Intangible Assets
	A summary of intangible assets follows:
		(Stated in millions)

		2014						2013
		Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
		Book Value		Amortization		Value		Book Value		Amortization		Value
	Technology/Technical Know-How	$	1,747	$	535	$	1,212	$	1,960	$	597	$	1,363
	Tradenames		1,641		319		1,322		1,647		257		1,390
	Customer Relationships		2,531		523		2,008		2,263		407		1,856
	Other		380		268		112		435		335		100
		$	6,299	$	1,645	$	4,654	$	6,305	$	1,596	$	4,709
	Amortization expense was $344 million in 2014, $330 million in 2013 and $331 million in 2012.
	Based on the carrying value of intangible assets at December 31, 2014, amortization expense for the subsequent five years is estimated to be as follows: 2015: $349 million, 2016: $338 million, 2017: $329 million, 2018: $319 million and 2019: $307 million.

Longterm_Debt_and_Debt_Facilit

Long-term Debt and Debt Facility Agreements	12 Months Ended
Long-term Debt and Debt Facility Agreements	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt and Debt Facility Agreements	10. Long-term Debt and Debt Facility Agreements
	Long-term Debt consists of the following:
		(Stated in millions)

		2014		2013
	3.30% Senior Notes due 2021	$	1,597	$	1,596
	3.65% Senior Notes due 2023		1,495		1,495
	2.75% Guaranteed Notes due 2015 (1)		—		1,373
	1.95% Senior Notes due 2016		1,100		1,099
	4.20% Senior Notes due 2021		1,100		1,099
	1.25% Senior Notes due 2017		1,000		999
	2.40% Senior Notes due 2022		999		999
	1.50% Guaranteed Notes due 2019(1)		628		697
	2.65% Senior Notes due 2016 (2)		500		500
	Commercial paper borrowings		1,538		—
	Other		608		536
		$	10,565	$	10,393
	(1)	Schlumberger maintains a €5.0 billion Guaranteed Euro Medium Term Note program that provides for the issuance of various types of debt instruments such as fixed or floating rate notes in euro, US dollar or other currencies. The following is a summary of outstanding debt that was issued under this program:
	·	Schlumberger issued €0.5 billion 1.50% Guaranteed Notes due 2019 in the fourth quarter of 2013. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate equal to three-month LIBOR plus approximately 64 basis points.
	·	Schlumberger issued €1.0 billion 2.75% Guaranteed Notes due 2015 in the fourth quarter of 2010. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate of 2.56%.
	(2)	Schlumberger entered into agreements to swap these dollar notes for euros on the date of issue until maturity, effectively making this a euro-denominated debt on which Schlumberger pays interest in euros at a rate of 2.39%.
	Schlumberger Limited fully and unconditionally guarantees the securities issued by certain of its subsidiaries, including securities issued by Schlumberger Investment SA, a wholly-owned finance subsidiary of Schlumberger.
	At December 31, 2014, Schlumberger had separate committed debt facility agreements aggregating $3.9 billion with commercial banks, of which $2.3 billion was available and unused. This included $3.5 billion of committed facilities which supports commercial paper programs, of which $250 million mature in July 2016, $1.75 billion mature in July 2018 and $1.5 billion mature in November 2018. Interest rates and other terms of borrowing under these lines of credit vary from country to country.
	Commercial paper borrowings are classified as long-term debt to the extent of their backup by available and unused committed credit facilities maturing in more than one year and to the extent it is Schlumberger’s intent to maintain these obligations for longer than one year. Borrowings under the commercial paper program at December 31, 2014 were $1.5 billion, all of which were classified within Long-term debt in the Consolidated Balance Sheet. At December 31, 2013, borrowings under the commercial paper program were $95 million, all of which were classified within Long-term debt – current portion in the Consolidated Balance Sheet.
	The weighted average interest rate on variable rate debt as of December 31, 2014 was 1.3%.
	Long-term Debt as of December 31, 2014, is due as follows: $1.6 billion in 2016, $1.0 billion in 2017, $1.9 billion in 2018, $0.9 billion in 2019, $2.7 billion in 2021, $1.0 billion in 2022 and $1.5 billion in 2023.
	The fair value of Schlumberger’s Long-term Debt at December 31, 2014 and December 31, 2013 was $10.7 billion and $10.4 billion, respectively, and was estimated based on quoted market prices.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	12 Months Ended
Derivative Instruments and Hedging Activities	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	11. Derivative Instruments and Hedging Activities
	Schlumberger is exposed to market risks related to fluctuations in interest rates and foreign currency exchange rates. To mitigate these risks, Schlumberger utilizes derivative instruments. Schlumberger does not enter into derivative transactions for speculative purposes.
	Interest Rate Risk
	Schlumberger is subject to interest rate risk on its debt and its investment portfolio. Schlumberger maintains an interest rate risk management strategy that uses a mix of variable and fixed rate debt combined with its investment portfolio and occasionally interest rate swaps to mitigate the exposure to changes in interest rates.
	During the fourth quarter of 2013, Schlumberger entered into a cross currency swap for a notional amount of €0.5 billion in order to hedge changes in the fair value of Schlumberger’s €0.5 billion 1.50% Guaranteed Notes due 2019. Under the terms of this swap, Schlumberger will receive interest at a fixed rate of 1.50% on the euro notional amount and pay interest at a floating rate of three-month LIBOR plus approximately 64 basis points on the US dollar notional amount.
	This cross currency swap is designated as a fair value hedge of the underlying debt. This derivative instrument is marked to market with gains and losses recognized currently in income to largely offset the respective gains and losses recognized on changes in the fair value of the hedged debt.
	At December 31, 2014, Schlumberger had fixed rate debt aggregating $9.0 billion and variable rate debt aggregating $4.3 billion, after taking into account the effect of the swap.
	Short-term investments and Fixed income investments, held to maturity, totaled $4.8 billion at December 31, 2014. The carrying value of these investments approximated fair value, which was estimated using quoted market prices for those or similar investments.
	Foreign Currency Exchange Rate Risk
	As a multinational company, Schlumberger conducts its business in approximately 85 countries. Schlumberger’s functional currency is primarily the US dollar. Approximately 81% of Schlumberger’s revenues in 2014 was denominated in US dollars. However, outside the United States, a significant portion of Schlumberger’s expenses is incurred in foreign currencies. Therefore, when the US dollar weakens (strengthens) in relation to the foreign currencies of the countries in which Schlumberger conducts business, the US dollar–reported expenses will increase (decrease).
	Schlumberger is exposed to risks on future cash flows to the extent that the local currency is not the functional currency and expenses denominated in local currency are not equal to revenues denominated in local currency. Schlumberger is also exposed to risks on future cash flows relating to certain of its fixed rate debt which is denominated in currencies other than the functional currency. Schlumberger uses foreign currency forward contracts and foreign currency options to provide a hedge against a portion of these cash flow risks. These contracts are accounted for as cash flow hedges, with the effective portion of changes in the fair value of the hedge recorded on the Consolidated Balance Sheet and in Accumulated Other Comprehensive Loss. Amounts recorded in Accumulated Other Comprehensive Loss are reclassified into earnings in the same period or periods that the hedged item is recognized in earnings. The ineffective portion of changes in the fair value of hedging instruments, if any, is recorded directly to earnings.
	At December 31, 2014, Schlumberger recognized a cumulative net $96 million loss in Accumulated other comprehensive loss relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges, the majority of which is expected to be reclassified into earnings within the next 12 months.
	Schlumberger is exposed to changes in the fair value of assets and liabilities which are denominated in currencies other than the functional currency. While Schlumberger uses foreign currency forward contracts and foreign currency options to economically hedge this exposure as it relates to certain currencies, these contracts are not designated as hedges for accounting purposes. Instead the fair value of the contracts are recorded on the Consolidated Balance Sheet and changes in the fair value are recognized in the Consolidated Statement of Income as are changes in fair value of the hedged item.
	At December 31, 2014, contracts were outstanding for the US dollar equivalent of $6.8 billion in various foreign currencies, of which $2.5 billion relate to hedges of debt denominated in currencies other than the functional currency.

	The fair values of outstanding derivative instruments are summarized as follows:

		(Stated in millions)

		Fair Value of Derivatives						Consolidated Balance Sheet Classification
	Derivative Assets
	Derivative Assets	2014			2013
	Derivatives designated as hedges:
	Foreign exchange contracts	$	3		$	98		Other current assets
	Foreign exchange contracts		32			24		Other Assets
	Cross currency swap		—			27		Other Assets
			35			149
	Derivatives not designated as hedges:
	Foreign exchange contracts		5			10		Other current assets
	Foreign exchange contracts		—			4		Other Assets
			5			14
		$	40		$	163
	Derivative Liabilities
	Derivatives designated as hedges:
	Foreign exchange contracts	$	80		$	14		Accounts payable and accrued liabilities
	Foreign exchange contracts		105			1		Other Liabilities
	Cross currency swap		42			—		Other Liabilities
			227			15
	Derivatives not designated as hedges:
	Foreign exchange contracts		28			2		Accounts payable and accrued liabilities

		$	255		$	17
	The fair value of all outstanding derivatives is determined using a model with inputs that are observable in the market or can be derived from or corroborated by observable data.
	The effect of derivative instruments designated as fair value hedges and those not designated as hedges on the Consolidated Statement of Income was as follows:
		(Stated in millions)

		Gain (Loss) Recognized in Income								Consolidated Statement of
		2014			2013			2012		Income Classification
	Derivatives designated as fair value hedges:
	Cross currency swap	$	(82	)	$	15		$	1	Interest expense

	Derivatives not designated as hedges:
	Foreign exchange contracts	$	(95	)	$	(2	)	$	5	Cost of revenue
	Commodity contracts		—			—			1	Cost of revenue
		$	(95	)	$	(2	)	$	6

Stockholders_Equity

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2014
Equity [Abstract]
Stockholders' Equity	12. Stockholders’ Equity
	Schlumberger is authorized to issue 4,500,000,000 shares of common stock, par value $0.01 per share, of which 1,275,312,404 and 1,307,330,369 shares were outstanding on December 31, 2014 and 2013, respectively. Holders of common stock are entitled to one vote for each share of stock held. Schlumberger is also authorized to issue 200,000,000 shares of preferred stock, par value $0.01 per share, which may be issued in series with terms and conditions determined by the Board of Directors. No shares of preferred stock have been issued.
	Accumulated Other Comprehensive Loss consists of the following:
		(Stated in millions)

		Currency			Cash Flow			Pension and			Unrealized			Total
		Translation			Hedges			Other			Gains on Marketable
		Adjustments						Postretirement			Securities
								Benefit Plans
	Balance, January 1, 2012	$	(993	)	$	(26	)	$	(2,538	)	$	—		$	(3,557	)
	Other comprehensive income (loss) before reclassifications		76			92			(1,016	)		141			(707	)
	Amounts reclassified from accumulated other comprehensive loss		—			(36	)		312			—			276
	Income taxes		—			—			100			—			100
	Balance, December 31, 2012		(917	)		30			(3,142	)		141			(3,888	)
	Other comprehensive income (loss) before reclassifications		(151	)		49			1,328			35			1,261
	Amounts reclassified from accumulated other comprehensive loss		—			(50	)		425			—			375
	Income taxes		—			—			(302	)		—			(302	)
	Balance, December 31, 2013		(1,068	)		29			(1,691	)		176			(2,554	)
	Other comprehensive income (loss) before reclassifications		(463	)		(238	)		(1,285	)		(166	)		(2,152	)
	Amounts reclassified from accumulated other comprehensive loss		—			113			305			—			418
	Income taxes		—			—			82			—			82
	Balance, December 31, 2014	$	(1,531	)	$	(96	)	$	(2,589	)	$	10		$	(4,206	)


	Other comprehensive loss was $1.652 billion in 2014 and $331 million in 2012. Other comprehensive income was $1.334 billion in 2013.

Stockbased_Compensation_Plans

Stock-based Compensation Plans	12 Months Ended
Stock-based Compensation Plans	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based Compensation Plans	13. Stock-based Compensation Plans
	Schlumberger has three types of stock-based compensation programs: (i) stock options, (ii) a restricted stock, restricted stock unit and performance share unit program (collectively referred to as “restricted stock”) and (iii) a discounted stock purchase plan (“DSPP”).
	Stock Options
	Key employees are granted stock options under Schlumberger stock option plans. For all of the stock options granted, the exercise price equals the average of the high and low sales prices of Schlumberger stock on the date of grant; an option’s maximum term is ten years, and options generally vest in increments over five years.
	The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions and resulting weighted-average fair value per share:

		2014				2013				2012
	Dividend yield		1.6	%			1.7	%			1.5	%
	Expected volatility		37	%			38	%			39	%
	Risk free interest rate		2.2	%			1.2	%			1.5	%
	Expected option life in years		7				7				6.9
	Weighted-average fair value per share	$	34.2			$	23.93			$	25.26
	The following table summarizes information concerning options outstanding and options exercisable as of December 31, 2014:

			(Shares stated in thousands)

			Options Outstanding											Options Exercisable
	Exercise prices range		Options				Weighted-				Weighted-			Options			Weighted-
			Outstanding				average				average			Exercisable			average
							remaining				exercise						exercise
							contractual life				price						price
							(in years)
	$32.45 - $67.87			6,553				3.2			$	51.5			6,295		$	51.03
	$68.51 - $70.93			8,346				6.9			$	69.82			3,648		$	69.02
	$72.11 - $78.31			7,553				7.2			$	72.56			1,915		$	72.47
	$83.88 - $84.93			8,045				5.2			$	84.17			5,118		$	84.34
	$88.61 - $114.83			8,086				8.1			$	97.78			1,566		$	95.92
				38,583				6.2			$	76.1			18,542		$	69.77
	The weighted average remaining contractual life of stock options exercisable as of December 31, 2014 was 4.2 years.
	The following table summarizes stock option activity during the years ended December 31, 2014, 2013 and 2012:

		(Shares stated in thousands)

		2014								2013						2012
		Shares				Weighted-				Shares			Weighted-			Shares			Weighted-
						average							average						average
						exercise							exercise						exercise
						price							price						price
	Outstanding at beginning of year		41,939			$	70.33				42,059		$	67.77			40,027		$	63.84
	Granted		6,105			$	99.04				6,570		$	72.16			8,664		$	72.04
	Exercised		(8,269	)		$	64.19				(5,168	)	$	51.73			(4,171	)	$	39.07
	Forfeited		(1,192	)		$	73.56				(1,522	)	$	70.57			(2,461	)	$	67.5
	Outstanding at year-end		38,583			$	76.1				41,939		$	70.33			42,059		$	67.77
	The aggregate intrinsic value of stock options outstanding as of December 31, 2014 was $459 million.
	The aggregate intrinsic value of stock options exercisable as of December 31, 2014 was $306 million.
	The total intrinsic value of options exercised during the years ended December 31, 2014, 2013 and 2012 was $314 million, $176 million and $142 million, respectively.
	Restricted Stock
	During 2013, Schlumberger began granting performance share units to certain executives. The number of shares earned is determined at the end of each performance period, which is generally three years, based on Schlumberger’s achievement of a predefined return on capital employed (“ROCE”), as defined in the underlying performance share unit agreement. In the event the ROCE exceeds the predefined target, shares for up to the maximum of 250% of the target award may be granted. In the event the ROCE falls below the predefined target, a reduced number of shares may be granted. If the ROCE falls below the threshold award performance level, no shares will be granted. As of December 31, 2014, performance share units of 0.6 million were outstanding based on the achievement of 100% of target.
	All other restricted stock awards generally vest at the end of three years.
	Restricted stock awards do not pay dividends or allow voting rights during the performance period. Accordingly, the fair value of the restricted stock award is the quoted market price of Schlumberger’s stock on the date of grant less the present value of the expected dividends not received during the vesting period.
	The following table summarizes information about all restricted stock transactions:

		(Shares stated in thousands)

		2014								2013						2012
		Restricted				Weighted				Restricted			Weighted			Restricted			Weighted
		Stock				Average				Stock			Average			Stock			Average
						Grant Date							Grant Date						Grant Date
						Fair Value							Fair Value						Fair Value
	Unvested at beginning of year		4,171			$	76.01				3,566		$	73.62			2,433		$	72.25
	Granted		1,341				96.08				1,949			75.65			1,668			71.09
	Vested		(1,186	)			81.59				(958	)		66.98			(351	)		52.26
	Forfeited		(188	)			78.68				(386	)		74.53			(184	)		73.38
	Unvested at end of year		4,138			$	80.8				4,171		$	76.01			3,566		$	73.62
Discounted Stock Purchase Plan
Under the terms of the DSPP, employees can choose to have a portion of their earnings withheld, subject to certain restrictions, to purchase Schlumberger common stock. The purchase price of the stock is 92.5% of the lower of the stock price at the beginning or end of the plan period at six-month intervals.
The fair value of the employees’ purchase rights under the DSPP was estimated using the Black-Scholes model with the following assumptions and resulting weighted average fair value per share:

	2014				2013				2012
Dividend yield		1.6	%			1.7	%			1.6	%
Expected volatility		19	%			24	%			41	%
Risk free interest rate		0.1	%			0.1	%			0.2	%
Weighted average fair value per share	$	12.67			$	9.91			$	12.71
Total Stock-based Compensation Expense
The following summarizes stock-based compensation expense recognized in income:

	(Stated in millions)

	2014				2013				2012
Stock options	$	177			$	165			$	203
Restricted stock		114				110				82
DSPP		38				40				50
	$	329			$	315			$	335
At December 31, 2014, there was $514 million of total unrecognized compensation cost related to nonvested stock-based compensation arrangements, of which $238 million is expected to be recognized in 2015, $152 million in 2016, $73 million in 2017, $43 million in 2018 and $8 million in 2019.
As of December 31, 2014, approximately 33 million shares of Schlumberger common stock were available for future grants under Schlumberger’s stock-based compensation programs.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	14. Income Taxes
	Schlumberger operates in more than 100 tax jurisdictions, where statutory tax rates generally vary from 0% to 40%.
	Income from continuing operations before taxes which were subject to United States and non-United States income taxes for each of the three years ended December 31, were as follows:
		(Stated in millions)

		2014			2013			2012
	United States	$	1,990		$	1,904		$	1,980
	Outside United States		5,649			6,787			4,979
		$	7,639		$	8,691		$	6,959
	Schlumberger recorded pretax charges of $1.773 billion in 2014 ($289 million in the US and $1.484 billion outside of the US). Schlumberger recorded net pretax credits of $420 million in 2013 ($53 million of charges in the US and $473 million of net credits outside the US) and $161 million of pretax charges in 2012 ($52 million in the US and $109 million outside the US). These charges and credits are included in the table above and are more fully described in Note 3 – Charges and Credits.
	The components of net deferred tax assets (liabilities) were as follows:
		(Stated in millions)

		2014			2013
	Postretirement benefits	$	327		$	236
	Intangible assets		(1,435	)		(1,502	)
	Investments in non-US subsidiaries		(227	)		(282	)
	Other, net		183			128
		$	(1,152	)	$	(1,420	)
	The above deferred tax balances at December 31, 2014 and 2013 were net of valuation allowances relating to net operating losses in certain countries of $190 million and $238 million, respectively.
	The components of Taxes on income were as follows:
		(Stated in millions)

		2014			2013			2012
	Current:
	United States - Federal	$	718		$	682		$	698
	United States - State		51			60			53
	Outside United States		1,380			1,211			1,025
		$	2,149		$	1,953		$	1,776
	Deferred:
	United States - Federal	$	(194	)	$	(109	)	$	(105	)
	United States - State		(9	)		(4	)		(7	)
	Outside United States		(12	)		34			22
	Valuation allowance		(6	)		(26	)		14
		$	(221	)	$	(105	)	$	(76	)
		$	1,928		$	1,848		$	1,700
	A reconciliation of the United States statutory federal tax rate (35%) to the consolidated effective tax rate is:

		2014			2013			2012
	US statutory federal rate		35	%		35	%		35	%
	Non-US income taxed at different rates		(11	)		(12	)		(10	)
	Charges and credits (See Note 3)		3			(2	)		—
	Other		(2	)		—			(1	)
			25	%		21	%		24	%
	A number of the jurisdictions in which Schlumberger operates have tax laws that are not fully defined and are evolving. Schlumberger’s tax filings are subject to regular audit by the tax authorities. Tax liabilities are recorded based on estimates of additional taxes which will be due upon the conclusion of these audits.
	A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax positions for the years ended December 31, 2014, 2013 and 2012 is as follows:
		(Stated in millions)

		2014			2013			2012
	Balance at beginning of year	$	1,452		$	1,453		$	1,353
	Additions based on tax positions related to the current year		154			146			156
	Additions for tax positions of prior years		96			109			98
	Additions related to acquisitions		43			—			—
	Impact of changes in exchange rates		(62	)		(47	)		12
	Settlements with tax authorities		(27	)		(64	)		(17	)
	Reductions for tax positions of prior years		(212	)		(109	)		(103	)
	Reductions due to the lapse of the applicable statute of limitations		(42	)		(36	)		(46	)
	Balance at end of year	$	1,402		$	1,452		$	1,453
	The amounts above exclude accrued interest and penalties of $243 million, $253 million and $250 million at December 31, 2014, 2013 and 2012, respectively.
	Schlumberger classifies interest and penalties relating to uncertain tax positions within Taxes on income in the Consolidated Statement of Income. During 2014, 2013 and 2012, Schlumberger recognized $19 million, $30 million and $21 million in interest and penalties, respectively.
	The following table summarizes the tax years that are either currently under audit or remain open and subject to examination by the tax authorities in the most significant jurisdictions in which Schlumberger operates:

	Brazil		2009 - 2014
	Canada		2007 - 2014
Ecuador		2001 - 2014
Mexico		2007 - 2014
Norway		2013 - 2014
Russia		2011 - 2014
Saudi Arabia		2001 - 2014
United Kingdom		2009 - 2014
United States		2011 - 2014
In certain of the jurisdictions noted above, Schlumberger operates through more than one legal entity, each of which may have different open years subject to examination. The table above presents the open years subject to examination for the most material of the legal entities in each jurisdiction. Additionally, it is important to note that tax years are technically not closed until the statute of limitations in each jurisdiction expires. In the jurisdictions noted above, the statute of limitations can extend beyond the open years subject to examination.

Leases_and_Lease_Commitments

Leases and Lease Commitments	12 Months Ended
Leases and Lease Commitments	Dec. 31, 2014
Leases [Abstract]
Leases and Lease Commitments	15. Leases and Lease Commitments
	Total rental expense was $2.1 billion in 2014, $1.9 billion in 2013, and $1.9 billion in 2012.
	Future minimum rental commitments under noncancelable operating leases for each of the next five years are as follows:

	(Stated in millions)

	2015	$	330
	2016		259
	2017		197
	2018		156
	2019		134
	Thereafter		554
		$	1,630

Contingencies

Contingencies	12 Months Ended
Contingencies	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Contingencies Disclosure [Text Block]	16. Contingencies
	In 2009, United States officials began a grand jury investigation and an associated regulatory inquiry, both related to certain historical Schlumberger operations in countrieswhere Schlumberger no longer operates that are subject to United States trade and economic sanctions. Governmental agencies and authorities have a broad range of civil and criminal penalties that they may seek to impose for violations of trade and economic sanction laws including, but not limited to, disgorgement, fines, penalties and modifications to business practices. In recent years, these agencies and authorities have obtained a wide range of penalties in settlements with companies arising from trade and economic sanction investigations, including in some cases forfeitures, fines and other penalties in the tens and hundreds of millions of dollars. Schlumberger continues to cooperate and has been discussing the resolution of this matter with the governmental authorities. During the second quarter of 2014, these discussions progressed to a point whereby Schlumberger determined that it was appropriate to increase its liability for this contingency. Accordingly, Schlumberger recorded a $205 million charge, which is reflected within Loss from discontinued operations in the Consolidated Statement of Income. However, no certainty exists that a settlement will be reached or if so, the amount of any such settlement. Therefore, the ultimate loss could be greater or less than the amount accrued.
	Schlumberger and its subsidiaries are party to various other legal proceedings from time to time. A liability is accrued when a loss is both probable and can be reasonably estimated. Management believes that the probability of a material loss with respect to these other legal proceedings is remote. However, litigation is inherently uncertain and it is not possible to predict the ultimate disposition of any of these proceedings.

Segment_Information

Segment Information	12 Months Ended
Segment Information	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	17. Segment Information
	Schlumberger’s segments are as follows:
	●	Reservoir Characterization Group – Consists of the principal technologies involved in finding and defining hydrocarbon resources. These include WesternGeco, Wireline, Testing Services, Schlumberger Information Services and PetroTechnical Services.
	●	Drilling Group – Consists of the principal technologies involved in the drilling and positioning of oil and gas wells. These include Bits & Advanced Technologies, M-I SWACO, Geoservices, Drilling & Measurements, Drilling Tools & Remedial Services, Saxon Rig Services and Integrated Project Management well construction projects.
	●	Production Group – Consists of the principal technologies involved in the lifetime production of oil and gas reservoirs. These include Well Services, Completions, Artificial Lift, Well Intervention, Water Services, and the Schlumberger Production Management field production projects.
	Financial information for the years ended December 31, 2014, 2013 and 2012, by segment, is as follows:

		(Stated in millions)

		2014
		Revenue				Income				Assets		Depreciation		Capital
						before						and		Expenditures
						taxes						Amortization
	Reservoir Characterization	$	12,224			$	3,607			$	8,596	$	1,391	$	1,152
	Drilling		18,462				3,872				11,378		1,174		1,328
	Production		18,111				3,227				11,848		1,133		1,246
	Eliminations & other		(217	)			(130	)			1,577		198		250
	Pretax operating income						10,576
	Goodwill and intangible assets										20,142
	All other assets										2,185
	Corporate (1)						(848	)			11,178		198
	Interest income (2)						31
	Interest expense (3)						(347	)
	Charges & credits (4)						(1,773	)
		$	48,580			$	7,639			$	66,904	$	4,094	$	3,976

		(Stated in millions)

		2013
		Revenue				Income				Assets		Depreciation		Capital
						before						and		Expenditures
						taxes						Amortization
	Reservoir Characterization	$	12,463			$	3,660			$	8,918	$	1,338	$	1,275
	Drilling		17,099				3,293				10,940		1,077		1,291
	Production		15,927				2,619				11,185		1,039		1,204
	Eliminations & other		(223	)			(228	)			1,974		217		173
	Pretax operating income						9,344
	Goodwill and intangible assets										19,415
	All other assets										2,618
	Corporate (1)						(726	)			12,050		208
	Interest income (2)						22
	Interest expense (3)						(369	)
	Charges & credits (4)						420
		$	45,266			$	8,691			$	67,100	$	3,879	$	3,943

		(Stated in millions)
		2012
		Revenue				Income				Assets		Depreciation and		Capital
						before						Amortization		Expenditures
						taxes
	Reservoir Characterization	$	11,360			$	3,080			$	8,501	$	1,309	$	1,235
	Drilling		15,691				2,778				11,316		1,072		1,668
	Production		14,802				2,327				9,889		877		1,439
	Eliminations & other		(122	)			(68	)			1,920		191		352
	Pretax operating income						8,117
	Goodwill and intangible assets										19,387
	Discontinued operations assets										246
	All other assets										2,267
	Corporate (1)						(696	)			8,021		198
	Interest income (2)						30
	Interest expense (3)						(331	)
	Charges & credits (4)						(161	)
		$	41,731			$	6,959			$	61,547	$	3,647	$	4,694
	(1)	Comprised principally of certain corporate expenses not allocated to the segments, interest on postretirement medical benefits, stock-based compensation costs, amortization expense associated with certain intangible and other nonoperating items. Corporate assets consist of cash, short-term investments, fixed income investments, held to maturity and investments in affiliates.
(2)	Interest income excludes amounts which are included in the segments’ income (2014: $20 million; 2013: $11 million; 2012: $- million).
(3)	Interest expense excludes amounts which are included in the segments’ income (2014: $22 million; 2013: $22 million; 2012: $9 million).
(4)	See Note 3 – Charges and Credits.
Segment assets consist of receivables, inventories, fixed assets, multiclient seismic data and SPM investments.
Depreciation and amortization includes depreciation of property, plant and equipment and amortization of intangible assets, multiclient seismic data costs and SPM investments.
Revenue by geographic area for the years ended December 31, 2014, 2013 and 2012 is as follows:

	(Stated in millions)

	2014				2013				2012
North America	$	16,151			$	13,897			$	13,535
Latin America		7,699				7,754				7,554
Europe/CIS/Africa		12,515				12,411				11,510
Middle East & Asia		11,875				10,767				8,717
Eliminations & other		340				437				415
	$	48,580			$	45,266			$	41,731
Revenue is based on the location where services are provided.
During each of the three years ended December 31, 2014, 2013 and 2012, no single customer exceeded 10% of consolidated revenue.
Schlumberger did not have revenue from third-party customers in its country of domicile during the last three years. Revenue in the United States in 2014, 2013 and 2012 was $14.0 billion, $12.0 billion and $11.8 billion, respectively.
Fixed Assets less accumulated depreciation by geographic area are as follows:

	(Stated in millions)

	2014				2013				2012
North America	$	4,885			$	4,858			$	4,868
Latin America		1,969				1,889				1,788
Europe/CIS/Africa		3,640				3,452				3,414
Middle East & Asia		3,446				2,991				2,908
Unallocated (1)		1,456				1,906				1,802
	$	15,396			$	15,096			$	14,780
(1)	Represents seismic vessels, including the related on-board equipment, which frequently transition between geographic areas.

Pension_and_Other_Benefit_Plan

Pension and Other Benefit Plans	12 Months Ended
Pension and Other Benefit Plans	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Pension and Other Benefit Plans	18. Pension and Other Benefit Plans
	Pension Plans
	Schlumberger sponsors several defined benefit pension plans that cover substantially all US employees hired prior to October 1, 2004. The benefits are based on years of service and compensation, on a career-average pay basis.
	In addition to the United States defined benefit pension plans, Schlumberger sponsors several other international defined benefit pension plans. The most significant of these international plans are the International Staff Pension Plan and the UK pension plan (collectively, the “International plans”). The International Staff Pension Plan covers certain international employees hired prior to July 1, 2014 and is based on years of service and compensation on a career-average pay basis. The UK plan covers employees hired prior to April 1, 1999, and is based on years of service and compensation, on a final salary basis.
	The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans were as follows:

		US												International
		2014				2013				2012				2014				2013				2012
	Discount rate		4.85	%			4.25	%			5.5	%			4.76	%			4.38	%			4.95	%
	Compensation increases		4	%			4	%			4	%			4.8	%			4.83	%			4.91	%
	Return on plan assets		7.25	%			7.5	%			7.5	%			7.5	%			7.5	%			7.5	%
	Net pension cost for 2014, 2013 and 2012 included the following components:
		(Stated in millions)

		US												International
		2014				2013				2012				2014				2013				2012
	Service cost - benefits earned during the period	$	72			$	80			$	68			$	126			$	127			$	86
	Interest cost on projected benefit obligation		164				150				152				288				253				241
	Expected return on plan assets		(208	)			(200	)			(185	)			(450	)			(384	)			(328	)
	Amortization of net loss		82				122				95				94				155				76
	Amortization of prior service cost		12				12				12				120				117				120
		$	122			$	164			$	142			$	178			$	268			$	195
	The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans were as follows:
		US								International
		2014				2013				2014				2013
	Discount rate		4.15	%			4.85	%			4.07	%			4.76	%
	Compensation increases		4	%			4	%			4.79	%			4.8	%
	The changes in the projected benefit obligation, plan assets and funded status of the plans were as follows:
		(Stated in millions)

		US								International
		2014				2013				2014				2013
	Change in Projected Benefit Obligations
	Projected benefit obligation at beginning of year	$	3,418			$	3,558			$	5,981			$	5,798
	Service cost		72				80				126				127
	Interest cost		164				150				288				253
	Contributions by plan participants		—				—				122				104
	Actuarial losses (gains)		627				(232	)			1,000				(168	)
	Currency effect		—				—				(90	)			30
	Benefits paid		(144	)			(138	)			(178	)			(163	)
	Projected benefit obligation at end of year	$	4,137			$	3,418			$	7,249			$	5,981
	Change in Plan Assets
	Plan assets at fair value at beginning of year	$	3,269			$	2,910			$	6,246			$	5,120
	Actual return on plan assets		339				356				502				836
	Currency effect		—				—				(102	)			35
	Company contributions		85				141				240				314
	Contributions by plan participants		—				—				122				104
	Benefits paid		(144	)			(138	)			(178	)			(163	)
	Plan assets at fair value at end of year	$	3,549			$	3,269			$	6,830			$	6,246
	(Unfunded Liability) / Asset	$	(588	)		$	(149	)		$	(419	)		$	265
	Amounts Recognized in Balance Sheet
	Postretirement Benefits	$	(588	)		$	(149	)		$	(546	)		$	(5	)
	Other Assets		—				—				127				270
		$	(588	)		$	(149	)		$	(419	)		$	265
	Amounts Recognized in Accumulated Other Comprehensive Loss
	Actuarial losses	$	1,104			$	687			$	1,658			$	882
	Prior service cost		66				78				357				418
		$	1,170			$	765			$	2,015			$	1,300
	Accumulated benefit obligation	$	3,805			$	3,158			$	6,793			$	5,593
	The unfunded liability represents the difference between the plan assets and the projected benefit obligation (“PBO”). The PBO represents the actuarial present value of benefits based on employee service and compensation and includes an assumption about future compensation levels. The accumulated benefit obligation represents the actuarial present value of benefits based on employee service and compensation, but does not include an assumption about future compensation levels.
	The weighted-average allocation of plan assets and the target allocations by asset category are as follows:

		US												International
		Target				2014				2013				Target				2014				2013
Equity securities		37 - 56	%			48	%			50	%			50 - 71	%			58	%			60	%
Debt securities		35 - 62				42				40				20 - 35				32				31
Cash and cash equivalents		0 - 3				2				2				0 - 5				4				3
Alternative investments		0 - 8				8				8				0 - 25				6				6
		100	%			100	%			100	%			100	%			100	%			100	%
Asset performance is monitored frequently with an overall expectation that plan assets will meet or exceed the weighted index of its target asset allocation and component benchmark over rolling five-year periods.
The expected long-term rate of return on assets assumptions reflect the average rate of earnings expected on funds invested or to be invested. The assumptions have been determined based on expectations regarding future rates of return for the portfolio considering the asset allocation and related historical rates of return. The appropriateness of the assumptions is reviewed annually.
The fair value of Schlumberger’s pension plan assets at December 31, 2014 and 2013, by asset category, is presented below and was determined based on valuation techniques categorized as follows:
●	Level One: The use of quoted prices in active markets for identical instruments.
●	Level Two: The use of quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in markets that are not active or other inputs that are observable in the market or can be corroborated by observable market data.
●	Level Three: The use of significant unobservable inputs that typically require the use of management’s estimates of assumptions that market participants would use in pricing.
	(Stated in millions)

	US Plan Assets
	2014																2013
	Total				Level				Level				Level				Total				Level				Level		Level
	Total				One				Two				Three				Total				One				Two		Three
Asset Category:
Cash and Cash Equivalents	$	59			$	40			$	19			$	—			$	77			$	24			$	53	$	—
Equity Securities:
US (a)		1,149				622				527								1,068				625				443
International (b)		552				433				119								572				454				118
Debt Securities:
Corporate bonds (c)		654								654								548								548
Government and government-related debt securities (d)		735				175				560								639				161				478
Collateralized mortgage obligations and mortgage backed securities (e)		107								107								99								99
Alternative Investments:
Private equity (f)		210												210				204										204
Real estate (g)		83												83				62										62
Total	$	3,549			$	1,270			$	1,986			$	293			$	3,269			$	1,264			$	1,739	$	266

	(Stated in millions)

	International Plan Assets
	2014																2013
	Total				Level				Level				Level				Total				Level				Level		Level
	Total				One				Two				Three				Total				One				Two		Three
Asset Category:
Cash and Cash Equivalents	$	264			$	174			$	90			$	—			$	267			$	127			$	140	$	—
Equity Securities:
US (a)		2,432				1,757				675								2,175				1,603				572
International (b)		1,534				1,047				487								1,566				990				576
Debt Securities:
Corporate bonds (c)		780								780								576								576
Government and government-related debt securities (d)		1,181				8				1,173								997				6				991
Collateralized mortgage obligations and mortgage backed securities (e)		256								256								301								301
Alternative Investments:
Private equity (f)		246												246				206										206
Real estate (g)		49												49				60										60
Other		88												88				98										98
Total	$	6,830			$	2,986			$	3,461			$	383			$	6,246			$	2,726			$	3,156	$	364
(a)	US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.
(b)	International equities are invested in companies that are traded on exchanges outside the US and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.
(c)	Corporate bonds consist primarily of investment grade bonds from diversified industries.
(d)	Government and government-related debt securities are comprised primarily of inflation-protected US treasuries and, to a lesser extent, other government-related securities.
(e)	Collateralized mortgage obligations and mortgage backed-securities are debt obligations that represent claims to the cash flows from pools of mortgage loans which are purchased from banks, mortgage companies, and other originators and then assembled into pools by governmental, quasi-governmental and private entities.
(f)	Private equity includes investments in several fund of funds limited partnerships.
(g)	Real estate primarily includes investments in real estate limited partnerships, concentrated in commercial real estate.
Schlumberger’s funding policy is to annually contribute amounts that are based upon a number of factors including the actuarial accrued liability, amounts that are deductible for income tax purposes, legal funding requirements and available cash flow. Schlumberger currently anticipates contributing approximately $400 million to its postretirement benefit plans in 2015, subject to market and business conditions.
Postretirement Benefits Other Than Pensions
Schlumberger provides certain healthcare benefits to certain former US employees who have retired. During the fourth quarter of 2014 Schlumberger announced that, effective April 1, 2015, it will change the way it provides healthcare coverage to certain retirees who are age 65 and over. Under the amended plan, these retirees will transfer to individual coverage under the Medicare Exchange. Schlumberger will subsidize the cost of the program by providing these retirees with a Health Reimbursement Account. The annual subsidy may be increased based on medical cost inflation, but it will not be increased more than 5% in any given year. The benefit obligation relating to these retirees represents approximately 66% of Schlumberger’s total accumulated benefit obligation for postretirement benefits other than pensions as of December 31, 2014.
The actuarial assumptions used to determine the accumulated postretirement benefit obligation and net periodic benefit cost for the US postretirement medical plan were as follows:

	Benefit Obligation at December 31,								Net Periodic Benefit
	Benefit Obligation at December 31,								Cost for the year
	2014				2013				2014				2013				2012
Discount rate		4.15	%			4.85	%			4.85	%			4.25	%			5	%
Return on plan assets		—				—				7	%			7	%			7	%
Current medical cost trend rate		7	%			7.25	%			7.25	%			7.5	%			8	%
Ultimate medical cost trend rate		5	%			5	%			5	%			5	%			5	%
Year that the rate reaches the ultimate trend rate		2023				2023				2023				2023				2018
The net periodic benefit cost for the US postretirement medical plan included the following components:

	(Stated in millions)

	2014				2013				2012
Service cost — benefits earned during the period	$	43			$	48			$	29
Interest cost on projected benefit obligation		60				56				58
Expected return on plan assets		(45	)			(37	)			(30	)
Amortization of net loss		1				23				16
Amortization of prior service credit		(4	)			(4	)			(7	)
	$	55			$	86			$	66
The changes in the accumulated postretirement benefit obligation, plan assets and funded status were as follows:

	(Stated in millions)

	2014				2013
Change in Accumulated Postretirement Benefit Obligation
Benefit obligation at beginning of year	$	1,247			$	1,410
Service cost		43				48
Interest cost		60				56
Contributions by plan participants		6				6
Actuarial losses (gains)		210				(232	)
Benefits paid		(46	)			(41	)
Plan amendments		(299	)			—
Benefit obligation at end of year	$	1,221			$	1,247
Change in Plan Assets
Plan assets at fair value at beginning of year	$	731			$	576
Company contributions		65				83
Contributions by plan participants		6				6
Benefits paid		(46	)			(41	)
Actual return on plan assets		98				107
Plan assets at fair value at end of year	$	854			$	731
Unfunded Liability	$	(367	)		$	(516	)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial losses	$	242			$	87
Prior service credit		(307	)			(12	)
	$	(65	)		$	75
The unfunded liability is included in Postretirement Benefits in the Consolidated Balance Sheet.
The assets of the US postretirement medical plan are invested 60% in equity securities and 40% in debt securities at December 31, 2014. The fair value of these assets was primarily determined based on Level Two valuation techniques.
Assumed health care cost trend rates have a significant effect on the amounts reported for the US postretirement medical plan. A one percentage point change in assumed health care cost trend rates would have the following effects:

	(Stated in millions)

	One percentage				One percentage
	point increase				point decrease
Effect on total service and interest cost components	$	42			$	(17	)
Effect on accumulated postretirement benefit obligation	$	37			$	(33	)
Other Information
The expected benefits to be paid under the US and International pension plans as well as the postretirement medical plan were as follows:

	(Stated in millions)

	Pension Benefits								Postretirement
	US				International				Medical Plan
2015	$	155			$	222			$	46
2016		162				240				49
2017		171				256				52
2018		181				274				56
2019		190				290				59
2020 - 2024		1,112				1,675				344
Included in Accumulated other comprehensive loss at December 31, 2014 are non-cash pretax charges which have not yet been recognized in net periodic benefit cost. The estimated portion of each component of Accumulated other comprehensive loss which is expected to be recognized as a component of net periodic benefit cost during the year ending December 31, 2015 is as follows:

	(Stated in millions)

	Pension				Postretirement
	Plans				Medical Plan
Net actuarial losses	$	274			$	17
Prior service cost (credit)	$	133			$	(32	)
In addition to providing defined pension benefits and a postretirement medical plan, Schlumberger and its subsidiaries have other deferred benefit programs, primarily profit sharing and defined contribution pension plans. Expenses for these programs were $749 million, $671 million and $620 million in 2014, 2013 and 2012, respectively.

Supplementary_Information

Supplementary Information	12 Months Ended
Supplementary Information	Dec. 31, 2014
Segment Reporting [Abstract]
Supplementary Information	19. Supplementary Information
	Cash paid for interest and income taxes was as follows:
		(Stated in millions)

		2014			2013			2012
	Interest	$	389		$	369		$	313
	Income taxes	$	2,048		$	1,729		$	1,736
	Interest and other income includes the following:
		(Stated in millions)

		2014			2013			2012
	Interest income	$	51		$	33		$	30
	Earnings of equity method investments		240			132			142
		$	291		$	165		$	172
	The change in Allowance for doubtful accounts is as follows:
		(Stated in millions)

		2014			2013			2012
	Balance at beginning of year	$	384		$	202		$	177
	Provision		39			205			37
	Amounts written off		(148	)		(23	)		(10	)
	Divestiture of business		—			—			(2	)
	Balance at end of year	$	275		$	384		$	202

	Accounts payable and accrued liabilities are summarized as follows:
		(Stated in millions)

		2014			2013
	Payroll, vacation and employee benefits	$	1,899		$	1,910
	Trade		4,344			4,155
	Other		3,003			2,772
		$	9,246		$	8,837

Discontinued_Operations

Discontinued Operations	12 Months Ended
Discontinued Operations	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	20. Discontinued Operations
	During the second quarter of 2013, Schlumberger completed the wind down of its operations in Iran and, therefore, has classified the historical results of this business as a discontinued operation.
	During the second quarter of 2012, Schlumberger sold its Wilson distribution business to National Oilwell Varco Inc. (“NOV”) for $906 million in cash, resulting in a pretax gain of $137 million ($16 million after-tax). During the third quarter of 2012, Schlumberger completed the sale of its 56% interest in CE Franklin Ltd. to NOV for $122 million in cash, resulting in a pretax gain of $30 million ($12 million after-tax). As Wilson and CE Franklin comprised Schlumberger’s entire Distribution segment, the results of this entire segment have been classified as discontinued operations in the Consolidated Statement of Income.
	The following table summarizes the results of these discontinued operations:
		(Stated in millions)

		2014			2013			2012
	Revenue	$	—		$	102		$	1,399
	(Loss) income before taxes	$	(205	)	$	(63	)	$	274
	Tax expense		—			(6	)		(37	)
	Net income attributable to noncontrolling interests		—			—			(5	)
	Gain on divestitures, net of tax		—			—			28
	Income (loss) from discontinued operations	$	(205	)	$	(69	)	$	260

Summary_of_Accounting_Policies1

Summary of Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Principles of Consolidation

Use of Estimates

Revenue Recognition

Translation of Non-United States Currencies

Short-term and Fixed Income Investments

For purposes of the Consolidated Statement of Cash Flows, Schlumberger does not consider Short-term investments to be cash equivalents.

Inventories

Inventories are stated at average cost or at market, whichever is lower. Costs included in Inventories consist of materials, direct labor and manufacturing overhead.

Investments in Affiliated Companies

Equity and cost method investments as well as investments in publicly traded companies are classified as Investments in Affiliated Companies in the Consolidated Balance Sheet.

Fixed Assets and Depreciation

Multiclient Seismic Data

Schlumberger Production Management

Goodwill, Intangible Assets and Long-lived Assets

Schlumberger has the option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the two-step goodwill impairment test.

Taxes on Income

Schlumberger generally does not provide income taxes relating to undistributed earnings, as the earnings either would not be taxable when remitted or are considered to be indefinitely reinvested.

Concentration of Credit Risk

Research & Engineering

All research and engineering expenditures are expensed as incurred.

Earnings per Share

The following is a reconciliation from basic to diluted earnings per share from continuing operations of Schlumberger for each of the last three years:

(Stated in millions except per share amounts)

Schlumberger

Weighted

Earnings

Income from

Average

Per Share

Continuing

from

Operations

Outstanding

Continuing

Operations

2014:00:00

Basic

5,643

1,295

4.36

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

5,643

1,308

4.31

2013:00:00

Basic

6,801

1,323

5.14

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

6,801

1,333

5.1

2012:00:00

Basic

5,230

1,330

3.93

Assumed exercise of stock options

—

Unvested restricted stock

—

Diluted

5,230

1,339

3.91

Recently Issued Accounting Pronouncements

Pension_and_Other_Benefit_Plan1

Pension and Other Benefit Plans (Tables)	12 Months Ended
Pension and Other Benefit Plans (Tables)	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Fair Value of Schlumberger's Pension Plan Assets	ERROR: Could not retrieve Word content for note block
Weighted-Average Assumed Discount Rate, Compensation Increases and Expected Long-Term Rate of Return on Plan Assets Used to Determine Net Pension Cost for US and International Plans	The weighted-average assumed discount rate, compensation increases and the expected long-term rate of return on plan assets used to determine the net pension cost for the US and International plans were as follows:

		US									International
		2014			2013			2012			2014			2013			2012
	Discount rate		4.85	%		4.25	%		5.5	%		4.76	%		4.38	%		4.95	%
	Compensation increases		4	%		4	%		4	%		4.8	%		4.83	%		4.91	%
	Return on plan assets		7.25	%		7.5	%		7.5	%		7.5	%		7.5	%		7.5	%

Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan	Net pension cost for 2014, 2013 and 2012 included the following components:
		(Stated in millions)

		US									International
		2014			2013			2012			2014			2013			2012
	Service cost - benefits earned during the period	$	72		$	80		$	68		$	126		$	127		$	86
	Interest cost on projected benefit obligation		164			150			152			288			253			241
	Expected return on plan assets		(208	)		(200	)		(185	)		(450	)		(384	)		(328	)
	Amortization of net loss		82			122			95			94			155			76
	Amortization of prior service cost		12			12			12			120			117			120
		$	122		$	164		$	142		$	178		$	268		$	195

	The net periodic benefit cost for the US postretirement medical plan included the following components:

		(Stated in millions)

		2014			2013			2012
	Service cost — benefits earned during the period	$	43		$	48		$	29
	Interest cost on projected benefit obligation		60			56			58
	Expected return on plan assets		(45	)		(37	)		(30	)
	Amortization of net loss		1			23			16
	Amortization of prior service credit		(4	)		(4	)		(7	)
		$	55		$	86		$	66

Weighted-Average Assumed Discount Rate and Compensation Increases Used to Determine Projected Benefit Obligations for US and International Plans	The weighted-average assumed discount rate and compensation increases used to determine the projected benefit obligations for the US and International plans were as follows:
		US						International
		2014			2013			2014			2013
	Discount rate		4.15	%		4.85	%		4.07	%		4.76	%
	Compensation increases		4	%		4	%		4.79	%		4.8	%

Changes In Projected Benefit Obligation Plan Assets And Funded Status Of Plans [Table Text Block]	The changes in the projected benefit obligation, plan assets and funded status of the plans were as follows:
		(Stated in millions)

		US						International
		2014			2013			2014			2013
	Change in Projected Benefit Obligations
	Projected benefit obligation at beginning of year	$	3,418		$	3,558		$	5,981		$	5,798
	Service cost		72			80			126			127
	Interest cost		164			150			288			253
	Contributions by plan participants		—			—			122			104
	Actuarial losses (gains)		627			(232	)		1,000			(168	)
	Currency effect		—			—			(90	)		30
	Benefits paid		(144	)		(138	)		(178	)		(163	)
	Projected benefit obligation at end of year	$	4,137		$	3,418		$	7,249		$	5,981
	Change in Plan Assets
	Plan assets at fair value at beginning of year	$	3,269		$	2,910		$	6,246		$	5,120
	Actual return on plan assets		339			356			502			836
	Currency effect		—			—			(102	)		35
	Company contributions		85			141			240			314
	Contributions by plan participants		—			—			122			104
	Benefits paid		(144	)		(138	)		(178	)		(163	)
	Plan assets at fair value at end of year	$	3,549		$	3,269		$	6,830		$	6,246
	(Unfunded Liability) / Asset	$	(588	)	$	(149	)	$	(419	)	$	265
	Amounts Recognized in Balance Sheet
	Postretirement Benefits	$	(588	)	$	(149	)	$	(546	)	$	(5	)
	Other Assets		—			—			127			270
		$	(588	)	$	(149	)	$	(419	)	$	265
	Amounts Recognized in Accumulated Other Comprehensive Loss
	Actuarial losses	$	1,104		$	687		$	1,658		$	882
	Prior service cost		66			78			357			418
		$	1,170		$	765		$	2,015		$	1,300
	Accumulated benefit obligation	$	3,805		$	3,158		$	6,793		$	5,593

Weighted-Average Allocation of Plan Assets and Target Allocation by Asset Category	The weighted-average allocation of plan assets and the target allocations by asset category are as follows:

		US									International
		Target			2014			2013			Target			2014			2013
	Equity securities		37 - 56	%		48	%		50	%		50 - 71	%		58	%		60	%
	Debt securities		35 - 62			42			40			20 - 35			32			31
	Cash and cash equivalents		0 - 3			2			2			0 - 5			4			3
	Alternative investments		0 - 8			8			8			0 - 25			6			6
			100	%		100	%		100	%		100	%		100	%		100	%

Defined Benefit Plan Weighted Average Assumptions Used in Calculating Benefit Obligation and Net Periodic Benefit Cost for US Postretirement Medical Plan	The actuarial assumptions used to determine the accumulated postretirement benefit obligation and net periodic benefit cost for the US postretirement medical plan were as follows:

		Benefit Obligation at December 31,						Net Periodic Benefit
		Benefit Obligation at December 31,						Cost for the year
		2014			2013			2014			2013			2012
	Discount rate		4.15	%		4.85	%		4.85	%		4.25	%		5	%
	Return on plan assets		—			—			7	%		7	%		7	%
	Current medical cost trend rate		7	%		7.25	%		7.25	%		7.5	%		8	%
	Ultimate medical cost trend rate		5	%		5	%		5	%		5	%		5	%
	Year that the rate reaches the ultimate trend rate		2023			2023			2023			2023			2018

Changes in Accumulated Postretirement Benefit Obligation, Plan Assets and Funded Status	The changes in the accumulated postretirement benefit obligation, plan assets and funded status were as follows:

		(Stated in millions)

		2014			2013
	Change in Accumulated Postretirement Benefit Obligation
	Benefit obligation at beginning of year	$	1,247		$	1,410
	Service cost		43			48
	Interest cost		60			56
	Contributions by plan participants		6			6
	Actuarial losses (gains)		210			(232	)
	Benefits paid		(46	)		(41	)
	Plan amendments		(299	)		—
	Benefit obligation at end of year	$	1,221		$	1,247
	Change in Plan Assets
	Plan assets at fair value at beginning of year	$	731		$	576
	Company contributions		65			83
	Contributions by plan participants		6			6
	Benefits paid		(46	)		(41	)
	Actual return on plan assets		98			107
	Plan assets at fair value at end of year	$	854		$	731
	Unfunded Liability	$	(367	)	$	(516	)
	Amounts Recognized in Accumulated Other Comprehensive Loss
	Actuarial losses	$	242		$	87
	Prior service credit		(307	)		(12	)
		$	(65	)	$	75

Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates	Assumed health care cost trend rates have a significant effect on the amounts reported for the US postretirement medical plan. A one percentage point change in assumed health care cost trend rates would have the following effects:

		(Stated in millions)

		One percentage			One percentage
		point increase			point decrease
	Effect on total service and interest cost components	$	42		$	(17	)
	Effect on accumulated postretirement benefit obligation	$	37		$	(33	)

Expected Benefits to be Paid Under US and International Pension Plans and Postretirement Medical Plan	The expected benefits to be paid under the US and International pension plans as well as the postretirement medical plan were as follows:

		(Stated in millions)

		Pension Benefits						Postretirement
		US			International			Medical Plan
	2015	$	155		$	222		$	46
	2016		162			240			49
	2017		171			256			52
	2018		181			274			56
	2019		190			290			59
	2020 - 2024		1,112			1,675			344

Defined Benefit Plan, Amounts that will be Amortized from Accumulated Other Comprehensive Income (Loss) In Next Fiscal Year	Included in Accumulated other comprehensive loss at December 31, 2014 are non-cash pretax charges which have not yet been recognized in net periodic benefit cost. The estimated portion of each component of Accumulated other comprehensive loss which is expected to be recognized as a component of net periodic benefit cost during the year ending December 31, 2015 is as follows:

		(Stated in millions)

		Pension			Postretirement
		Plans			Medical Plan
	Net actuarial losses	$	274		$	17
	Prior service cost (credit)	$	133		$	(32	)

Summary_of_Accounting_Policies2

Summary of Accounting Policies (Tables)	12 Months Ended
Summary of Accounting Policies (Tables)	Dec. 31, 2014
Accounting Policies [Abstract]
Reconciliation of Earnings Per Share from Continuing Operations	The following is a reconciliation from basic to diluted earnings per share from continuing operations of Schlumberger for each of the last three years:

		(Stated in millions except per share amounts)

		Schlumberger		Weighted		Earnings
		Income from		Average		Per Share
		Continuing		Shares		from
		Operations		Outstanding		Continuing
						Operations
	2014:00:00
	Basic	$	5,643		1,295	$	4.36
	Assumed exercise of stock options		—		9
	Unvested restricted stock		—		4
	Diluted	$	5,643		1,308	$	4.31

	2013:00:00
	Basic	$	6,801		1,323	$	5.14
	Assumed exercise of stock options		—		6
	Unvested restricted stock		—		4
	Diluted	$	6,801		1,333	$	5.1

	2012:00:00
	Basic	$	5,230		1,330	$	3.93
	Assumed exercise of stock options		—		5
	Unvested restricted stock		—		4
	Diluted	$	5,230		1,339	$	3.91

Charges_and_Credits_Tables

Charges and Credits (Tables)	12 Months Ended
Charges and Credits (Tables)	Dec. 31, 2014
Restructuring And Related Activities [Abstract]
Summary of the Charges	The following is a summary of these charges:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	WesternGeco restructuring	$	806		$	25	$	781		Impairments & other
	Currency devaluation loss in Venezuela		472			—		472		Impairments & other
	Workforce reduction		296			37		259		Impairments & other
	Impairment of SPM project		199			72		127		Impairments & other
		$	1,773		$	134	$	1,639

	The following is a summary of these charges and credits:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	Gain on formation of OneSubsea joint venture	$	(1,028	)	$	—	$	(1,028	)	Gain on formation of OneSubsea
	Impairment of equity-method investments		364			19		345		Impairments & other
	Provision for accounts receivable		152			30		122		Cost of revenue
	Currency devaluation loss in Venezuela		92			—		92		Impairments & other
		$	(420	)	$	49	$	(469	)

	The following is a summary of these charges:
		(Stated in millions)

		Pretax			Tax		Net			Classification
	Merger and integration-related costs	$	128		$	16	$	112		Merger & integration
	Workforce reduction		33			6		27		Impairments & other
		$	161		$	22	$	139

Inventories_Tables

Inventories (Tables)	12 Months Ended
Inventories (Tables)	Dec. 31, 2014
Inventory Disclosure [Abstract]
Inventory Disclosure	A summary of inventories follows:
		(Stated in millions)

		2014		2013
	Raw materials & field materials	$	2,666	$	2,539
	Work in process		273		261
	Finished goods		1,689		1,803
		$	4,628	$	4,603

Fixed_Assets_Tables

Fixed Assets (Tables)	12 Months Ended
Fixed Assets (Tables)	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	A summary of fixed assets follows:
		(Stated in millions)

		2014		2013
	Land	$	445	$	394
	Buildings & improvements		3,733		3,534
	Machinery & equipment		31,937		29,332
	Seismic vessels		849		1,904
			36,964		35,164
	Less accumulated depreciation		21,568		20,068
		$	15,396	$	15,096

Multiclient_Seismic_Data_Table

Multiclient Seismic Data (Tables)	12 Months Ended
Multiclient Seismic Data (Tables)	Dec. 31, 2014
Multiclient Seismic Data [Abstract]
Multiclient Seismic Data	The change in the carrying amount of multiclient seismic data is as follows:
		(Stated in millions)

		2014			2013
	Balance at beginning of year	$	667		$	518
	Capitalized in year		321			394
	Charged to expense		(195	)		(245	)
		$	793		$	667

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
Goodwill (Tables)	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill by reporting unit were as follows:
											(Stated in millions)
		Reservoir			Drilling			Production			Total
		Characterization			Drilling			Production			Total
	Balance at January 1, 2013	$	3,760		$	8,337		$	2,488			$	14,585
	Acquisitions		4			3			336				343
	Divestiture of business		—			—			(150	)			(150	)
	Other		(27	)		(25	)		(20	)			(72	)
	Balance, December 31, 2013		3,737			8,315			2,654				14,706
	Acquisitions		15			271			551				837
	Reallocation		83			(83	)		—				—
	Other		(23	)		(15	)		(18	)			(56	)
	Balance, December 31, 2014	$	3,812		$	8,488		$	3,187			$	15,487

Intangible_Assets_Tables

Intangible Assets (Tables)	12 Months Ended
Intangible Assets (Tables)	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets by Major Class	A summary of intangible assets follows:
		(Stated in millions)

		2014						2013
		Gross		Accumulated		Net Book		Gross		Accumulated		Net Book
		Book Value		Amortization		Value		Book Value		Amortization		Value
	Technology/Technical Know-How	$	1,747	$	535	$	1,212	$	1,960	$	597	$	1,363
	Tradenames		1,641		319		1,322		1,647		257		1,390
	Customer Relationships		2,531		523		2,008		2,263		407		1,856
	Other		380		268		112		435		335		100
		$	6,299	$	1,645	$	4,654	$	6,305	$	1,596	$	4,709

Longterm_Debt_and_Debt_Facilit1

Long-term Debt and Debt Facility Agreements (Tables)	12 Months Ended
Long-term Debt and Debt Facility Agreements (Tables)	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt consists of the following:
		(Stated in millions)

		2014		2013
	3.30% Senior Notes due 2021	$	1,597	$	1,596
	3.65% Senior Notes due 2023		1,495		1,495
	2.75% Guaranteed Notes due 2015 (1)		—		1,373
	1.95% Senior Notes due 2016		1,100		1,099
	4.20% Senior Notes due 2021		1,100		1,099
	1.25% Senior Notes due 2017		1,000		999
	2.40% Senior Notes due 2022		999		999
	1.50% Guaranteed Notes due 2019(1)		628		697
	2.65% Senior Notes due 2016 (2)		500		500
	Commercial paper borrowings		1,538		—
	Other		608		536
		$	10,565	$	10,393
	(1)	Schlumberger maintains a €5.0 billion Guaranteed Euro Medium Term Note program that provides for the issuance of various types of debt instruments such as fixed or floating rate notes in euro, US dollar or other currencies. The following is a summary of outstanding debt that was issued under this program:
	·	Schlumberger issued €0.5 billion 1.50% Guaranteed Notes due 2019 in the fourth quarter of 2013. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate equal to three-month LIBOR plus approximately 64 basis points.
	·	Schlumberger issued €1.0 billion 2.75% Guaranteed Notes due 2015 in the fourth quarter of 2010. Schlumberger entered into agreements to swap these euro notes for US dollars on the date of issue until maturity, effectively making this a US dollar denominated debt on which Schlumberger will pay interest in US dollars at a rate of 2.56%.
	(2)	Schlumberger entered into agreements to swap these dollar notes for euros on the date of issue until maturity, effectively making this a euro-denominated debt on which Schlumberger pays interest in euros at a rate of 2.39%.

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
Derivative Instruments and Hedging Activities (Tables)	Dec. 31, 2014
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair Values of Outstanding Derivative Instruments	The fair values of outstanding derivative instruments are summarized as follows:

		(Stated in millions)

		Fair Value of Derivatives						Consolidated Balance Sheet Classification
	Derivative Assets
	Derivative Assets	2014			2013
	Derivatives designated as hedges:
	Foreign exchange contracts	$	3		$	98		Other current assets
	Foreign exchange contracts		32			24		Other Assets
	Cross currency swap		—			27		Other Assets
			35			149
	Derivatives not designated as hedges:
	Foreign exchange contracts		5			10		Other current assets
	Foreign exchange contracts		—			4		Other Assets
			5			14
		$	40		$	163
	Derivative Liabilities
	Derivatives designated as hedges:
	Foreign exchange contracts	$	80		$	14		Accounts payable and accrued liabilities
	Foreign exchange contracts		105			1		Other Liabilities
	Cross currency swap		42			—		Other Liabilities
			227			15
	Derivatives not designated as hedges:
	Foreign exchange contracts		28			2		Accounts payable and accrued liabilities

		$	255		$	17

Effect of Derivative Instruments Designated as Fair Value Hedges and Not Designated as Hedges on Consolidated Statement of Income	The effect of derivative instruments designated as fair value hedges and those not designated as hedges on the Consolidated Statement of Income was as follows:
		(Stated in millions)

		Gain (Loss) Recognized in Income								Consolidated Statement of
		2014			2013			2012		Income Classification
	Derivatives designated as fair value hedges:
	Cross currency swap	$	(82	)	$	15		$	1	Interest expense

	Derivatives not designated as hedges:
	Foreign exchange contracts	$	(95	)	$	(2	)	$	5	Cost of revenue
	Commodity contracts		—			—			1	Cost of revenue
		$	(95	)	$	(2	)	$	6

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
Stockholders' Equity (Tables)	Dec. 31, 2014
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss consists of the following:
		(Stated in millions)

		Currency			Cash Flow			Pension and			Unrealized			Total
		Translation			Hedges			Other			Gains on Marketable
		Adjustments						Postretirement			Securities
								Benefit Plans
	Balance, January 1, 2012	$	(993	)	$	(26	)	$	(2,538	)	$	—		$	(3,557	)
	Other comprehensive income (loss) before reclassifications		76			92			(1,016	)		141			(707	)
	Amounts reclassified from accumulated other comprehensive loss		—			(36	)		312			—			276
	Income taxes		—			—			100			—			100
	Balance, December 31, 2012		(917	)		30			(3,142	)		141			(3,888	)
	Other comprehensive income (loss) before reclassifications		(151	)		49			1,328			35			1,261
	Amounts reclassified from accumulated other comprehensive loss		—			(50	)		425			—			375
	Income taxes		—			—			(302	)		—			(302	)
	Balance, December 31, 2013		(1,068	)		29			(1,691	)		176			(2,554	)
	Other comprehensive income (loss) before reclassifications		(463	)		(238	)		(1,285	)		(166	)		(2,152	)
	Amounts reclassified from accumulated other comprehensive loss		—			113			305			—			418
	Income taxes		—			—			82			—			82
	Balance, December 31, 2014	$	(1,531	)	$	(96	)	$	(2,589	)	$	10		$	(4,206	)

Stockbased_Compensation_Plans_

Stock-based Compensation Plans (Tables)	12 Months Ended
Stock-based Compensation Plans (Tables)	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Weighted Average Assumptions Used in Estimating Fair Value of Stock Options	The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions and resulting weighted-average fair value per share:

		2014			2013			2012
	Dividend yield		1.6	%		1.7	%		1.5	%
	Expected volatility		37	%		38	%		39	%
	Risk free interest rate		2.2	%		1.2	%		1.5	%
	Expected option life in years		7			7			6.9
	Weighted-average fair value per share	$	34.2		$	23.93		$	25.26

Options Outstanding and Option Exercisable	The following table summarizes information concerning options outstanding and options exercisable as of December 31, 2014:

			(Shares stated in thousands)

			Options Outstanding									Options Exercisable
	Exercise prices range		Options			Weighted-			Weighted-			Options			Weighted-
			Outstanding			average			average			Exercisable			average
						remaining			exercise						exercise
						contractual life			price						price
						(in years)
	$32.45 - $67.87			6,553			3.2		$	51.5			6,295		$	51.03
	$68.51 - $70.93			8,346			6.9		$	69.82			3,648		$	69.02
	$72.11 - $78.31			7,553			7.2		$	72.56			1,915		$	72.47
	$83.88 - $84.93			8,045			5.2		$	84.17			5,118		$	84.34
	$88.61 - $114.83			8,086			8.1		$	97.78			1,566		$	95.92
				38,583			6.2		$	76.1			18,542		$	69.77

Summary of Stock Option Activity	The following table summarizes stock option activity during the years ended December 31, 2014, 2013 and 2012:

		(Shares stated in thousands)

		2014						2013						2012
		Shares			Weighted-			Shares			Weighted-			Shares			Weighted-
					average						average						average
					exercise						exercise						exercise
					price						price						price
	Outstanding at beginning of year		41,939		$	70.33			42,059		$	67.77			40,027		$	63.84
	Granted		6,105		$	99.04			6,570		$	72.16			8,664		$	72.04
	Exercised		(8,269	)	$	64.19			(5,168	)	$	51.73			(4,171	)	$	39.07
	Forfeited		(1,192	)	$	73.56			(1,522	)	$	70.57			(2,461	)	$	67.5
	Outstanding at year-end		38,583		$	76.1			41,939		$	70.33			42,059		$	67.77

Restricted Stock Transactions	The following table summarizes information about all restricted stock transactions:

		(Shares stated in thousands)

		2014						2013						2012
		Restricted			Weighted			Restricted			Weighted			Restricted			Weighted
		Stock			Average			Stock			Average			Stock			Average
					Grant Date						Grant Date						Grant Date
					Fair Value						Fair Value						Fair Value
	Unvested at beginning of year		4,171		$	76.01			3,566		$	73.62			2,433		$	72.25
	Granted		1,341			96.08			1,949			75.65			1,668			71.09
	Vested		(1,186	)		81.59			(958	)		66.98			(351	)		52.26
	Forfeited		(188	)		78.68			(386	)		74.53			(184	)		73.38
	Unvested at end of year		4,138		$	80.8			4,171		$	76.01			3,566		$	73.62

Assumptions Used in Estimating Fair Value of Purchase Rights under Discounted Stock Purchase Plan	The fair value of the employees’ purchase rights under the DSPP was estimated using the Black-Scholes model with the following assumptions and resulting weighted average fair value per share:

		2014			2013			2012
	Dividend yield		1.6	%		1.7	%		1.6	%
	Expected volatility		19	%		24	%		41	%
	Risk free interest rate		0.1	%		0.1	%		0.2	%
	Weighted average fair value per share	$	12.67		$	9.91		$	12.71

Stock-Based Compensation Expense Recognized in Income	The following summarizes stock-based compensation expense recognized in income:

		(Stated in millions)

		2014			2013			2012
	Stock options	$	177		$	165		$	203
	Restricted stock		114			110			82
	DSPP		38			40			50
		$	329		$	315		$	335

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure Table	Income from continuing operations before taxes which were subject to United States and non-United States income taxes for each of the three years ended December 31, were as follows:
		(Stated in millions)

		2014			2013			2012
	United States	$	1,990		$	1,904		$	1,980
	Outside United States		5,649			6,787			4,979
		$	7,639		$	8,691		$	6,959

Components of Net Deferred Tax Assets	The components of net deferred tax assets (liabilities) were as follows:
		(Stated in millions)

		2014			2013
	Postretirement benefits	$	327		$	236
	Intangible assets		(1,435	)		(1,502	)
	Investments in non-US subsidiaries		(227	)		(282	)
	Other, net		183			128
		$	(1,152	)	$	(1,420	)

Components of Consolidated Income Taxes	The components of Taxes on income were as follows:
		(Stated in millions)

		2014			2013			2012
	Current:
	United States - Federal	$	718		$	682		$	698
	United States - State		51			60			53
	Outside United States		1,380			1,211			1,025
		$	2,149		$	1,953		$	1,776
	Deferred:
	United States - Federal	$	(194	)	$	(109	)	$	(105	)
	United States - State		(9	)		(4	)		(7	)
	Outside United States		(12	)		34			22
	Valuation allowance		(6	)		(26	)		14
		$	(221	)	$	(105	)	$	(76	)
		$	1,928		$	1,848		$	1,700

Reconciliation of US Statutory Federal Tax Rate	A reconciliation of the United States statutory federal tax rate (35%) to the consolidated effective tax rate is:

		2014			2013			2012
	US statutory federal rate		35	%		35	%		35	%
	Non-US income taxed at different rates		(11	)		(12	)		(10	)
	Charges and credits (See Note 3)		3			(2	)		—
	Other		(2	)		—			(1	)
			25	%		21	%		24	%

Reconciliation of Liabilities Associated with Uncertain Tax Provisions	A reconciliation of the beginning and ending amount of liabilities associated with uncertain tax positions for the years ended December 31, 2014, 2013 and 2012 is as follows:
		(Stated in millions)

		2014			2013			2012
	Balance at beginning of year	$	1,452		$	1,453		$	1,353
	Additions based on tax positions related to the current year		154			146			156
	Additions for tax positions of prior years		96			109			98
	Additions related to acquisitions		43			—			—
	Impact of changes in exchange rates		(62	)		(47	)		12
	Settlements with tax authorities		(27	)		(64	)		(17	)
	Reductions for tax positions of prior years		(212	)		(109	)		(103	)
	Reductions due to the lapse of the applicable statute of limitations		(42	)		(36	)		(46	)
	Balance at end of year	$	1,402		$	1,452		$	1,453

Tax Years Subject to Examination by Tax Authorities	The following table summarizes the tax years that are either currently under audit or remain open and subject to examination by the tax authorities in the most significant jurisdictions in which Schlumberger operates:

	Brazil		2009 - 2014
	Canada		2007 - 2014
	Ecuador		2001 - 2014
	Mexico		2007 - 2014
	Norway		2013 - 2014
	Russia		2011 - 2014
	Saudi Arabia		2001 - 2014
	United Kingdom		2009 - 2014
	United States		2011 - 2014

Leases_and_Lease_Commitments_T

Leases and Lease Commitments (Tables)	12 Months Ended
Leases and Lease Commitments (Tables)	Dec. 31, 2014
Leases [Abstract]
Future Minimum Rental Commitments Under Noncancelable Operating Leases	Future minimum rental commitments under noncancelable operating leases for each of the next five years are as follows:

	(Stated in millions)

	2015	$	330
	2016		259
	2017		197
	2018		156
	2019		134
	Thereafter		554
		$	1,630

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
Segment Information (Tables)	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Financial information for the years ended December 31, 2014, 2013 and 2012, by segment, is as follows:

		(Stated in millions)

		2014
		Revenue			Income			Assets		Depreciation		Capital
					before					and		Expenditures
					taxes					Amortization
	Reservoir Characterization	$	12,224		$	3,607		$	8,596	$	1,391	$	1,152
	Drilling		18,462			3,872			11,378		1,174		1,328
	Production		18,111			3,227			11,848		1,133		1,246
	Eliminations & other		(217	)		(130	)		1,577		198		250
	Pretax operating income					10,576
	Goodwill and intangible assets								20,142
	All other assets								2,185
	Corporate (1)					(848	)		11,178		198
	Interest income (2)					31
	Interest expense (3)					(347	)
	Charges & credits (4)					(1,773	)
		$	48,580		$	7,639		$	66,904	$	4,094	$	3,976

		(Stated in millions)

		2013
		Revenue			Income			Assets		Depreciation		Capital
					before					and		Expenditures
					taxes					Amortization
	Reservoir Characterization	$	12,463		$	3,660		$	8,918	$	1,338	$	1,275
	Drilling		17,099			3,293			10,940		1,077		1,291
	Production		15,927			2,619			11,185		1,039		1,204
	Eliminations & other		(223	)		(228	)		1,974		217		173
	Pretax operating income					9,344
	Goodwill and intangible assets								19,415
	All other assets								2,618
	Corporate (1)					(726	)		12,050		208
	Interest income (2)					22
	Interest expense (3)					(369	)
	Charges & credits (4)					420
		$	45,266		$	8,691		$	67,100	$	3,879	$	3,943

		(Stated in millions)
		2012
		Revenue			Income			Assets		Depreciation and		Capital
					before					Amortization		Expenditures
					taxes
	Reservoir Characterization	$	11,360		$	3,080		$	8,501	$	1,309	$	1,235
	Drilling		15,691			2,778			11,316		1,072		1,668
	Production		14,802			2,327			9,889		877		1,439
	Eliminations & other		(122	)		(68	)		1,920		191		352
	Pretax operating income					8,117
	Goodwill and intangible assets								19,387
	Discontinued operations assets								246
	All other assets								2,267
	Corporate (1)					(696	)		8,021		198
	Interest income (2)					30
	Interest expense (3)					(331	)
	Charges & credits (4)					(161	)
		$	41,731		$	6,959		$	61,547	$	3,647	$	4,694

	(1)	Comprised principally of certain corporate expenses not allocated to the segments, interest on postretirement medical benefits, stock-based compensation costs, amortization expense associated with certain intangible and other nonoperating items. Corporate assets consist of cash, short-term investments, fixed income investments, held to maturity and investments in affiliates.
	(2)	Interest income excludes amounts which are included in the segments’ income (2014: $20 million; 2013: $11 million; 2012: $- million).
	(3)	Interest expense excludes amounts which are included in the segments’ income (2014: $22 million; 2013: $22 million; 2012: $9 million).
	(4)	See Note 3 – Charges and Credits.
Revenue by Geographic Area	Revenue by geographic area for the years ended December 31, 2014, 2013 and 2012 is as follows:

		(Stated in millions)

		2014			2013			2012
	North America	$	16,151		$	13,897		$	13,535
	Latin America		7,699			7,754			7,554
	Europe/CIS/Africa		12,515			12,411			11,510
	Middle East & Asia		11,875			10,767			8,717
	Eliminations & other		340			437			415
		$	48,580		$	45,266		$	41,731

Fixed Assets Less Accumulated Depreciation by Geographic Area	Fixed Assets less accumulated depreciation by geographic area are as follows:

		(Stated in millions)

		2014			2013			2012
	North America	$	4,885		$	4,858		$	4,868
	Latin America		1,969			1,889			1,788
	Europe/CIS/Africa		3,640			3,452			3,414
	Middle East & Asia		3,446			2,991			2,908
	Unallocated (1)		1,456			1,906			1,802
		$	15,396		$	15,096		$	14,780
	(1)	Represents seismic vessels, including the related on-board equipment, which frequently transition between geographic areas.

Supplementary_Information_Tabl

Supplementary Information (Tables)	12 Months Ended
Supplementary Information (Tables)	Dec. 31, 2014
Segment Reporting [Abstract]
Cash Paid For Interest And Income Taxes [Table Text Block]	Cash paid for interest and income taxes was as follows:
		(Stated in millions)

		2014			2013			2012
	Interest	$	389		$	369		$	313
	Income taxes	$	2,048		$	1,729		$	1,736

Interest and Other Income [Table Text Block]	Interest and other income includes the following:
		(Stated in millions)

		2014			2013			2012
	Interest income	$	51		$	33		$	30
	Earnings of equity method investments		240			132			142
		$	291		$	165		$	172

Change in Allowance for Doubtful Accounts	The change in Allowance for doubtful accounts is as follows:
		(Stated in millions)

		2014			2013			2012
	Balance at beginning of year	$	384		$	202		$	177
	Provision		39			205			37
	Amounts written off		(148	)		(23	)		(10	)
	Divestiture of business		—			—			(2	)
	Balance at end of year	$	275		$	384		$	202

Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities are summarized as follows:
		(Stated in millions)

		2014			2013
	Payroll, vacation and employee benefits	$	1,899		$	1,910
	Trade		4,344			4,155
	Other		3,003			2,772
		$	9,246		$	8,837

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
Discontinued Operations (Tables)	Dec. 31, 2014
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations	The following table summarizes the results of these discontinued operations:
		(Stated in millions)

		2014			2013			2012
	Revenue	$	—		$	102		$	1,399
	(Loss) income before taxes	$	(205	)	$	(63	)	$	274
	Tax expense		—			(6	)		(37	)
	Net income attributable to noncontrolling interests		—			—			(5	)
	Gain on divestitures, net of tax		—			—			28
	Income (loss) from discontinued operations	$	(205	)	$	(69	)	$	260

Summary_of_Accounting_Policies3

Summary of Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Organization And Summary Of Significant Accounting Policies [Line Items]
Transaction Losses of Hedging Activities	($67)	($24)	($37)
Trading Investments		194
Fixed Income Investments, held to maturity	442	363
Fixed Income Investments, held to maturity, 2016	49
Fixed Income Investments, held to maturity, 2017	91
Fixed Income Investments, held to maturity, 2018	298
Fixed Income Investments, held to maturity, 2019	3
Fixed Income Investments, held to maturity, 2020	1
Carrying value of marketable securities	81	81
Fair value of marketable securities	91	257
Employee stock options to purchase	5	12	21
Customer Relationships
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	15 years
Useful life of intangible asset maximum	28 years
Technology/Technical Know-How
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	10 years
Useful life of intangible asset maximum	18 years
Tradenames
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful life of intangible asset minimum	15 years
Useful life of intangible asset maximum	30 years
Schlumberger Production Management
Organization And Summary Of Significant Accounting Policies [Line Items]
Unamortized investments	$1,411	$1,154

Summary_of_Accounting_Policies4

Summary of Accounting Policies - Reconciliation of Earnings Per Share (Detail) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Basic	$5,643	$6,801	$5,230
Diluted	$5,643	$6,801	$5,230
Basic	1,295	1,323	1,330
Assumed exercise of stock options	9	6	5
Unvested restricted stock	4	4	4
Diluted	1,308	1,333	1,339
Basic	$4.36	$5.14	$3.93
Diluted	$4.31	$5.10	$3.91

Charges_and_Credits_Additional

Charges and Credits - Additional Information (Detail)

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2014

Mar. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2012

Dec. 31, 2014

USD ($)

Other Restructuring

Venezuela Bolivar Official Currency Exchange Rate To Dollar

Provision For Accounts Receivable

Gain On Formation Of One Subsea

Impairment And Other

Certain intangible assets

Merger And Integration

Explorer-class vessels

Other seismic assets

USD ($)

VEF

SICAD I

SICAD II

Cost Of Revenue

Gain On Formation Of One Subsea Joint Venture

Impairment Of Equity Method Investments

Severance and other

USD ($)

Merger-related integration costs

USD ($)

Eastern Echo Holdings Plc.

Lease termination costs

VEF

USD ($)

VEF

USD ($)

Drilling Related Technology

Contract Drilling

USD ($)

Vessel

Charges And Credits [Line Items]

Vessel termination, description

Three previous-generation acquisition vessels with lower towing capacity and higher operating costs will be converted to source vessels, allowing for the termination of two third-party source vessel leases and the retirement of two owned source vessels.

Impairment charge, Pretax

$199

$85

$590

Number of vessels acquired

Restructuring, other pretax charge

131

Exchange rate

6.3

4.3

Exchange rate, approximated

Charges, Pretax

296

Devaluation charge

472

Foreign currency transactions, description

Going forward, this change will result in a reduction in the US dollar reported amount of local currency denominated revenues, expenses and, consequently, income before taxes and net income. For example, if Schlumberger had applied an exchange rate of 50 Venezuelan Bolivares fuertes to the US dollar throughout 2014, it would have reduced Schlumberger earnings by approximately $0.08 per share.

Charges and credits, Pretax

1,773

-420

161

152

-1,028

364

222

142

Charges and credits, Net

-469

122

-1,028

345

Charges, Pretax

$1,773

$161

$296

$33

$128

Charges_and_Credits_Summary_of

Charges and Credits - Summary of Charges (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment In Joint Venture [Line Items]
Charges, Pretax	$1,773		$161
Charges, Tax	134		22
Charges, Net	1,639		139
Charges and credits, Pretax	1,773	-420	161
Charges and credits, Tax		49
Charges and credits, Net		-469
WesternGeco restructuring \| Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	806
Charges, Tax	25
Charges, Net	781
Currency devaluation loss in Venezuela \| Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	472
Charges, Net	472
Charges and credits, Pretax		92
Charges and credits, Net		92
Severance and other \| Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	296		33
Charges, Tax	37		6
Charges, Net	259		27
Impairment of SPM project \| Impairment And Other
Investment In Joint Venture [Line Items]
Charges, Pretax	199
Charges, Tax	72
Charges, Net	127
Gain On Formation Of One Subsea Joint Venture \| Gain On Formation Of One Subsea
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		-1,028
Charges and credits, Net		-1,028
Impairment Of Equity Method Investments \| Impairment And Other
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		364
Charges and credits, Tax		19
Charges and credits, Net		345
Cost Of Revenue \| Provision For Accounts Receivable
Investment In Joint Venture [Line Items]
Charges and credits, Pretax		152
Charges and credits, Tax		30
Charges and credits, Net		122
Merger-related integration costs \| Merger And Integration
Investment In Joint Venture [Line Items]
Charges, Pretax			128
Charges, Tax			16
Charges, Net			$112

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)	12 Months Ended			6 Months Ended	0 Months Ended
Share data in Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Jan. 20, 2015
Business Acquisition [Line Items]
Gain on formation of OneSubsea		$1,028,000,000
Acquisitions and investments, net of cash acquired	1,008,000,000	1,210,000,000	845,000,000
One Subsea
Business Acquisition [Line Items]
Purchase price				600,000,000
Ownership interest in joint venture	40.00%
Gain on formation of OneSubsea				1,028,000,000
Other Acquisitions
Business Acquisition [Line Items]
Acquisitions and investments, net of cash acquired	1,008,000,000	610,000,000	845,000,000
Shares of common stock issued in connection with acquisition	2.1
Value of common stock issued in connection with acquisition	213,000,000
Eurasia Drilling Limited \| Subsequent Event
Business Acquisition [Line Items]
Ownership interest in joint venture					45.00%
Number of years to purchase remaining shares					2 years
Total cost to acquire minority ownership					$1,700,000,000

Inventories_Inventory_Disclosu

Inventories - Inventory Disclosure (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials & field materials	$2,666	$2,539
Work in process	273	261
Finished goods	1,689	1,803
Inventories	$4,628	$4,603

Fixed_Assets_Property_Plant_an

Fixed Assets - Property, Plant and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Property, plant and equipment	$36,964	$35,164
Less accumulated depreciation	21,568	20,068
Fixed assets less accumulated depreciation	15,396	15,096	14,780
Land
Property Plant And Equipment [Line Items]
Property, plant and equipment	445	394
Building and Building Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment	3,733	3,534
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment	31,937	29,332
Seismic Vessels
Property Plant And Equipment [Line Items]
Property, plant and equipment	$849	$1,904

Fixed_Assets_Additional_Inform

Fixed Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Depreciation expense relating to fixed assets	$3.20	$3.10	$2.90
Building and Building Improvements \| Minimum
Property Plant And Equipment [Line Items]
Useful Life	25 years
Building and Building Improvements \| Maximum
Property Plant And Equipment [Line Items]
Useful Life	30 years
Machinery and Equipment \| Minimum
Property Plant And Equipment [Line Items]
Useful Life	5 years
Machinery and Equipment \| Maximum
Property Plant And Equipment [Line Items]
Useful Life	10 years
Seismic Vessels \| Minimum
Property Plant And Equipment [Line Items]
Useful Life	20 years
Seismic Vessels \| Maximum
Property Plant And Equipment [Line Items]
Useful Life	30 years

Multiclient_Seismic_Data_Multi

Multiclient Seismic Data - Multiclient Seismic Data Table (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill Abstract
Opening balance	$667	$518
Capitalized in year	321	394
Charged to expense	-195	-245
Ending balance	$793	$667

Goodwill_Changes_in_Carrying_A

Goodwill - Changes in Carrying Amount of Goodwill (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$14,706	$14,585
Acquisitions	837	343
Divestiture of business		-150
Other	-56	-72
Goodwill, Ending Balance	15,487	14,706
Operating Segments \| Reservoir Characterization
Goodwill [Line Items]
Goodwill, Beginning Balance	3,737	3,760
Acquisitions	15	4
Reallocation	83
Other	-23	-27
Goodwill, Ending Balance	3,812	3,737
Operating Segments \| Drilling
Goodwill [Line Items]
Goodwill, Beginning Balance	8,315	8,337
Acquisitions	271	3
Reallocation	-83
Other	-15	-25
Goodwill, Ending Balance	8,488	8,315
Operating Segments \| Production
Goodwill [Line Items]
Goodwill, Beginning Balance	2,654	2,488
Acquisitions	551	336
Divestiture of business		-150
Other	-18	-20
Goodwill, Ending Balance	$3,187	$2,654

Intangible_Assets_Schedule_of_

Intangible Assets - Schedule of Intangible Assets by Major Class (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Gross Book Value	$6,299	$6,305
Accumulated Amortization	1,645	1,596
Net Book Value	4,654	4,709
Technology/Technical Know-How
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,747	1,960
Accumulated Amortization	535	597
Net Book Value	1,212	1,363
Tradenames
Finite Lived Intangible Assets [Line Items]
Gross Book Value	1,641	1,647
Accumulated Amortization	319	257
Net Book Value	1,322	1,390
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross Book Value	2,531	2,263
Accumulated Amortization	523	407
Net Book Value	2,008	1,856
Other
Finite Lived Intangible Assets [Line Items]
Gross Book Value	380	435
Accumulated Amortization	268	335
Net Book Value	$112	$100

Intangible_Assets_Additional_I

Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$344	$330	$331
Estimated amortization charged to income, 2015	349
Estimated amortization charged to income, 2016	338
Estimated amortization charged to income, 2017	329
Estimated amortization charged to income, 2018	319
Estimated amortization charged to income, 2019	$307

Longterm_Debt_and_Debt_Facilit2

Long-term Debt and Debt Facility Agreements - Long-term Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt, carrying amount	$10,565	$10,393
Commercial Paper
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,538
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,597	1,596
3.65% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,495	1,495
2.75% Guaranteed Notes due 2015
Debt Instrument [Line Items]
Long-term debt, carrying amount		1,373
1.95% Senior Notes due 2016
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,100	1,099
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,100	1,099
1.25% Senior Notes due 2017
Debt Instrument [Line Items]
Long-term debt, carrying amount	1,000	999
2.40% Senior Notes due 2022
Debt Instrument [Line Items]
Long-term debt, carrying amount	999	999
1.50% Guaranteed Notes due 2019
Debt Instrument [Line Items]
Long-term debt, carrying amount	628	697
2.65% Senior Notes due 2016
Debt Instrument [Line Items]
Long-term debt, carrying amount	500	500
Other
Debt Instrument [Line Items]
Long-term debt, carrying amount	$608	$536

Longterm_Debt_and_Debt_Facilit3

Long-term Debt and Debt Facility Agreements - Long-term Debt (Parenthetical) (Detail) (EUR €)	12 Months Ended		3 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2013
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate	3.30%	3.30%		3.30%
Debt instrument maturity date	2021	2021
3.65% Senior Notes due 2023
Debt Instrument [Line Items]
Debt instrument interest rate	3.65%	3.65%		3.65%
Debt instrument maturity date	2023	2023
2.75% Guaranteed Notes due 2015
Debt Instrument [Line Items]
Debt instrument interest rate	2.75%	2.75%	2.75%	2.75%
Debt instrument maturity date	2015	2015	2015
Long-term debt, carrying amount			€ 1
Effective interest rate on euro denominated debt		2.56%		2.56%
1.95% Senior Notes due 2016
Debt Instrument [Line Items]
Debt instrument interest rate	1.95%	1.95%		1.95%
Debt instrument maturity date	2016	2016
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate	4.20%	4.20%		4.20%
Debt instrument maturity date	2021	2021
1.25% Senior Notes due 2017
Debt Instrument [Line Items]
Debt instrument interest rate	1.25%	1.25%		1.25%
Debt instrument maturity date	2017	2017
2.40% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	2.40%	2.40%		2.40%
Debt instrument maturity date	2022	2022
1.50% Guaranteed Notes due 2019
Debt Instrument [Line Items]
Debt instrument interest rate	1.50%	1.50%		1.50%
Debt instrument maturity date	2019	2019		2019
Guaranteed notes face amount		0.5		0.5
Long-term debt, carrying amount		0.5		0.5
Senior note floating interest rate	three-month LIBOR plus approximately 64 basis points.
1.50% Guaranteed Notes due 2019 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis points				0.64%
2.65% Senior Notes due 2016
Debt Instrument [Line Items]
Debt instrument interest rate	2.65%	2.65%		2.65%
Debt instrument maturity date	2016	2016
Effective interest rate on euro denominated debt	2.39%
Euro Medium Term Note Program
Debt Instrument [Line Items]
Guaranteed notes face amount	5

Longterm_Debt_and_Debt_Facilit4

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	1,244,000,000	1,819,000,000
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	10,700,000,000	10,400,000,000
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

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended				12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
	USD ($)	1.50% Guaranteed Notes due 2019	Cross currency swap	Fixed Rate Debt	Floating Rate Debt	Foreign exchange contracts	Foreign exchange contracts	London Interbank Offered Rate (LIBOR)
	Country	EUR (€)	EUR (€)	1.50% Guaranteed Notes due 2019	1.50% Guaranteed Notes due 2019	USD ($)	Debt	Floating Rate Debt
							Derivatives designated as hedges	1.50% Guaranteed Notes due 2019
							USD ($)
Derivative [Line Items]
Notional amount of interest rate swap			€ 500,000,000			$6,800,000,000	$2,500,000,000
Guaranteed notes face amount		500,000,000
Derivative swap interest rate				1.50%
Floating interest rate on securities					three-month LIBOR plus approximately 64 basis points
Basis point								0.64%
Fixed rate debt aggregate, after taking into account the effects of the interest rate swaps	9,000,000,000
Variable rate debt aggregate, after taking into account the effects of the interest rate swaps	4,300,000,000
Short-term investments and fixed income investments, held to maturity	4,800,000,000
Number of countries in which Schlumberger conducts business	85
Percentage of revenue denominated in domestic currency	81.00%
Recognized a cumulative net (loss) in Accumulated other comprehensive loss relating to revaluation of foreign currency forward contracts and foreign currency options designated as cash flow hedges	($96,000,000)

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Assets
Derivative Assets	$40	$163
Derivative Liabilities
Derivative Liabilities	255	17
Derivatives designated as hedges
Derivative Assets
Derivative Assets	35	149
Derivative Liabilities
Derivative Liabilities	227	15
Derivatives not designated as hedges
Derivative Assets
Derivative Assets	5	14
Foreign exchange contracts \| Derivatives designated as hedges \| Other current assets
Derivative Assets
Derivative Assets	3	98
Foreign exchange contracts \| Derivatives designated as hedges \| Other Assets
Derivative Assets
Derivative Assets	32	24
Foreign exchange contracts \| Derivatives designated as hedges \| Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	80	14
Foreign exchange contracts \| Derivatives designated as hedges \| Other Liabilities
Derivative Liabilities
Derivative Liabilities	105	1
Foreign exchange contracts \| Derivatives not designated as hedges \| Other current assets
Derivative Assets
Derivative Assets	5	10
Foreign exchange contracts \| Derivatives not designated as hedges \| Other Assets
Derivative Assets
Derivative Assets		4
Foreign exchange contracts \| Derivatives not designated as hedges \| Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	28	2
Cross currency swap \| Derivatives designated as hedges \| Other Assets
Derivative Assets
Derivative Assets		27
Cross currency swap \| Derivatives designated as hedges \| Other Liabilities
Derivative Liabilities
Derivative Liabilities	$42

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Effect of Derivative Instruments Designated as Fair Value Hedges and Not Designated as Hedges on Consolidated Statement of Income (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivatives not designated as hedges
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income	($95)	($2)	$6
Cash Flow Hedging \| Derivatives designated as hedges \| Cross currency swap \| Interest expense
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income	-82	15	1
Cash Flow Hedging \| Derivatives not designated as hedges \| Foreign exchange contracts \| Cost of revenue
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income	-95	-2	5
Cash Flow Hedging \| Derivatives not designated as hedges \| Commodity contracts \| Cost of revenue
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Income			$1

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Common stock, shares authorized	4,500,000,000
Common stock, par value	$0.01
Common stock, shares outstanding	1,275,312,404	1,307,330,369
Preferred stock, shares authorized	200,000,000
Preferred stock, par value	$0.01
Preferred stock, issued	0
Other comprehensive income (loss)	($1,652)	$1,334	($331)

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	($2,554)	($3,888)	($3,557)
Other comprehensive income (loss) before reclassifications	-2,152	1,261	-707
Amounts reclassified from accumulated other comprehensive loss	418	375	276
Income taxes	82	-302	100
Balance	-4,206	-2,554	-3,888
Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	-1,068	-917	-993
Other comprehensive income (loss) before reclassifications	-463	-151	76
Balance	-1,531	-1,068	-917
Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	29	30	-26
Other comprehensive income (loss) before reclassifications	-238	49	92
Amounts reclassified from accumulated other comprehensive loss	113	-50	-36
Balance	-96	29	30
Pension and Other Postretirement Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	-1,691	-3,142	-2,538
Other comprehensive income (loss) before reclassifications	-1,285	1,328	-1,016
Amounts reclassified from accumulated other comprehensive loss	305	425	312
Income taxes	82	-302	100
Balance	-2,589	-1,691	-3,142
Unrealized Gain on Marketable Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	176	141
Other comprehensive income (loss) before reclassifications	-166	35	141
Balance	$10	$176	$141

Stockbased_Compensation_Plans_1

Stock-based Compensation Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	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	459
Aggregate intrinsic value of stock options exercisable	306
Total intrinsic value of options exercised	314	176	142
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements	514
Expected to be recognized in 2015	238
Expected to be recognized in 2016	152
Expected to be recognized in 2017	73
Expected to be recognized in 2018	43
Expected to be recognized in 2019	8
Future Grants Shares	33,000,000
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	600,000
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%
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	0
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance shares to be granted	1,341,000	1,949,000	1,668,000
Performance shares outstanding	4,138,000	4,171,000	3,566,000	2,433,000
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%

Stockbased_Compensation_Plans_2

Stock-based Compensation Plans - Weighted-Average Assumptions (Detail) (Employee Stock Option, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	1.60%	1.70%	1.50%
Expected volatility	37.00%	38.00%	39.00%
Risk free interest rate	2.20%	1.20%	1.50%
Expected option life in years	7 years	7 years	6 years 10 months 24 days
Weighted-average fair value per share	$34.20	$23.93	$25.26

Stockbased_Compensation_Plans_3

Stock-based Compensation Plans - Options Outstanding and Option Exercisable (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Options Outstanding	38,583
Weighted-average remaining contractual life (in years)	6 years 2 months 12 days
Weighted- average exercise price	$76.10
Options Exercisable	18,542
Weighted-average exercise price	$69.77
Exercise prices range $32.45Â -Â $67.87
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$32.45
Exercise prices maximum range	$67.87
Options Outstanding	6,553
Weighted-average remaining contractual life (in years)	3 years 2 months 12 days
Weighted- average exercise price	$51.50
Options Exercisable	6,295
Weighted-average exercise price	$51.03
Exercise prices range $68.51Â -Â $70.93
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$68.51
Exercise prices maximum range	$70.93
Options Outstanding	8,346
Weighted-average remaining contractual life (in years)	6 years 10 months 24 days
Weighted- average exercise price	$69.82
Options Exercisable	3,648
Weighted-average exercise price	$69.02
Exercise prices range $72.11Â -Â $78.31
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$72.11
Exercise prices maximum range	$78.31
Options Outstanding	7,553
Weighted-average remaining contractual life (in years)	7 years 2 months 12 days
Weighted- average exercise price	$72.56
Options Exercisable	1,915
Weighted-average exercise price	$72.47
Exercise prices range $83.88Â -Â $84.93
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$83.88
Exercise prices maximum range	$84.93
Options Outstanding	8,045
Weighted-average remaining contractual life (in years)	5 years 2 months 12 days
Weighted- average exercise price	$84.17
Options Exercisable	5,118
Weighted-average exercise price	$84.34
Exercise prices range $88.61Â -Â $114.83
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise prices minimum range	$88.61
Exercise prices maximum range	$115
Options Outstanding	8,086
Weighted-average remaining contractual life (in years)	8 years 1 month 6 days
Weighted- average exercise price	$97.78
Options Exercisable	1,566
Weighted-average exercise price	$95.92

Stockbased_Compensation_Plans_4

Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance, shares	41,939	42,059	40,027
Granted, shares	6,105	6,570	8,664
Exercised, shares	-8,269	-5,168	-4,171
Forfeited, shares	-1,192	-1,522	-2,461
Ending balance, shares	38,583	41,939	42,059
Beginning balance, Weighted-average exercise price	$70.33	$67.77	$63.84
Granted, Weighted-average exercise price	$99.04	$72.16	$72.04
Exercised, Weighted-average exercise price	$64.19	$51.73	$39.07
Forfeited, Weighted-average exercise price	$73.56	$70.57	$67.50
Ending balance, Weighted-average exercise price	$76.10	$70.33	$67.77

Stockbased_Compensation_Plans_5

Stock-based Compensation Plans - Restricted Stock Transactions (Detail) (Restricted Stock, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested at beginning of year, Restricted Stock	4,171,000	3,566,000	2,433,000
Performance shares to be granted	1,341,000	1,949,000	1,668,000
Vested, Restricted Stock	-1,186,000	-958,000	-351,000
Forfeited, Restricted Stock	-188,000	-386,000	-184,000
Unvested at end of year, Restricted Stock	4,138,000	4,171,000	3,566,000
Unvested at beginning of year, Weighted Average Grant Date Fair Value	$76.01	$73.62	$72.25
Granted, Weighted Average Grant Date Fair Value	$96.08	$75.65	$71.09
Vested, Weighted Average Grant Date Fair Value	$81.59	$66.98	$52.26
Forfeited, Weighted Average Grant Date Fair Value	$78.68	$74.53	$73.38
Unvested at end of year, Weighted Average Grant Date Fair Value	$80.80	$76.01	$73.62

Stockbased_Compensation_Plans_6

Stock-based Compensation Plans - Discounted Stock Purchase Plan Assumptions and Resulting Weighted Average Fair Value (Detail) (DSPP, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
DSPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	1.60%	1.70%	1.60%
Expected volatility	19.00%	24.00%	41.00%
Risk free interest rate	0.10%	0.10%	0.20%
Weighted average fair value per share	$12.67	$9.91	$12.71

Stockbased_Compensation_Plans_7

Stock-based Compensation Plans - Stock-Based Compensation Expense Recognized in Income (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$329	$315	$335
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	177	165	203
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	114	110	82
DSPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$38	$40	$50

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
	Jurisdictions	Dec. 31, 2013	Dec. 31, 2012
Income Tax Examination [Line Items]
Minimum number of jurisdictions to Schlumberger operates	100
US statutory federal rate	35.00%	35.00%	35.00%
Charges and credits, Pretax	$1,773	($420)	$161
Deferred tax assets, valuation allowances relating to net operating losses in certain countries	190	238
Accrued interest and penalties	243	253	250
Recognized interest and penalties	19	30	21
Domestic Country
Income Tax Examination [Line Items]
Charges and credits, Pretax	289	53	52
Foreign Country
Income Tax Examination [Line Items]
Charges and credits, Pretax	$1,484	($473)	$109
Minimum
Income Tax Examination [Line Items]
US statutory federal rate	0.00%
Maximum
Income Tax Examination [Line Items]
US statutory federal rate	40.00%

Income_Taxes_Income_Tax_Disclo

Income Taxes - Income Tax Disclosure Table (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before income taxes and minority interest, Total	$1,990	$1,904	$1,980
Income (loss) from continuing operations before income taxes and minority interest, Total	5,649	6,787	4,979
Income (loss) from continuing operations before income taxes and minority interest, Total	$7,639	$8,691	$6,959

Income_Taxes_Components_of_Net

Income Taxes - Components of Net Deferred Tax Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Postretirement benefits	$327	$236
Intangible assets	-1,435	-1,502
Investments in non-US subsidiaries	-227	-282
Other, net	183	128
Net deferred tax assets	($1,152)	($1,420)

Income_Taxes_Components_of_Con

Income Taxes - Components of Consolidated Income Taxes (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
United States - Federal	$718	$682	$698
United States - State	51	60	53
Outside United States	1,380	1,211	1,025
Current Income Tax Expense (Benefit), Total	2,149	1,953	1,776
Deferred:
United States - Federal	-194	-109	-105
United States - State	-9	-4	-7
Outside United States	-12	34	22
Valuation allowance	-6	-26	14
Deferred income taxes	-221	-105	-76
Consolidated taxes on income	$1,928	$1,848	$1,700

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of US Statutory Federal Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
US statutory federal rate	35.00%	35.00%	35.00%
Non-US income taxed at different rates	-11.00%	-12.00%	-10.00%
Other	-2.00%		-1.00%
Effective income tax rate	25.00%	21.00%	24.00%
Charges And Credits
Disclosure Income Tax Reconciliation Of U S Statutory Federal Tax Rate Detail [Line Items]
Charges and credits (See Note 3)	3.00%	-2.00%

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of Liabilities Associated with Uncertain Tax Provisions (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at beginning of year	$1,452	$1,453	$1,353
Additions based on tax positions related to the current year	154	146	156
Additions for tax positions of prior years	96	109	98
Additions related to acquisitions	43
Impact of changes in exchange rates	-62	-47	12
Settlements with tax authorities	-27	-64	-17
Reductions for tax positions of prior years	-212	-109	-103
Reductions due to the lapse of the applicable statute of limitations	-42	-36	-46
Balance at end of year	$1,402	$1,452	$1,453

Income_Taxes_Tax_Years_Subject

Income Taxes - Tax Years Subject to Examination by Tax Authorities (Detail)	12 Months Ended
	Dec. 31, 2014
Brazil
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2009 - 2014
Canada
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2007 - 2014
Ecuador
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2001 - 2014
Mexico
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2007 - 2014
Norway
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2013 - 2014
Russia
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2011 - 2014
Saudi Arabia
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2001 - 2014
United Kingdom
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2009 - 2014
United States
Disclosure Income Tax Components Of Consolidated Income Taxes Detail [Line Items]
Income tax examination, year(s) under examination	2011 - 2014

Leases_and_Lease_Commitments_A

Leases and Lease Commitments - Additional Information (Detail) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Leases [Abstract]
Total rental expense	$2.10	$1.90	$1.90

Leases_and_Lease_Commitments_F

Leases and Lease Commitments - Future Minimum Rental Commitments Under Noncancelable Operating Leases (Detail) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified	Dec. 31, 2014
Leases [Abstract]
2015	$330
2016	259
2017	197
2018	156
2019	134
Thereafter	554
Total	$1,630

Contingencies_Additional_Infor

Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]
Charge recorded within loss from discontinued operations	$205	($205)	($69)	$260

Segment_Information_Schedule_o

Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$48,580		$45,266		$41,731
Income before taxes	7,639		8,691		6,959
Assets	66,904		67,100		61,547
Depreciation and amortization	4,094	[1]	3,879	[1]	3,647	[1]
Capital Expenditures	3,976		3,943		4,694
Discontinued Operations
Segment Reporting Information [Line Items]
Assets					246
Operating Segments
Segment Reporting Information [Line Items]
Revenue	48,580		45,266		41,731
Operating Segments \| Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue	12,224		12,463		11,360
Income before taxes	3,607		3,660		3,080
Assets	8,596		8,918		8,501
Depreciation and amortization	1,391		1,338		1,309
Capital Expenditures	1,152		1,275		1,235
Operating Segments \| Drilling
Segment Reporting Information [Line Items]
Revenue	18,462		17,099		15,691
Income before taxes	3,872		3,293		2,778
Assets	11,378		10,940		11,316
Depreciation and amortization	1,174		1,077		1,072
Capital Expenditures	1,328		1,291		1,668
Operating Segments \| Production
Segment Reporting Information [Line Items]
Revenue	18,111		15,927		14,802
Income before taxes	3,227		2,619		2,327
Assets	11,848		11,185		9,889
Depreciation and amortization	1,133		1,039		877
Capital Expenditures	1,246		1,204		1,439
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	-217		-223		-122
Income before taxes	-130		-228		-68
Assets	1,577		1,974		1,920
Depreciation and amortization	198		217		191
Capital Expenditures	250		173		352
Corporate
Segment Reporting Information [Line Items]
Income before taxes	-848	[2]	-726	[2]	-696	[2]
Assets	11,178	[2]	12,050	[2]	8,021	[2]
Depreciation and amortization	198	[2]	208	[2]	198	[2]
Goodwill and intangible assets
Segment Reporting Information [Line Items]
Assets	20,142		19,415		19,387
Other Assets
Segment Reporting Information [Line Items]
Assets	2,185		2,618		2,267
Pretax operating income
Segment Reporting Information [Line Items]
Income before taxes	10,576		9,344		8,117
Interest income
Segment Reporting Information [Line Items]
Income before taxes	31	[3]	22	[3]	30	[3]
Interest expense
Segment Reporting Information [Line Items]
Income before taxes	-347	[4]	-369	[4]	-331	[4]
Charges And Credits
Segment Reporting Information [Line Items]
Income before taxes	($1,773)	[5]	$420	[5]	($161)	[5]

[1]	Includes depreciation of property, plant and equipment and amortization of intangible assets, multiclient seismic data costs and SPM investments.
[2]	Comprised principally of certain corporate expenses not allocated to the segments, interest on postretirement medical benefits, stock-based compensation costs, amortization expense associated with certain intangible and other nonoperating items. Corporate assets consist of cash, short-term investments, fixed income investments, held to maturity and investments in affiliates.
[3]	Interest income excludes amounts which are included in the segmentsâ€™ income (2014: $20 million; 2013: $11 million; 2012: $- million).
[4]	Interest expense excludes amounts which are included in the segmentsâ€™ income (2014: $22 million; 2013: $22 million; 2012: $9 million).
[5]	See Note 3 â€“ Charges and Credits.

Segment_Information_Schedule_o1

Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Interest expense included in the segment results	$369	$391	$340
Interest Income Excluded From Segment Information
Segment Reporting Information [Line Items]
Interest income included in the segment results	20	11
Interest Expense Excluded From Segment Information
Segment Reporting Information [Line Items]
Interest expense included in the segment results	$22	$22	$9

Segment_Information_Revenue_by

Segment Information - Revenue by Geographic Area (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$48,580	$45,266	$41,731
Operating Segments
Segment Reporting Information [Line Items]
Revenue	48,580	45,266	41,731
Operating Segments \| North America
Segment Reporting Information [Line Items]
Revenue	16,151	13,897	13,535
Operating Segments \| Latin America
Segment Reporting Information [Line Items]
Revenue	7,699	7,754	7,554
Operating Segments \| Europe/CIS/Africa
Segment Reporting Information [Line Items]
Revenue	12,515	12,411	11,510
Operating Segments \| Middle East & Asia
Segment Reporting Information [Line Items]
Revenue	11,875	10,767	8,717
Eliminations & other
Segment Reporting Information [Line Items]
Revenue	$340	$437	$415

Segment_Information_Additional

Segment Information - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$48,580	$45,266	$41,731
United States
Segment Reporting Information [Line Items]
Revenue	$14,000	$12,000	$11,800
Sales Revenue, Segment
Segment Reporting Information [Line Items]
Maximum percentage of consolidated revenue customers	10.00%	10.00%	10.00%

Segment_Information_Fixed_Asse

Segment Information - Fixed Assets Less Accumulated Depreciation by Geographic Area (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Fixed Assets less accumulated depreciation	$15,396		$15,096		$14,780
Operating Segments \| North America
Segment Reporting Information [Line Items]
Fixed Assets	4,885		4,858		4,868
Operating Segments \| Latin America
Segment Reporting Information [Line Items]
Fixed Assets	1,969		1,889		1,788
Operating Segments \| Europe
Segment Reporting Information [Line Items]
Fixed Assets	3,640		3,452		3,414
Operating Segments \| Middle East & Asia
Segment Reporting Information [Line Items]
Fixed Assets	3,446		2,991		2,908
Unallocated
Segment Reporting Information [Line Items]
Fixed Assets	$1,456	[1]	$1,906	[1]	$1,802	[1]

[1]	Represents seismic vessels, including the related on-board equipment, which frequently transition between geographic areas.

Pension_and_Other_Benefit_Plan2

Pension and Other Benefit Plans - Weighted-Average Assumed Discount Rate, Compensation Increases and Expected Long-Term Rate of Return on Plan Assets Used to Determine Net Pension Cost for US and International Plans (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.15%	4.85%
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.85%	4.25%	5.50%
Compensation increases	4.00%	4.00%	4.00%
Return on plan assets	7.25%	7.50%	7.50%
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.76%	4.38%	4.95%
Compensation increases	4.80%	4.83%	4.91%
Return on plan assets	7.50%	7.50%	7.50%

Pension_and_Other_Benefit_Plan3

Pension and Other Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
US Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	$72	$80	$68
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	164	150	152
Expected return on plan assets	-208	-200	-185
Amortization of net loss	82	122	95
Amortization of prior service cost	12	12	12
Total pension cost	122	164	142
International
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	126	127	86
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	288	253	241
Expected return on plan assets	-450	-384	-328
Amortization of net loss	94	155	76
Amortization of prior service cost	120	117	120
Total pension cost	178	268	195
Postretirement medical plan
Defined Benefit Plan Disclosure [Line Items]
Service cost - benefits earned during the period	43	48	29
Interest cost on projected benefit obligation and on accumulated postretirement benefit obligation	60	56	58
Expected return on plan assets	-45	-37	-30
Amortization of net loss	1	23	16
Amortization of prior service cost	-4	-4	-7
Total pension cost	$55	$86	$66

Pension_and_Other_Benefit_Plan4

Pension and Other Benefit Plans - Weighted-Average Assumed Discount Rate and Compensation Increases Used to Determine Projected Benefit Obligations for US and International Plans (Detail)	Dec. 31, 2014	Dec. 31, 2013
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.15%	4.85%
Compensation increases	4.00%	4.00%
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.07%	4.76%
Compensation increases	4.79%	4.80%

Pension_and_Other_Benefit_Plan5

Pension and Other Benefit Plans - Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts Recognized in Balance Sheet
Postretirement Benefits	($1,501)	($670)
US Plan Assets
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	3,418	3,558
Service cost	72	80	68
Interest cost	164	150	152
Actuarial losses (gains)	627	-232
Benefits paid	-144	-138
Projected benefit obligation at end of year	4,137	3,418	3,558
Change in Plan Assets
Plan assets at fair value at beginning of year	3,269	2,910
Actual return on plan assets	339	356
Company contributions	85	141
Benefits paid	-144	-138
Plan assets at fair value at end of year	3,549	3,269	2,910
(Unfunded Liability) / Asset	-588	-149
Amounts Recognized in Balance Sheet
Postretirement Benefits	-588	-149
Total of post retirement benefits	-588	-149
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	1,104	687
Prior service cost	66	78
Total amount recognized in accumulated other comprehensive income	1,170	765
Accumulated benefit obligation	3,805	3,158
International
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	5,981	5,798
Service cost	126	127	86
Interest cost	288	253	241
Contributions by plan participants	122	104
Actuarial losses (gains)	1,000	-168
Currency effect	-90	30
Benefits paid	-178	-163
Projected benefit obligation at end of year	7,249	5,981	5,798
Change in Plan Assets
Plan assets at fair value at beginning of year	6,246	5,120
Actual return on plan assets	502	836
Currency effect	-102	35
Company contributions	240	314
Contributions by plan participants	122	104
Benefits paid	-178	-163
Plan assets at fair value at end of year	6,830	6,246	5,120
(Unfunded Liability) / Asset	-419	265
Amounts Recognized in Balance Sheet
Postretirement Benefits	-546	-5
Other Assets	127	270
Total of post retirement benefits	-419	265
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	1,658	882
Prior service cost	357	418
Total amount recognized in accumulated other comprehensive income	2,015	1,300
Accumulated benefit obligation	$6,793	$5,593

Pension_and_Other_Benefit_Plan6

Pension and Other Benefit Plans - Weighted-Average Allocation of Plan Assets and Target Allocation by Asset Category (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target allocation of assets	100.00%	100.00%
Target Allocation Percentage of Assets, Total	100.00%	100.00%
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target allocation of assets	100.00%	100.00%
Target Allocation Percentage of Assets, Total	100.00%	100.00%
Equity securities \| US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	37.00%
Target Allocation Percentage of Assets, Range Maximum	56.00%
Target allocation of assets	48.00%	50.00%
Equity securities \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	50.00%
Target Allocation Percentage of Assets, Range Maximum	71.00%
Target allocation of assets	58.00%	60.00%
Debt securities \| US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	35.00%
Target Allocation Percentage of Assets, Range Maximum	62.00%
Target allocation of assets	42.00%	40.00%
Debt securities \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	20.00%
Target Allocation Percentage of Assets, Range Maximum	35.00%
Target allocation of assets	32.00%	31.00%
Cash and cash equivalents \| US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	0.00%
Target Allocation Percentage of Assets, Range Maximum	3.00%
Target allocation of assets	2.00%	2.00%
Cash and cash equivalents \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	0.00%
Target Allocation Percentage of Assets, Range Maximum	5.00%
Target allocation of assets	4.00%	3.00%
Alternative investments \| US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	0.00%
Target Allocation Percentage of Assets, Range Maximum	8.00%
Target allocation of assets	8.00%	8.00%
Alternative investments \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Target Allocation Percentage of Assets, Range Minimum	0.00%
Target Allocation Percentage of Assets, Range Maximum	25.00%
Target allocation of assets	6.00%	6.00%

Pension_and_Other_Benefit_Plan7

Pension and Other Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Frequency of asset performance monitored, years	5 years
Anticipated contributions to postretirement benefit plans	$400
Expenses for deferred benefit programs	$749	$671	$620
US Employees Postretirement Benefits Other Than Pensions
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Retirement coverage plan, description	During the fourth quarter of 2014 Schlumberger announced that, effective April 1, 2015, it will change the way it provides healthcare coverage to certain retirees who are age 65 and over. Under the amended plan, these retirees will transfer to individual coverage under the Medicare Exchange. Schlumberger will subsidize the cost of the program by providing these retirees with a Health Reimbursement Account. The annual subsidy may be increased based on medical cost inflation, but it will not be increased more than 5% in any given year.
Percentage of accumulated benefit obligation	66.00%
US Employees Postretirement Benefits Other Than Pensions \| Maximum
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Compensation increases	5.00%
Postretirement medical plan \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Investment of assets in government and government-related debt securities under US postretirement medical plan	40.00%
Postretirement medical plan \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Investment of assets in government and government-related debt securities under US postretirement medical plan	60.00%

Pension_and_Other_Benefit_Plan8

Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	$3,549	$3,269	$2,910
US Plan Assets \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	59	77
US Plan Assets \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	552	572
US Plan Assets \| Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	654	548
US Plan Assets \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	735	639
US Plan Assets \| Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	107	99
US Plan Assets \| Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	210	204
US Plan Assets \| Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	83	62
US Plan Assets \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,149	1,068
US Plan Assets \| Level One
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,270	1,264
US Plan Assets \| Level One \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	40	24
US Plan Assets \| Level One \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	433	454
US Plan Assets \| Level One \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	175	161
US Plan Assets \| Level One \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	622	625
US Plan Assets \| Level Two
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,986	1,739
US Plan Assets \| Level Two \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	19	53
US Plan Assets \| Level Two \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	119	118
US Plan Assets \| Level Two \| Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	654	548
US Plan Assets \| Level Two \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	560	478
US Plan Assets \| Level Two \| Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	107	99
US Plan Assets \| Level Two \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	527	443
US Plan Assets \| Level Three
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	293	266
US Plan Assets \| Level Three \| Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	210	204
US Plan Assets \| Level Three \| Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	83	62
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	6,830	6,246	5,120
International \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	264	267
International \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,534	1,566
International \| Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	780	576
International \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,181	997
International \| Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	256	301
International \| Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	246	206
International \| Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	49	60
International \| Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	88	98
International \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	2,432	2,175
International \| Level One
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	2,986	2,726
International \| Level One \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	174	127
International \| Level One \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,047	990
International \| Level One \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	8	6
International \| Level One \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,757	1,603
International \| Level Two
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	3,461	3,156
International \| Level Two \| Cash and cash equivalents
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	90	140
International \| Level Two \| International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	487	576
International \| Level Two \| Corporate bonds
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	780	576
International \| Level Two \| Government and government-related debt securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	1,173	991
International \| Level Two \| Collateralized mortgage obligations and mortgage backed securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	256	301
International \| Level Two \| United States \| Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	675	572
International \| Level Three
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	383	364
International \| Level Three \| Private equity
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	246	206
International \| Level Three \| Real estate
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	49	60
International \| Level Three \| Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Plan assets at fair value	$88	$98

Pension_and_Other_Benefit_Plan9

Pension and Other Benefit Plans - Defined Benefit Plan Weighted Average Assumptions Used in Calculating Benefit Obligation and Net Periodic Benefit Cost For US Postretirement Medical Plan (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.15%	4.85%
Current medical cost trend rate	7.00%	7.25%
Ultimate medical cost trend rate	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2023	2023
Postretirement medical plan
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	4.85%	4.25%	5.00%
Return on plan assets	7.00%	7.00%	7.00%
Current medical cost trend rate	7.25%	7.50%	8.00%
Ultimate medical cost trend rate	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2023	2023	2018

Recovered_Sheet1

Pension and Other Benefit Plans - Changes in Accumulated Postretirement Benefit Obligation, Plan Assets and Funded Status (Detail) (Postretirement medical plan, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Postretirement medical plan
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	$1,247	$1,410
Service cost	43	48
Interest cost	60	56
Contributions by plan participants	6	6
Actuarial losses (gains)	210	-232
Benefits paid	-46	-41
Plan amendments	-299
Projected benefit obligation at end of year	1,221	1,247
Change in Plan Assets
Plan assets at fair value at beginning of year	731	576
Company contributions	65	83
Contributions by plan participants	6	6
Benefits paid	-46	-41
Actual return on plan assets	98	107
Plan assets at fair value at end of year	854	731
(Unfunded Liability) / Asset	-367	-516
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	242	87
Prior service cost	-307	-12
Total amount recognized in accumulated other comprehensive income	($65)	$75

Recovered_Sheet2

Pension and Other Benefit Plans - Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail) (Postretirement medical plan, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Postretirement medical plan
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Effect on total service and interest cost components, One percentage point increase	$42
Effect on accumulated postretirement benefit obligation, One percentage point increase	37
Effect on total service and interest cost components, One percentage point decrease	-17
Effect on accumulated postretirement benefit obligation, One percentage point decrease	($33)

Recovered_Sheet3

Pension and Other Benefit Plans - Expected Benefits to be Paid Under US and International Pension Plans and Postretirement Medical Plan (Detail) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified	Dec. 31, 2014
US Plan Assets
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2015	$155
2016	162
2017	171
2018	181
2019	190
2020 - 2024	1,112
International
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2015	222
2016	240
2017	256
2018	274
2019	290
2020 - 2024	1,675
Postretirement medical plan
Pension Plans Postretirement And Other Employee Benefits [Line Items]
2015	46
2016	49
2017	52
2018	56
2019	59
2020 - 2024	$344

Recovered_Sheet4

Pension and Other Benefit Plans - Defined Benefit Plan, Amounts That Will be Amortized from Accumulated Other Comprehensive Income (loss) in Next Fiscal Year (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Pension Plans
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Net actuarial losses	$274
Prior service cost (credit)	133
Postretirement medical plan
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Net actuarial losses	17
Prior service cost (credit)	($32)

Supplementary_Information_Cash

Supplementary Information - Cash Paid for Interest and Income Taxes (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Interest	$389	$369	$313
Income taxes	$2,048	$1,729	$1,736

Supplementary_Information_Inte

Supplementary Information - Interest and Other Income, Net (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Interest income	$51	$33	$30
Earnings of equity method investments	240	132	142
Interest and other income, net	$291	$165	$172

Supplementary_Information_Chan

Supplementary Information - Change in Allowance for Doubtful Accounts (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting [Abstract]
Balance at beginning of year	$384	$202	$177
Provision	39	205	37
Amounts written off	-148	-23	-10
Divestiture of business			-2
Balance at end of year	$275	$384	$202

Supplementary_Information_Acco

Supplementary Information - Accounts Payable and Accrued Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting [Abstract]
Payroll, vacation and employee benefits	$1,899	$1,910
Trade	4,344	4,155
Other	3,003	2,772
Accounts payable and accrued liabilities	$9,246	$8,837

Discontinued_Operations_Additi

Discontinued Operations - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2012	Jun. 30, 2012
Disclosure - Discontinued Operations - Additional Information (Detail) [Line Items]
Proceed from sale of business		$2
Gain on divestiture, net of tax		28
Percentage of Schlumberger completed the sale of interest in CE Franklin Ltd. to NOV	56.00%
Wilson Distribution Segment
Disclosure - Discontinued Operations - Additional Information (Detail) [Line Items]
Proceed from sale of business			906
Pre tax gain			137
Gain on divestiture, net of tax			16
CE Franklin Ltd.
Disclosure - Discontinued Operations - Additional Information (Detail) [Line Items]
Proceed from sale of business	122
Pre tax gain	30
Gain on divestiture, net of tax	12

Discontinued_Operations_Discon

Discontinued Operations - Discontinued Operations (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations And Disposal Groups [Abstract]
Revenue			$102	$1,399
(Loss) income before taxes		-205	-63	274
Tax expense			-6	-37
Net income attributable to noncontrolling interests				-5
Gain on divestiture, net of tax				28
Income (loss) from discontinued operations	$205	($205)	($69)	$260