Pension and Other Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

Compensation And Retirement Disclosure [Abstract]

Fair Value of Schlumberger's Pension Plan Assets

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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	%		5.50	%		4.76	%		4.38	%		4.95	%
Compensation increases		4.00	%		4.00	%		4.00	%		4.80	%		4.83	%		4.91	%
Return on plan assets		7.25	%		7.50	%		7.50	%		7.50	%		7.50	%		7.50	%

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		4.00	%		4.00	%		4.79	%		4.80	%

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 Cost for the year
	2014			2013			2014			2013			2012
Discount rate		4.15	%		4.85	%		4.85	%		4.25	%		5.00	%
Return on plan assets		—			—			7.00	%		7.00	%		7.00	%
Current medical cost trend rate		7.00	%		7.25	%		7.25	%		7.50	%		8.00	%
Ultimate medical cost trend rate		5.00	%		5.00	%		5.00	%		5.00	%		5.00	%
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 point increase		One percentage 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 Medical Plan
	US		International
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 Plans		Postretirement Medical Plan
Net actuarial losses	$	274	$	17
Prior service cost (credit)	$	133	$	(32	)