Pension and Other Postretirement Benefit (Tables)

3 Months Ended

Mar. 31, 2012

Pension Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Pension Cost for the Schlumberger Pension Plans and US Postretirement Medical Plan

				(Stated in millions)
	First Quarter
	2012						2011
	US			Int’l			US			Int’l
Service cost - benefits earned during period	$	17		$	21		$	16		$	17
Interest cost on projected benefit obligation		38			58			38			56
Expected return on plan assets		(46	)		(80	)		(43	)		(70	)
Amortization of prior service cost		3			30			3			31
Amortization of net loss		23			15			22			8
	$	35		$	44		$	36		$	42

Postretirement Medical Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Pension Cost for the Schlumberger Pension Plans and US Postretirement Medical Plan

	(Stated in millions)
	First Quarter
	2012			2011
Service cost - benefits earned during period	$	7		$	7
Interest cost on accumulated postretirement benefit obligation		15			14
Expected return on plan assets		(7	)		(5	)
Amortization of prior service cost		(2	)		(3	)
Amortization of net loss		5			3
	$	18		$	16