Pension and Other Postretirement Benefits (Table)

9 Months Ended

Sep. 30, 2011

Defined Benefit Plan Disclosure [Line Items]

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

	(Stated in millions)
	Third Quarter												Nine Months
	2011						2010						2011						2010
	US			Int’l			US			Int’l			US			Int’l			US			Int’l
Service cost — benefits earned during period	$	14		$	15		$	15		$	15		$	44		$	49		$	43		$	39
Interest cost on projected benefit obligation		37			56			35			53			112			169			106			156
Expected return on plan assets		(42	)		(69	)		(48	)		(59	)		(127	)		(210	)		(143	)		(174	)
Amortization of prior service cost		3			30			1			28			9			91			3			85
Amortization of net loss		23			7			14			5			67			23			45			15
	$	35		$	39		$	17		$	42		$	105		$	122		$	54		$	121

	(Stated in millions)
	Third Quarter						Nine Months
	2011			2010			2011			2010
Service cost — benefits earned during period	$	6		$	6		$	18		$	17
Interest cost on accumulated postretirement benefit obligation		14			14			43			43
Expected return on plan assets		(5	)		(1	)		(15	)		(4	)
Amortization of prior service cost		(3	)		(5	)		(9	)		(15	)
Amortization of net loss		4			2			10			8
	$	16		$	16		$	47		$	49