Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Compensation And Retirement Disclosure [Abstract]

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

Net pension cost for the Schlumberger pension plans included the following components:

													(Stated in millions)
	Second Quarter												Six Months
	2013						2012						2013						2012
	US			Int’l			US			Int’l			US			Int’l			US			Int’l
Service cost—benefits earned during period	$	21		$	34		$	17		$	21		$	41		$	67		$	34		$	42
Interest cost on projected benefit obligation		38			63			38			58			75			124			76			116
Expected return on plan assets		(51	)		(100	)		(47	)		(80	)		(103	)		(200	)		(93	)		(160	)
Amortization of prior service cost		3			29			3			30			6			59			6			60
Amortization of net loss		31			37			23			15			63			74			46			30
	$	42		$	63		$	34		$	44		$	82		$	124		$	69		$	88

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

	(Stated in millions)
	Second Quarter						Six Months
	2013			2012			2013			2012
Service cost—benefits earned during period	$	12		$	7		$	24		$	14
Interest cost on accumulated postretirement benefit obligation		15			15			30			30
Expected return on plan assets		(9	)		(7	)		(18	)		(14	)
Amortization of prior service cost		(1	)		(2	)		(2	)		(4	)
Amortization of net loss		8			5			15			10
	$	25		$	18		$	49		$	36