Multiclient Seismic Data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012
Multiclient Seismic Data
Balance at December 31, 2011	$ 425
Capitalized in period	101
Charged to expense	(72)
Balance at March 31, 2012	$ 454

Capitalized costs directly incurred in acquiring and processing of seismic surveys that are licensed on a nonexclusive basis, net of amortization.

No definition available.

Name:	slb_MulticlientSeismicData
Namespace Prefix:	slb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant