Supplementary Information - Additional Information (Detail) - USD ($) $ in Billions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting [Abstract]
Revenue in excess of billings	$ 0.2	$ 0.2

Contract with customer liability revenue in excess of billings.

No definition available.

Name:	slb_ContractWithCustomerLiabilityRevenueInExcessOfBillings
Namespace Prefix:	slb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant