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Face (par) amount of debt instrument at time of issuance.

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The number of countries in which the entity operates as of balance sheet date.

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Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($) Country	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Sep. 30, 2019 EUR (€)
Derivative [Line Items]
Number of countries in which Schlumberger generates revenue \| Country	120
Percentage of revenue denominated in domestic currency	73.00%
Denominated debt issued				$ 500,000,000	€ 2,000,000,000.0	€ 800,000,000	€ 1,500,000,000
Transaction gains (losses) of hedging activities	$ 21,000,000	$ 2,000,000	$ 1,000,000
Fair value of outstanding derivatives	$ 0	$ 0
0.00% Notes due 2024
Derivative [Line Items]
Notes, face amount \| €							€ 500,000,000	€ 500,000,000
Derivative swap interest rate		0.00%					0.00%
Promissory note interest rate	0.00%	0.00%					0.00%	0.00%
0.25% Notes due 2027
Derivative [Line Items]
Notes, face amount				$ 500,000,000		€ 400,000,000	€ 500,000,000	€ 500,000,000
Derivative swap interest rate		0.25%		1.40%		0.25%	0.25%
Promissory note interest rate	0.25%	0.25%				0.25%	0.25%	0.25%
0.50% Notes due 2031
Derivative [Line Items]
Notes, face amount \| €						€ 400,000,000	€ 500,000,000	€ 500,000,000
Derivative swap interest rate		0.50%				0.50%	0.50%
Promissory note interest rate	0.50%	0.50%				0.50%	0.50%	0.50%
1.40% Senior Notes due 2025
Derivative [Line Items]
Notes, face amount				$ 500,000,000
Promissory note interest rate	1.40%	1.40%		1.40%			1.40%
1.375% Notes due 2026
Derivative [Line Items]
Notes, face amount \| €					€ 1,000,000,000.0
Derivative swap interest rate					1.375%
Promissory note interest rate	1.375%	1.375%			1.375%		1.375%
2.00% Notes due 2032
Derivative [Line Items]
Notes, face amount \| €					€ 1,000,000,000.0
Derivative swap interest rate					2.00%
Cross currency swaps
Derivative [Line Items]
Notional amount of interest rate swap				$ 500,000,000	€ 2,000,000,000.0	€ 800,000,000	€ 1,500,000,000
Cross currency swaps \| 0.00% Notes due 2024
Derivative [Line Items]
Promissory note interest rate		2.29%					2.29%
Cross currency swaps \| 0.25% Notes due 2027
Derivative [Line Items]
Promissory note interest rate		2.51%				1.87%	2.51%
Cross currency swaps \| 0.50% Notes due 2031
Derivative [Line Items]
Promissory note interest rate		2.76%				2.20%	2.76%
Cross currency swaps \| 1.40% Senior Notes due 2025
Derivative [Line Items]
Promissory note interest rate				1.73%
Cross currency swaps \| 1.375% Notes due 2026
Derivative [Line Items]
Promissory note interest rate					2.77%
Cross currency swaps \| 2.00% Notes due 2032
Derivative [Line Items]
Promissory note interest rate					3.49%
Cross currency swaps \| Other Assets
Derivative [Line Items]
Derivative assets	$ 427,000,000	$ 41,000,000
Cross currency swaps \| Other Liabilities
Derivative [Line Items]
Derivative liability	13,000,000	$ 38,000,000
Foreign exchange contracts
Derivative [Line Items]
Notional amount of interest rate swap	8,600,000,000
Foreign exchange contracts \| Debt \| Derivatives designated as hedges
Derivative [Line Items]
Notional amount of interest rate swap	$ 6,400,000,000