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Weighted average interest rate on variable rate debt.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

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The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

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Long-term Debt and Debt Facility Agreements - Additional Information (Detail) € in Millions, $ in Millions	3 Months Ended							12 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	Jun. 30, 2020 EUR (€)	Dec. 31, 2019 EUR (€)	Sep. 30, 2019 EUR (€)
Debt Instrument [Line Items]
Debt instrument premium paid on repurchase		$ 40		$ 28	$ 29
Long-term debt, carrying amount				14,770				$ 16,036	$ 14,770		€ 5,000
Debt instrument premium paid						$ 48
Committed credit facility agreement aggregated								6,250
Unused credit facility								$ 5,860
Weighted average interest rate on variable rate debt								1.00%		1.00%
Long-term Debt maturity in 2022								$ 1,900
Long-term Debt maturity in 2023								1,900
Long-term Debt maturity in 2024								1,400
Long-term Debt maturity in 2025								1,500
Long-term Debt maturity in 2026								2,000
Long-term Debt maturity in 2027								1,100
Long-term Debt maturity thereafter								6,300
Long-term debt, fair value				15,300				$ 17,300	15,300
Schlumberger Investment SA
Debt Instrument [Line Items]
Investment in subsidiary								100.00%
Commercial paper programs mature in February 2023
Debt Instrument [Line Items]
Committed credit facility agreement aggregated								$ 2,750
Commercial paper programs mature in July 2025
Debt Instrument [Line Items]
Committed credit facility agreement aggregated								1,500
Commercial paper programs mature in February 2024
Debt Instrument [Line Items]
Committed credit facility agreement aggregated								2,000
Commercial paper programs mature in June 2021 \| Revolving Credit Facility
Debt Instrument [Line Items]
Committed credit facility agreement aggregated \| €										€ 1,540
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt, carrying amount				2,222				393	2,222
Long-term debt				$ 2,200				$ 400	$ 2,200
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Notes, face amount					$ 783
Debt instrument interest rate				3.00%	3.00%	3.00%			3.00%			3.00%	3.00%
Debt instrument maturity date				2020	2020	2020
Debt instrument, repurchase amount				$ 416					$ 416
Debt instrument, amount exchanged						$ 401
4.5% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate				4.50%					4.50%			4.50%
Debt instrument maturity date				2021
Debt instrument, repurchase amount				$ 126					$ 126
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate		4.20%		4.20%				4.20%	4.20%	4.20%	4.20%	4.20%
Debt instrument maturity date		2021		2021				2021	2021
Debt instrument, repurchase amount		$ 600		$ 500					$ 500
Long-term debt, carrying amount				$ 600					$ 600
0.25% Notes due 2027
Debt Instrument [Line Items]
Notes, face amount	$ 500		€ 400									€ 500	€ 500
Debt instrument interest rate			0.25%	0.25%	0.25%			0.25%	0.25%	0.25%		0.25%	0.25%
Debt instrument maturity date			2027		2027			2027	2027
Long-term debt, carrying amount				$ 550				$ 1,100	$ 550
3.60% Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate				3.60%					3.60%			3.60%
Debt instrument maturity date				2022
Debt instrument, repurchase amount				$ 106					$ 106
0.50% Notes due 2031
Debt Instrument [Line Items]
Notes, face amount \| €			€ 400									€ 500	€ 500
Debt instrument interest rate			0.50%	0.50%	0.50%			0.50%	0.50%	0.50%		0.50%	0.50%
Debt instrument maturity date			2031		2031			2031	2031
Long-term debt, carrying amount				$ 544				$ 1,099	$ 544
1.375% Notes due 2026
Debt Instrument [Line Items]
Notes, face amount \| €											€ 1,000
Debt instrument interest rate		1.375%		1.375%				1.375%	1.375%	1.375%	1.375%	1.375%
Debt instrument maturity date		2026						2026	2026
Long-term debt, carrying amount								$ 1,221
2.65% Senior Notes due 2030
Debt Instrument [Line Items]
Notes, face amount		$ 900
Debt instrument interest rate		2.65%		2.65%				2.65%	2.65%	2.65%	2.65%	2.65%
Debt instrument maturity date		2030						2030	2030
Long-term debt, carrying amount								$ 1,250
2.0% Notes due 2032
Debt Instrument [Line Items]
Notes, face amount \| €											€ 1,000
Debt instrument interest rate		2.00%		2.00%				2.00%	2.00%	2.00%	2.00%	2.00%
Debt instrument maturity date		2032						2032	2032
Long-term debt, carrying amount								$ 1,214
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate		3.30%		3.30%				3.30%	3.30%	3.30%	3.30%	3.30%
Debt instrument maturity date		2021						2021	2021
Debt instrument, repurchase amount		$ 935
Long-term debt, carrying amount				$ 1,597					$ 1,597
1.40% Senior Notes due 2025
Debt Instrument [Line Items]
Notes, face amount	$ 500
Debt instrument interest rate	1.40%			1.40%				1.40%	1.40%	1.40%		1.40%
Debt instrument maturity date	2025							2025	2025
Long-term debt, carrying amount								$ 498
2.65% Senior Notes due 2030
Debt Instrument [Line Items]
Notes, face amount	$ 350
Debt instrument interest rate	2.65%
Debt instrument maturity date	2030
0.00% Notes due 2024
Debt Instrument [Line Items]
Notes, face amount \| €												€ 500	€ 500
Debt instrument interest rate				0.00%	0.00%			0.00%	0.00%	0.00%		0.00%	0.00%
Debt instrument maturity date					2024			2024	2024
Long-term debt, carrying amount				$ 551				$ 611	$ 551
3.625% Senior Notes due 2022
Debt Instrument [Line Items]
Notes, face amount					$ 321
Debt instrument interest rate					3.625%								3.625%
Debt instrument maturity date					2022
3.90% Senior Notes due 2028
Debt Instrument [Line Items]
Notes, face amount						$ 1,500
Debt instrument interest rate				3.90%		3.90%		3.90%	3.90%	3.90%		3.90%
Debt instrument maturity date						2028		2028	2028
Long-term debt, carrying amount				$ 1,444				$ 1,450	$ 1,444
3.63% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate				3.63%		3.63%		3.63%	3.63%	3.63%		3.63%
Debt instrument maturity date						2022		2022	2022
Long-term debt, carrying amount				$ 294				$ 295	$ 294
Debt instrument, amount exchanged						$ 234
4.00% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate						4.00%
Debt instrument maturity date						2025
Debt instrument, amount exchanged						$ 817
3.75% Senior Notes due 2024
Debt Instrument [Line Items]
Notes, face amount							$ 750
Debt instrument interest rate				3.75%			3.75%	3.75%	3.75%	3.75%		3.75%
Debt instrument maturity date							2024	2024	2024
Long-term debt, carrying amount				$ 746				$ 746	$ 746
4.30% Senior Notes due 2029
Debt Instrument [Line Items]
Notes, face amount							$ 850
Debt instrument interest rate				4.30%			4.30%	4.30%	4.30%	4.30%		4.30%
Debt instrument maturity date							2029	2029	2029
Long-term debt, carrying amount				$ 845				$ 846	$ 845