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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 |  |  |  |

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