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Derivative Instruments and Hedging Activities - Additional Information (Detail) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) Country | Jun. 30, 2020 EUR (€) Country | Mar. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |
Fixed rate debt aggregate | $ 15,500,000,000 |  |  |  |
Variable rate debt aggregate | $ 1,900,000,000 |  |  |  |
Number of countries in which Schlumberger generates revenue | Country | 120 | 120 |  |  |
Denominated debt issued |  | € 2,000,000,000.0 | € 800,000,000 | € 1,500,000,000 | $ 1,100,000,000
Recognized a cumulative loss in accumulated other comprehensive loss relating to changes in the fair value of foreign currency forward contracts and cross-currency swaps | $ 260,000,000 |  |  |  |
2.20% Senior Notes due 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount |  |  |  |  | $ 500,000,000
Derivative swap interest rate |  |  |  |  | 2.20%
2.65% Senior Notes due 2022 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount |  |  |  |  | $ 600,000,000
Derivative swap interest rate |  |  |  |  | 2.65%
Promissory note interest rate | 2.65% | 2.65% |  | 2.65% |
0.00% Notes due 2024 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount | € |  |  |  | € 500,000,000 |
Derivative swap interest rate |  |  |  | 0.00% |
Promissory note interest rate | 0.00% | 0.00% |  | 0.00% |
0.25% Notes due 2027 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount | € |  | € 1,000,000,000.0 | € 400,000,000 | € 500,000,000 |
Derivative swap interest rate | 1.375% | 1.375% | 0.25% | 0.25% |
Promissory note interest rate | 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 |
Derivative swap interest rate |  |  | 0.50% | 0.50% |
Promissory note interest rate | 0.50% | 0.50% | 0.50% | 0.50% |
0.50% Notes due 2031 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount | € |  |  | € 400,000,000 |  |
Derivative swap interest rate |  |  | 0.50% |  |
1.375% Notes due 2026 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount | € |  | € 1,000,000,000.0 |  |  |
Derivative swap interest rate | 1.375% | 1.375% |  |  |
Promissory note interest rate | 1.375% | 1.375% |  | 1.375% |
2.00% Notes due 2032 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notes, face amount | € |  | € 600,000,000 |  |  |
Derivative swap interest rate | 2.00% | 2.00% |  |  |
Cross currency swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of interest rate swap |  | € 1,600,000,000 | € 800,000,000 | € 1,500,000,000 | $ 1,100,000,000
Cross currency swaps | 2.20% Senior Notes due 2020 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate |  |  |  |  | 1.97%
Cross currency swaps | 2.65% Senior Notes due 2022 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate |  |  |  |  | 2.52%
Cross currency swaps | 0.00% Notes due 2024 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate |  |  |  | 2.29% |
Cross currency swaps | 0.25% Notes due 2027 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate |  |  | 1.87% | 2.51% |
Cross currency swaps | 0.50% Notes due 2031 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate |  |  | 2.20% | 2.76% |
Cross currency swaps | 1.375% Notes due 2026 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate | 2.77% | 2.77% |  |  |
Cross currency swaps | 2.00% Notes due 2032 |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Promissory note interest rate | 3.45% | 3.45% |  |  |
Foreign exchange contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of interest rate swap | $ 9,800,000,000 |  |  |  |
Foreign exchange contracts | Debt | Derivatives designated as hedges |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of interest rate swap | $ 6,000,000,000.0 |  |  |  |

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