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Long-term Debt and Debt Facility Agreements - Additional Information (Detail) $ in Millions, € in Billions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 EUR (€) | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |
Committed credit facility agreement aggregated | $ 6,500 | $ 6,500 |  |  |
Unused credit facility | 4,100 | 4,100 |  |  |
Short-term borrowings and current portion of long-term debt | 1,407 | 1,407 | $ 3,324 |  |
Long-term debt, carrying amount | $ 14,644 | $ 14,644 | 14,875 |  |
Debt instrument interest rate |  |  |  |  | 6.50%
Weighted average interest rate on variable rate debt | 3.50% | 3.50% |  | 3.50% |
Long-term Debt maturity in 2020 | $ 2,100 | $ 2,100 |  |  |
Long-term Debt maturity in 2021 | 3,100 | 3,100 |  |  |
Long-term Debt maturity in 2022 | 4,400 | 4,400 |  |  |
Long-term Debt maturity in 2023 | 2,100 | 2,100 |  |  |
Long-term Debt maturity in 2025 | 1,800 | 1,800 |  |  |
Long-term Debt maturity in 2026 | 700 | 700 |  |  |
Long-term Debt maturity thereafter | 400 | 400 |  |  |
Long-term debt, fair value | 14,600 | 14,600 | $ 15,200 |  |
1.00% Guaranteed Notes due 2026 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, carrying amount | $ 678 | $ 678 |  |  |
Guaranteed notes face amount | € |  |  |  | € 600 |
Debt instrument interest rate | 1.00% | 1.00% | 1.00% | 1.00% |
Debt instrument maturity date | 2026 | 2026 | 2026 |  |
Commercial paper programs mature in February 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Committed credit facility agreement aggregated | $ 1,000 | $ 1,000 |  |  |
Commercial paper programs mature in November 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Committed credit facility agreement aggregated | 1,500 | 1,500 |  |  |
Commercial paper programs mature in February 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Committed credit facility agreement aggregated | 2,000 | 2,000 |  |  |
Commercial paper programs mature in February 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Committed credit facility agreement aggregated | 2,000 | 2,000 |  |  |
Commercial paper borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term borrowings and current portion of long-term debt |  |  | $ 1,300 |  |
Long-term debt, carrying amount | 2,433 | 2,433 | 1,694 |  |
Long-term debt | $ 2,400 | $ 2,400 | 3,000 |  |
Long-term debt, fair value |  |  | $ 135 |  |
Schlumberger Investment SA |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Investment in subsidiary |  | 100.00% |  |  |

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