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Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | $ 4,776 | $ 4,236 | $ 3,748
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 10,493 | 9,363 | $ 7,872
Level One | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 930 | 948 |
Level One | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 4,436 | 4,241 |
Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 3,547 | 3,014 |
Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 4,316 | 3,683 |
Level Three | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 299 | 274 |
Level Three | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 1,741 | 1,439 |
Cash and cash equivalents | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 140 | 73 |
Cash and cash equivalents | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 457 | 351 |
Cash and cash equivalents | Level One | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 127 | 59 |
Cash and cash equivalents | Level One | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 215 | 166 |
Cash and cash equivalents | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 13 | 14 |
Cash and cash equivalents | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 242 | 185 |
Equity securities, US | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 527 | 605 |
Equity securities, US | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 2,797 | 2,834 |
Equity securities, US | Level One | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 441 | 500 |
Equity securities, US | Level One | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 2,393 | 2,347 |
Equity securities, US | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 86 | 105 |
Equity securities, US | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [1] | 404 | 487 |
Equity securities, International | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 186 | 320 |
Equity securities, International | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 1,711 | 1,871 |
Equity securities, International | Level One | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 182 | 315 |
Equity securities, International | Level One | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 1,615 | 1,723 |
Equity securities, International | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 4 | 5 |
Equity securities, International | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [2] | 96 | 148 |
Corporate bonds | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [3] | 1,945 | 1,687 |
Corporate bonds | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [3] | 1,260 | 1,105 |
Corporate bonds | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [3] | 1,945 | 1,687 |
Corporate bonds | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [3] | 1,260 | 1,105 |
Government and government-related debt securities | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 1,658 | 1,256 |
Government and government-related debt securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 2,405 | 1,602 |
Government and government-related debt securities | Level One | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 180 | 74 |
Government and government-related debt securities | Level One | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 213 | 5 |
Government and government-related debt securities | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 1,478 | 1,182 |
Government and government-related debt securities | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [4] | 2,192 | 1,597 |
Collateralized mortgage obligations and mortgage backed securities | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [5] | 21 | 21 |
Collateralized mortgage obligations and mortgage backed securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [5] | 122 | 161 |
Collateralized mortgage obligations and mortgage backed securities | Level Two | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [5] | 21 | 21 |
Collateralized mortgage obligations and mortgage backed securities | Level Two | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [5] | 122 | 161 |
Private equity | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [6] | 204 | 181 |
Private equity | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [6] | 851 | 623 |
Private equity | Level Three | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [6] | 204 | 181 |
Private equity | Level Three | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [6] | 851 | 623 |
Real estate | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [7] | 95 | 93 |
Real estate | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [7] | 200 | 183 |
Real estate | Level Three | US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [7] | 95 | 93 |
Real estate | Level Three | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value | [7] | 200 | 183 |
Other | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | 690 | 633 |
Other | Level Three | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets at fair value |  | $ 690 | $ 633 |
[1] | US equities include companies that are well-diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.
[2] | International equities are invested in companies that are traded on exchanges outside the US and are well-diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets, with a small percentage in emerging markets.
[3] | Corporate bonds consist primarily of investment grade bonds from diversified industries.
[4] | Government and government-related debt securities are comprised primarily of inflation-protected US treasuries and, to a lesser extent, other government-related securities.
[5] | Collateralized mortgage obligations and mortgage backed-securities are debt obligations that represent claims to the cash flows from pools of mortgage loans, which are purchased from banks, mortgage companies, and other originators and then assembled into pools by governmental, quasi-governmental and private entities.
[6] | Private equity includes investments in several funds of funds.
[7] | Real estate primarily includes investments in real estate limited partnerships, concentrated in commercial real estate.

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