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Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 4,236 $ 3,748 $ 4,058
International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 9,363 7,872 $ 8,507
Level One | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 948 789  
Level One | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 4,241 3,514  
Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,014 2,688  
Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 3,683 3,126  
Level Three | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 274 271  
Level Three | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 1,439 1,232  
Cash and cash equivalents | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 73 80  
Cash and cash equivalents | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 351 157  
Cash and cash equivalents | Level One | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 59 44  
Cash and cash equivalents | Level One | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 166 75  
Cash and cash equivalents | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 14 36  
Cash and cash equivalents | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 185 82  
Equity securities, US | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 605 501  
Equity securities, US | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 2,834 2,421  
Equity securities, US | Level One | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 500 416  
Equity securities, US | Level One | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 2,347 2,028  
Equity securities, US | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 105 85  
Equity securities, US | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [1] 487 393  
Equity securities, International | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 320 267  
Equity securities, International | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 1,871 1,526  
Equity securities, International | Level One | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 315 263  
Equity securities, International | Level One | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 1,723 1,406  
Equity securities, International | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 5 4  
Equity securities, International | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [2] 148 120  
Corporate bonds | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [3] 1,687 1,517  
Corporate bonds | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [3] 1,105 923  
Corporate bonds | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [3] 1,687 1,517  
Corporate bonds | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [3] 1,105 923  
Government and government-related debt securities | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 1,256 1,072  
Government and government-related debt securities | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 1,602 1,377  
Government and government-related debt securities | Level One | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 74 66  
Government and government-related debt securities | Level One | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 5 5  
Government and government-related debt securities | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 1,182 1,006  
Government and government-related debt securities | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [4] 1,597 1,372  
Collateralized mortgage obligations and mortgage backed securities | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [5] 21 40  
Collateralized mortgage obligations and mortgage backed securities | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [5] 161 236  
Collateralized mortgage obligations and mortgage backed securities | Level Two | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [5] 21 40  
Collateralized mortgage obligations and mortgage backed securities | Level Two | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [5] 161 236  
Private equity | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [6] 181 185  
Private equity | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [6] 623 565  
Private equity | Level Three | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [6] 181 185  
Private equity | Level Three | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [6] 623 565  
Real estate | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [7] 93 86  
Real estate | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [7] 183 150  
Real estate | Level Three | US      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [7] 93 86  
Real estate | Level Three | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value [7] 183 150  
Other | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value 633 517  
Other | Level Three | International      
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value $ 633 $ 517  
[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.