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.