Pension and Other Benefit Plans - Fair Value of Schlumberger's Pension Plan Assets (Detail) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		$ 3,748	$ 4,058	$ 3,625
International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		7,872	8,507	$ 7,194
Level One | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		789	2,150
Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		3,514	4,593
Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		2,688	1,578
Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		3,126	3,136
Level Three | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		271	330
Level Three | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		1,232	778
Cash and cash equivalents | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		80	112
Cash and cash equivalents | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		157	307
Cash and cash equivalents | Level One | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		44	92
Cash and cash equivalents | Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		75	69
Cash and cash equivalents | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		36	20
Cash and cash equivalents | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		82	238
Equity securities, US | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	501	1,324
Equity securities, US | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	2,421	3,286
Equity securities, US | Level One | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	416	1,148
Equity securities, US | Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	2,028	2,642
Equity securities, US | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	85	176
Equity securities, US | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[1]	393	644
Equity securities, International | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	267	757
Equity securities, International | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	1,526	2,160
Equity securities, International | Level One | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	263	747
Equity securities, International | Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	1,406	1,871
Equity securities, International | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	4	10
Equity securities, International | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[2]	120	289
Corporate bonds | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[3]	1,517	771
Corporate bonds | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[3]	923	841
Corporate bonds | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[3]	1,517	771
Corporate bonds | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[3]	923	841
Government and government-related debt securities | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	1,072	656
Government and government-related debt securities | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	1,377	985
Government and government-related debt securities | Level One | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	66	163
Government and government-related debt securities | Level One | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	5	11
Government and government-related debt securities | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	1,006	493
Government and government-related debt securities | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[4]	1,372	974
Collateralized mortgage obligations and mortgage backed securities | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[5]	40	108
Collateralized mortgage obligations and mortgage backed securities | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[5]	236	150
Collateralized mortgage obligations and mortgage backed securities | Level Two | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[5]	40	108
Collateralized mortgage obligations and mortgage backed securities | Level Two | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[5]	236	150
Private equity | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[6]	185	183
Private equity | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[6]	565	477
Private equity | Level Three | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[6]	185	183
Private equity | Level Three | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[6]	565	477
Real estate | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[7]	86	147
Real estate | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[7]	150	168
Real estate | Level Three | US
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[7]	86	147
Real estate | Level Three | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value	[7]	150	168
Other | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		517	133
Other | Level Three | International
Defined Benefit Plan Disclosure [Line Items]
Plan assets at fair value		$ 517	$ 133

[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.