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Charges and Credits - Additional Information (Detail)	3 Months Ended
Charges and Credits - Additional Information (Detail)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($) Unit	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Charges And Credits [Line Items]
Total number of reporting units \| Unit		11
Goodwill		$ 16,000,000,000.0
Goodwill impairment charge		3,100,000,000
Goodwill		$ 12,924,000,000		$ 16,042,000,000
Expected increase/decrease in discount rate assumption		0.50%
Number of reporting units fair value to be impacted \| Unit		7
Intangible assets		$ 3,300,000,000
Charges And Credits		7,727,000,000	$ 0
Carrying Value Of Impaired Intangible Asset
Charges And Credits [Line Items]
Intangible assets		900,000,000
Carrying Value Of Asset Production Solutions \| North America
Charges And Credits [Line Items]
Intangible assets		1,300,000,000
North America pressure pumping asset impairments \| North America
Charges And Credits [Line Items]
Intangible assets		600,000,000
Severance \| Scenario Forecast [Member]
Charges And Credits [Line Items]
Intangible assets	$ 202,000,000
Other Restructuring
Charges And Credits [Line Items]
Intangible assets		79,000,000
Valuation allowance \| North America
Charges And Credits [Line Items]
Intangible assets		164,000,000
Cameron
Charges And Credits [Line Items]
Intangible assets		2,200,000,000
Smith International Inc Smith Aand Geoservices
Charges And Credits [Line Items]
Intangible assets		$ 1,100,000,000
Minimum
Charges And Credits [Line Items]
Discount rate utilized		12.00%
Maximum
Charges And Credits [Line Items]
Discount rate utilized		13.50%
Expected percentage change in fair value of reporting units		5.00%
Four Reporting Units [Member]
Charges And Credits [Line Items]
Total number of reporting units \| Unit		4
Goodwill		$ 4,500,000,000
Seven Reporting Units [Member]
Charges And Credits [Line Items]
Total number of reporting units \| Unit		7
Goodwill		$ 11,500,000,000
Six Reporting Units
Charges And Credits [Line Items]
Total number of reporting units \| Unit		6
Goodwill		$ 8,400,000,000
Six Reporting Units \| Minimum
Charges And Credits [Line Items]
Goodwill		200,000,000
Six Reporting Units \| Maximum
Charges And Credits [Line Items]
Goodwill		$ 5,000,000,000.0