Charges and Credits - Additional Information (Detail) - USD ($)	3 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2017
Charges And Credits [Line Items]
Charges and credits, pre tax						$ 674,000,000
Charges and credits		$ 0		$ 50,000,000		631,000,000
Promissory note in exchange of accounts receivable				$ 700,000,000		$ 700,000,000
Promissory note term				3 years
Promissory note interest rate				6.50%		6.50%
Charge relating to one-time mandatory tax on previously deferred foreign earnings			$ 410,000,000				$ 410,000,000
Tax credits resulting from remeasurement of net deferred tax liabilities			334,000,000
US tax reform
Charges And Credits [Line Items]
Charges and credits			$ 76,000,000
US tax reform | Tax Year2018
Charges And Credits [Line Items]
Reduced corporate income tax rate							21.00%
Impairments and Other | Headcount Reductions
Charges And Credits [Line Items]
Charges and credits, pre tax	$ 184,000,000
Charges and credits	$ 164,000,000
Promissory Note Fair Value Adjustment and Other
Charges And Credits [Line Items]
Charges and credits, pre tax						$ 510,000,000
Charges and credits				$ 460,000,000		498,000,000
Merger and Integration
Charges And Credits [Line Items]
Charges and credits, pre tax						164,000,000
Charges and credits						$ 133,000,000
Merger and Integration | Cameron International Corporation
Charges And Credits [Line Items]
Charges and credits				$ 81,000,000
Merger and Integration | Merger-related employee benefits | Cameron International Corporation
Charges And Credits [Line Items]
Charges and credits					$ 82,000,000