Charges and Credits - Summary of Charges and Credits (Detail) - USD ($)		3 Months Ended				9 Months Ended
	Apr. 02, 2016	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 50,000,000	$ 82,000,000		$ 0	$ 723,000,000	$ 3,144,000,000
Charges and credits, Tax						44,000,000	492,000,000
Charges and credits, Noncontolling interests						12,000,000
Charges and credits, Net						667,000,000	2,652,000,000
Promissory Note Fair Value Adjustment and Other
Charges And Credits [Line Items]
Charges and credits, Pretax		$ 460,000,000				510,000,000
Charges and credits, Noncontolling interests						12,000,000
Charges and credits, Net						498,000,000
Merger and Integration
Charges And Credits [Line Items]
Charges and credits, Pretax	$ 185,000,000			$ 88,000,000		213,000,000
Charges and credits, Tax						44,000,000
Charges and credits, Net						$ 169,000,000
Merger and Integration | Merger-related employee benefits
Charges And Credits [Line Items]
Charges and credits, Pretax							93,000,000
Charges and credits, Tax							17,000,000
Charges and credits, Net							76,000,000
Merger and Integration | Professional fees
Charges And Credits [Line Items]
Charges and credits, Pretax							45,000,000
Charges and credits, Tax							10,000,000
Charges and credits, Net							35,000,000
Merger and Integration | Facility closure costs
Charges And Credits [Line Items]
Charges and credits, Pretax							51,000,000
Charges and credits, Tax							13,000,000
Charges and credits, Net							38,000,000
Merger and Integration | Other merger and integration-related
Charges And Credits [Line Items]
Charges and credits, Pretax							83,000,000
Charges and credits, Tax							11,000,000
Charges and credits, Net							72,000,000
Cost of Sales | Amortization of inventory fair value adjustment
Charges And Credits [Line Items]
Charges and credits, Pretax							299,000,000
Charges and credits, Tax							90,000,000
Charges and credits, Net							209,000,000
Impairment And Other | Workforce reduction
Charges And Credits [Line Items]
Charges and credits, Pretax							646,000,000
Charges and credits, Tax							63,000,000
Charges and credits, Net							583,000,000
Impairment And Other | North America pressure pumping asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax							209,000,000
Charges and credits, Tax							67,000,000
Charges and credits, Net							142,000,000
Impairment And Other | Facilities impairments
Charges And Credits [Line Items]
Charges and credits, Pretax							165,000,000
Charges and credits, Tax							58,000,000
Charges and credits, Net							107,000,000
Impairment And Other | Other fixed asset impairments
Charges And Credits [Line Items]
Charges and credits, Pretax							684,000,000
Charges and credits, Tax							52,000,000
Charges and credits, Net							632,000,000
Impairment And Other | Inventory write-downs
Charges And Credits [Line Items]
Charges and credits, Pretax							616,000,000
Charges and credits, Tax							49,000,000
Charges and credits, Net							567,000,000
Impairment And Other | Multiclient seismic data impairment
Charges And Credits [Line Items]
Charges and credits, Pretax							198,000,000
Charges and credits, Tax							62,000,000
Charges and credits, Net							136,000,000
Impairment And Other | Other restructuring charges
Charges And Credits [Line Items]
Charges and credits, Pretax							55,000,000
Charges and credits, Net							$ 55,000,000