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Revenue Recognition - Summary of Disaggregate Revenue by Destinations (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Disaggregate revenue	$ 2,398	$ 2,154	$ 2,106	$ 1,795	$ 1,969	$ 1,835	$ 1,759	$ 1,741	$ 8,453	$ 7,304	$ 7,251
Operating Segments [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									3,235	2,577	2,199
Operating Segments [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									2,931	2,672	2,241
Operating Segments [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									2,575	2,252	3,110
Intersegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									(288)	(197)	(299)
Continental [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									73	53	170
Continental [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									86	51	44
Continental [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									129	93	85
Continental [Member] | Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									(288)	(197)	(299)
Land and Offshore [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									73	53	170
Land and Offshore [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									86	51	44
Land and Offshore [Member] | Operating Segments [Member] | Intersubsegment Eliminations [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									129	93	85
Land and Offshore [Member] | Intersegment Eliminations [Member] | Intersubsegment Eliminations [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									(288)	(197)	(299)
North America [Member] | Continental [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									3,782	3,046	2,178
North America [Member] | Continental [Member] | Operating Segments [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,817	1,408	925
North America [Member] | Continental [Member] | Operating Segments [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,302	1,093	793
North America [Member] | Continental [Member] | Operating Segments [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									663	545	460
International [Member] | Continental [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									4,671	4,258	5,073
International [Member] | Continental [Member] | Operating Segments [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,345	1,116	1,104
International [Member] | Continental [Member] | Operating Segments [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,543	1,528	1,404
International [Member] | Continental [Member] | Operating Segments [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,783	1,614	2,565
Land Destination [Member] | Land and Offshore [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									5,522	4,539	3,658
Land Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									2,683	2,047	1,497
Land Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									1,985	1,752	1,342
Land Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									854	740	819
Offshore Destination [Member] | Land and Offshore [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									2,931	2,765	3,593
Offshore Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Wellbore Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									479	477	532
Offshore Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Completion & Production Solutions [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									860	869	855
Offshore Destination [Member] | Land and Offshore [Member] | Operating Segments [Member] | Rig Technologies [Member]
Disaggregation of Revenue [Line Items]
Disaggregate revenue									$ 1,592	$ 1,419	$ 2,206

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