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Business Segments and Geographic Areas - Business Segments (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
Segment Reporting Information [Line Items]
Revenue	$ 2,398	$ 2,154	$ 2,106	$ 1,795	$ 1,969	$ 1,835	$ 1,759	$ 1,741	$ 8,453	$ 7,304	$ 7,251
Operating profit (loss)									211	(277)	(2,411)
Capital expenditures									244	192	284
Depreciation and amortization									690	698	703
Goodwill	6,264				6,227				6,264	6,227	6,067
Total assets	19,796				20,206				19,796	20,206	21,140
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	3,011				2,956				3,011	2,956	2,874
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	2,041				2,122				2,041	2,122	2,058
Rig Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	1,212				1,149				1,212	1,149	1,135
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Revenue									(288)	(197)	(299)
Operating profit (loss)									(299)	(259)	(342)
Capital expenditures									5	8	75
Depreciation and amortization									14	16	16
Total assets	1,728				1,951				1,728	1,951	2,137
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									3,235	2,577	2,199
Operating profit (loss)									131	(102)	(770)
Capital expenditures									135	99	124
Depreciation and amortization									374	379	384
Goodwill	3,011				2,956				3,011	2,956	2,874
Total assets	7,929				7,848				7,929	7,848	7,911
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									2,931	2,672	2,241
Operating profit (loss)									166	98	(266)
Capital expenditures									87	69	61
Depreciation and amortization									212	215	209
Goodwill	2,041				2,122				2,041	2,122	2,058
Total assets	6,233				5,782				6,233	5,782	5,765
Operating Segments [Member] | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									2,575	2,252	3,110
Operating profit (loss)									213	(14)	(1,033)
Capital expenditures									17	16	24
Depreciation and amortization									90	88	94
Goodwill	1,212				1,149				1,212	1,149	1,135
Total assets	$ 3,906				$ 4,625				$ 3,906	$ 4,625	$ 5,327

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