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Business Segments and Geographic Areas - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 1,969	$ 1,835	$ 1,759	$ 1,741	$ 1,692	$ 1,646	$ 1,724	$ 2,189	$ 7,304	$ 7,251	$ 14,757
Operating profit (loss)									(277)	(2,411)	(390)
Capital expenditures									192	284	453
Depreciation and amortization									698	703	747
Goodwill	6,227				6,067				6,227	6,067	6,980
Total assets	20,206				21,140				20,206	21,140	25,970
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	2,956				2,874				2,956	2,874	2,874
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	2,122				2,058				2,122	2,058	1,997
Rig Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	1,149				1,135				1,149	1,135	2,109
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									2,577	2,199	3,718
Operating profit (loss)									(102)	(770)	(1,573)
Capital expenditures									99	124	180
Depreciation and amortization									379	384	403
Goodwill	2,956				2,874				2,956	2,874	2,874
Total assets	7,848				7,911				7,848	7,911	8,766
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									2,672	2,241	3,365
Operating profit (loss)									98	(266)	187
Capital expenditures									69	61	87
Depreciation and amortization									215	209	223
Goodwill	2,122				2,058				2,122	2,058	1,997
Total assets	5,782				5,765				5,782	5,765	5,916
Operating Segments [Member] | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									2,252	3,110	8,279
Operating profit (loss)									(14)	(1,033)	1,501
Capital expenditures									16	24	91
Depreciation and amortization									88	94	107
Goodwill	1,149				1,135				1,149	1,135	2,109
Total assets	4,625				5,327				4,625	5,327	9,227
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Revenue									(197)	(299)	(605)
Operating profit (loss)									(259)	(342)	(505)
Capital expenditures									8	75	95
Depreciation and amortization									16	16	14
Total assets	$ 1,951				$ 2,137				$ 1,951	$ 2,137	$ 2,061

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