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Business Segments and Geographic Areas - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 1,692	$ 1,646	$ 1,724	$ 2,189	$ 2,722	$ 3,306	$ 3,909	$ 4,820	$ 7,251	$ 14,757	$ 21,440
Operating profit (loss)									(2,411)	(390)	3,613
Capital expenditures									284	453	699
Depreciation and amortization									703	747	778
Goodwill	6,067				6,980				6,067	6,980	8,539
Total assets	21,140				25,970				21,140	25,970	33,562
Rig Systems [Member]
Segment Reporting Information [Line Items]
Goodwill	258				1,232				258	1,232	1,236
Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Goodwill	877				877				877	877	877
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	2,874				2,874				2,874	2,874	4,357
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	2,058				1,997				2,058	1,997	2,069
Operating Segments [Member] | Rig Systems [Member]
Segment Reporting Information [Line Items]
Revenue									2,386	6,964	9,848
Operating profit (loss)									(969)	1,322	2,118
Capital expenditures									20	81	133
Depreciation and amortization									72	84	86
Goodwill	258				1,232				258	1,232	1,236
Total assets	3,255				6,772				3,255	6,772	8,052
Operating Segments [Member] | Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Revenue									1,416	2,515	3,222
Operating profit (loss)									229	652	935
Capital expenditures									4	10	12
Depreciation and amortization									22	23	26
Goodwill	877				877				877	877	877
Total assets	2,072				2,455				2,072	2,455	2,789
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									2,199	3,718	5,722
Operating profit (loss)									(770)	(1,573)	1,000
Capital expenditures									124	180	262
Depreciation and amortization									384	403	438
Goodwill	2,874				2,874				2,874	2,874	4,357
Total assets	7,911				8,766				7,911	8,766	11,687
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									2,241	3,365	4,645
Operating profit (loss)									(266)	187	730
Capital expenditures									61	87	184
Depreciation and amortization									209	223	223
Goodwill	2,058				1,997				2,058	1,997	2,069
Total assets	5,765				5,916				5,765	5,916	7,072
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Revenue									(991)	(1,805)	(1,997)
Operating profit (loss)									(635)	(978)	(1,170)
Capital expenditures									75	95	108
Depreciation and amortization									16	14	5
Total assets	$ 2,137				$ 2,061				$ 2,137	$ 2,061	$ 3,962

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