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Business Segments and Geographic Areas - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 2,722	$ 3,306	$ 3,909	$ 4,820	$ 5,709	$ 5,587	$ 5,255	$ 4,889	$ 14,757	$ 21,440	$ 19,221
Operating profit (loss)									(390)	3,613	3,199
Capital expenditures									453	699	614
Depreciation and amortization									747	778	738
Goodwill	6,980				8,539				6,980	8,539	9,049
Total assets	26,725				33,562				26,725	33,562	34,812
Rig Systems [Member]
Segment Reporting Information [Line Items]
Goodwill	1,232				1,236				1,232	1,236	1,279
Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Goodwill	877				877				877	877	906
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	2,874				4,357				2,874	4,357	4,425
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	1,997				2,069				1,997	2,069	2,106
Operating Segments [Member] | Rig Systems [Member]
Segment Reporting Information [Line Items]
Revenue									6,964	9,848	8,450
Operating profit (loss)									1,206	1,996	1,594
Capital expenditures									81	133	61
Depreciation and amortization									96	88	82
Goodwill	1,232				1,236				1,232	1,236	1,279
Total assets	6,772				8,052				6,772	8,052	7,654
Operating Segments [Member] | Rig Aftermarket [Member]
Segment Reporting Information [Line Items]
Revenue									2,515	3,222	2,692
Operating profit (loss)									605	882	729
Capital expenditures									10	12	24
Depreciation and amortization									30	27	26
Goodwill	877				877				877	877	906
Total assets	2,455				2,789				2,455	2,789	2,475
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									3,718	5,722	5,211
Operating profit (loss)									(1,613)	937	915
Capital expenditures									180	262	226
Depreciation and amortization									400	439	420
Goodwill	2,874				4,357				2,874	4,357	4,425
Total assets	8,766				11,687				8,766	11,687	11,862
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									3,365	4,645	4,309
Operating profit (loss)									161	690	613
Capital expenditures									87	184	212
Depreciation and amortization									221	224	210
Goodwill	1,997				2,069				1,997	2,069	2,106
Total assets	5,916				7,072				5,916	7,072	7,287
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue									(1,805)	(1,997)	(1,441)
Operating profit (loss)									(749)	(892)	(652)
Capital expenditures									95	108	91
Total assets	$ 2,816				$ 3,962				$ 2,816	$ 3,962	3,351
Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Goodwill											333
Total assets											$ 2,183

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