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Business Segments and Geographic Areas - Business Segments (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 2,281	$ 2,126	$ 2,132	$ 1,940	$ 2,398	$ 2,154	$ 2,106	$ 1,795	$ 8,479	$ 8,453	$ 7,304
Operating profit (loss)									(6,279)	211	(277)
Capital expenditures									233	244	192
Depreciation and amortization									533	690	698
Goodwill	2,807				6,264				2,807	6,264	6,227
Total assets	13,149				19,796				13,149	19,796	20,206
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	843				3,011				843	3,011	2,956
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	1,054				2,041				1,054	2,041	2,122
Rig Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	910				1,212				910	1,212	1,149
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Revenue									(188)	(288)	(197)
Operating profit (loss)									(270)	(299)	(259)
Capital expenditures									15	5	8
Depreciation and amortization									12	14	16
Total assets	1,487				1,728				1,487	1,728	1,951
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									3,214	3,235	2,577
Operating profit (loss)									(3,551)	131	(102)
Capital expenditures									123	135	99
Depreciation and amortization									284	374	379
Goodwill	843				3,011				843	3,011	2,956
Total assets	4,078				7,929				4,078	7,929	7,848
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue									2,771	2,931	2,672
Operating profit (loss)									(1,934)	166	98
Capital expenditures									64	87	69
Depreciation and amortization									150	212	215
Goodwill	1,054				2,041				1,054	2,041	2,122
Total assets	3,826				6,233				3,826	6,233	5,782
Operating Segments [Member] | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Revenue									2,682	2,575	2,252
Operating profit (loss)									(524)	213	(14)
Capital expenditures									31	17	16
Depreciation and amortization									87	90	88
Goodwill	910				1,212				910	1,212	1,149
Total assets	$ 3,758				$ 3,906				$ 3,758	$ 3,906	$ 4,625

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