Business Segments and Geographic Areas - Business Segments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 6,090	$ 8,479	$ 8,453
Operating profit (loss)	(2,425)	(6,279)	211
Capital expenditures	226	233	244
Depreciation and amortization	352	533	690
Goodwill	1,493	2,807	6,264
Total assets	9,929	13,149	19,796
Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	308	843	3,011
Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Goodwill	473	1,054	2,041
Rig Technologies [Member]
Segment Reporting Information [Line Items]
Goodwill	712	910	1,212
Eliminations and Corporate Costs [Member]
Segment Reporting Information [Line Items]
Revenue	(129)	(188)	(288)
Operating profit (loss)	(228)	(270)	(299)
Capital expenditures	11	15	5
Depreciation and amortization	13	12	14
Total assets	1,869	1,487	1,728
Operating Segments [Member] | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Revenue	1,867	3,214	3,235
Operating profit (loss)	(858)	(3,551)	131
Capital expenditures	87	123	135
Depreciation and amortization	187	284	374
Goodwill	308	843	3,011
Total assets	2,665	4,078	7,929
Operating Segments [Member] | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	2,433	2,771	2,931
Operating profit (loss)	(977)	(1,934)	166
Capital expenditures	48	64	87
Depreciation and amortization	75	150	212
Goodwill	473	1,054	2,041
Total assets	2,472	3,826	6,233
Operating Segments [Member] | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Revenue	1,919	2,682	2,575
Operating profit (loss)	(362)	(524)	213
Capital expenditures	80	31	17
Depreciation and amortization	77	87	90
Goodwill	712	910	1,212
Total assets	$ 2,923	$ 3,758	$ 3,906