Business Segments and Geographic Areas - Business Segments (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (2,425)	$ (6,279)	$ 211
Goodwill Indefinite Lived And Finite Lived Intangible And Long Lived Tangible Assets | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	665	3,565
Goodwill Indefinite Lived And Finite Lived Intangible And Long Lived Tangible Assets | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	1,010	1,865
Goodwill Indefinite Lived And Finite Lived Intangible And Long Lived Tangible Assets | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	198	389
Inventory Charges | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	50	130
Inventory Charges | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	101	148
Inventory Charges | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	175	355
Voluntary Early Retirement Program | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		64
Voluntary Early Retirement Program | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		30
Voluntary Early Retirement Program | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)		$ 37
Severance And Facility Closures Cost | Wellbore Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	134
Severance And Facility Closures Cost | Completion & Production Solutions [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	21
Severance And Facility Closures Cost | Rig Technologies [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ 29