Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue		$ 5,847	$ 5,258	$ 16,704		$ 18,069
Income (Loss) Before Taxes		691	(54)	1,618		(11,769)
Pretax segment operating income		908	575	2,379		1,747
Interest expense		130	138	402		419
Digital Integration
Segment Reporting Information [Line Items]
Revenue		812	738	2,401		2,235
Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		1,192	1,215	3,312		4,354
Production Systems
Segment Reporting Information [Line Items]
Revenue		1,674	1,532	4,946		5,001
Operating Segments
Segment Reporting Information [Line Items]
Revenue		5,847	5,258	16,704		18,069
Interest income				1		1
Interest expense		3	7	11		22
Operating Segments | Digital Integration
Segment Reporting Information [Line Items]
Revenue		812	738	2,401		2,235
Income (Loss) Before Taxes		284	201	805		458
Operating Segments | Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		1,192	1,215	3,312		4,354
Income (Loss) Before Taxes		190	103	448		259
Operating Segments | Well Construction
Segment Reporting Information [Line Items]
Revenue		2,273	1,837	6,319		6,747
Income (Loss) Before Taxes		345	173	827		687
Operating Segments | Production Systems
Segment Reporting Information [Line Items]
Revenue		1,674	1,532	4,946		5,001
Income (Loss) Before Taxes		166	132	475		467
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(104)	(64)	(274)		(268)
Income (Loss) Before Taxes		(77)	(34)	(176)		(124)
Corporate & other	[1]	(145)	(151)	(434)		(548)
Interest income		8	3	17	[2]	25	[2]
Interest expense	[3]	(127)	(131)	(391)		(397)
Charges and credits	[4]	$ 47	$ (350)	$ 47		$ (12,596)

[1] Comprised principally of certain corporate expenses not allocated to the segments, stock-based compensation costs, amortization expense associated with certain intangible assets, certain centrally managed initiatives and other nonoperating items.

[2] Interest income excludes amounts which are included in the segments’ income ($1 million in 2021; $1 million in 2020).

[3] Interest expense excludes amounts which are included in the segments’ income ($3 million in 2021; $7 million in 2020).

[4] See Note 2 – Charges and Credits.