Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue		$ 5,634	$ 5,356	$ 10,857	$ 12,811
Income (Loss) Before Taxes		542	(3,627)	928	(11,716)
Pretax segment operating income		807	396	1,471	1,172
Interest expense		136	144	272	281
Digital Integration
Segment Reporting Information [Line Items]
Revenue		817	619	1,590	1,503
Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		1,117	1,170	2,119	3,139
Production Systems
Segment Reporting Information [Line Items]
Revenue		1,681	1,557	3,271	3,469
Operating Segments
Segment Reporting Information [Line Items]
Revenue		5,634	5,356	10,857	12,811
Interest income		1		1	1
Interest expense		4	7	8	15
Operating Segments | Digital Integration
Segment Reporting Information [Line Items]
Revenue		817	619	1,590	1,503
Income (Loss) Before Taxes		274	108	521	259
Operating Segments | Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		1,117	1,170	2,119	3,139
Income (Loss) Before Taxes		156	22	258	156
Operating Segments | Well Construction
Segment Reporting Information [Line Items]
Revenue		2,110	2,089	4,045	4,904
Income (Loss) Before Taxes		272	180	482	511
Operating Segments | Production Systems
Segment Reporting Information [Line Items]
Revenue		1,681	1,557	3,271	3,469
Income (Loss) Before Taxes		171	145	309	336
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(91)	(79)	(168)	(204)
Income (Loss) Before Taxes		(66)	(59)	(99)	(90)
Corporate & other	[1]	(138)	(169)	(288)	(397)
Interest income	[2]	5	7	9	22
Interest expense	[3]	$ (132)	(137)	$ (264)	(266)
Charges and credits	[4]		$ (3,724)		$ (12,247)

[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; $- million in 2020).

[3] Interest expense excludes amounts which are included in the segments’ income ($4 million in 2021; $7 million in 2020).

[4] See Note 2 – Charges and Credits.