Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue		$ 5,356	$ 8,269	$ 12,811	$ 16,149
Income (Loss) Before Taxes		(3,627)	593	(11,716)	1,101
Pretax segment operating income		396	968	1,172	1,876
Interest expense		144	156	281	302
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,052	1,558	2,363	3,017
Drilling
Segment Reporting Information [Line Items]
Revenue		1,731	2,420	4,020	4,806
Production
Segment Reporting Information [Line Items]
Revenue		1,615	3,077	4,318	5,967
Cameron
Segment Reporting Information [Line Items]
Revenue		1,015	1,328	2,270	2,586
Operating Segments
Segment Reporting Information [Line Items]
Revenue		5,356	8,269	12,811	16,149
Interest income			2	1	5
Interest expense		7	10	15	20
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,052	1,558	2,363	3,017
Income (Loss) Before Taxes		185	317	369	598
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		1,731	2,420	4,020	4,806
Income (Loss) Before Taxes		165	301	450	608
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		1,615	3,077	4,318	5,967
Income (Loss) Before Taxes		25	235	237	453
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		1,015	1,328	2,270	2,586
Income (Loss) Before Taxes		80	165	201	313
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(57)	(114)	(160)	(227)
Income (Loss) Before Taxes		(59)	(50)	(85)	(96)
Corporate & other	[1]	(169)	(238)	(397)	(511)
Interest income	[2]	7	9	22	18
Interest expense	[3]	(137)	$ (146)	(266)	$ (282)
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 ($- million in 2020; $2 million in 2019).

[3] Interest expense excludes amounts which are included in the segments’ income ($7 million in 2020; $10 million in 2019).

[4] See Note 2 – Charges and Credits.