Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue		$ 23,601	$ 32,917	$ 32,815
Income Before Taxes		(11,298)	(10,418)	2,624
Assets		42,434	56,312	70,507
Depreciation and Amortization	[1]	2,566	3,589	3,556
Capital Investments		1,520	2,736	3,241
Pretax segment operating income		2,401	3,978	4,187
Interest expense		563	609	575
Charges & credits		12,515	12,901	141
Digital Integration
Segment Reporting Information [Line Items]
Revenue		3,076	4,145	3,820
Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		5,602	9,299	10,050
Well Construction
Segment Reporting Information [Line Items]
Revenue		8,605	11,880	11,310
Production Systems
Segment Reporting Information [Line Items]
Revenue		6,650	8,167	8,168
Operating Segments
Segment Reporting Information [Line Items]
Revenue		23,601	32,917	32,815
Interest income		2	8	8
Interest expense		28	38	38
Operating Segments | Digital Integration
Segment Reporting Information [Line Items]
Revenue		3,076	4,145	3,820
Income Before Taxes		731	882	882
Assets		3,595	6,388	6,784
Depreciation and Amortization		615	1,069	894
Capital Investments		413	1,020	1,091
Operating Segments | Reservoir Performance
Segment Reporting Information [Line Items]
Revenue		5,602	9,299	10,050
Income Before Taxes		353	992	1,169
Assets		3,489	5,198	7,396
Depreciation and Amortization		549	807	850
Capital Investments		384	569	899
Operating Segments | Well Construction
Segment Reporting Information [Line Items]
Revenue		8,605	11,880	11,310
Income Before Taxes		866	1,429	1,465
Assets		4,768	6,913	7,112
Depreciation and Amortization		580	656	713
Capital Investments		420	650	769
Operating Segments | Production Systems
Segment Reporting Information [Line Items]
Revenue		6,650	8,167	8,168
Income Before Taxes		623	847	843
Assets		4,665	5,625	5,632
Depreciation and Amortization		338	390	423
Capital Investments		240	384	343
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(332)	(574)	(533)
Income Before Taxes		(172)	(172)	(172)
Assets		940	1,314	1,448
Depreciation and Amortization		276	250	237
Capital Investments		63	113	139
Goodwill and intangible assets		16,436	23,130	33,658
Cash and short-term investments		3,006	2,167	2,777
All other assets		5,535	5,577	5,700
Corporate & other	[2]	(681)	(957)	(937)
Interest income	[3]	31	33	52
Interest expense	[4]	(534)	(571)	(537)
Charges & credits	[5]	(12,515)	(12,901)	(141)
Eliminations & other | Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and Amortization	[2]	$ 208	$ 417	$ 439

[1] Includes depreciation of property, plant and equipment and amortization of intangible assets, multiclient seismic data costs and APS investments.

[2] 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.

[3] Interest income excludes amounts which are included in the segments’ income (2020: $2 million; 2019: $8 million; 2018: $8 million).

[4] Interest expense excludes amounts which are included in the segments’ income (2020: $28 million; 2019: $38 million; 2018: $38 million).

[5] See Note 3 – Charges and Credits.