Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue		$ 30,440	$ 27,810	$ 35,475
Income Before Taxes		(1,183)	(1,905)	2,881
Assets		71,987	77,956	68,005
Depreciation and Amortization	[1]	3,837	4,094	4,078
Capital Expenditures		2,107	2,055	2,410
Pretax operating income		3,921	3,273	6,510
Interest expense		566	570	346
Charges & credits		3,764	3,820	2,575
Operating Segments
Segment Reporting Information [Line Items]
Revenue		30,440	27,810	35,475
Interest income		21	26	22
Interest expense		53	53	30
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		6,786	6,648	9,501
Income Before Taxes		1,251	1,249	2,450
Assets		4,892	6,890	8,266
Depreciation and Amortization		988	1,104	1,279
Capital Expenditures		305	532	648
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		8,392	8,561	13,563
Income Before Taxes		1,151	994	2,538
Assets		5,421	6,747	8,562
Depreciation and Amortization		685	904	1,177
Capital Expenditures		629	425	673
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		10,639	8,804	12,548
Income Before Taxes		928	507	1,585
Assets		12,326	10,476	9,938
Depreciation and Amortization		1,249	1,234	1,216
Capital Expenditures		889	655	824
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		5,205	4,211
Income Before Taxes		733	653
Assets		3,978	4,246
Depreciation and Amortization		264	211
Capital Expenditures		150	176
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(582)	(414)	(137)
Income Before Taxes		(142)	(130)	(63)
Assets		1,881	1,605	2,039
Depreciation and Amortization		213	257	213
Capital Expenditures		134	267	265
Goodwill and intangible assets		34,472	34,845	20,174
Cash and short term investments		5,089
Cash, short term investments and fixed income investments			9,495	13,452
All other assets		3,928	3,652	5,574
Corporate & other	[2]	(934)	(925)	(768)
Interest income	[3]	107	84	30
Interest expense	[4]	(513)	(517)	(316)
Charges & credits	[5]	(3,764)	(3,820)	(2,575)
Eliminations & other | Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and Amortization	[2]	$ 438	$ 384	$ 193

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

[2] Comprised principally of certain corporate expenses not allocated to the segments, stock-based compensation costs, amortization expense associated with certain intangible assets (including intangible asset amortization expense resulting from the 2016 acquisition of Cameron), certain centrally managed initiatives and other nonoperating items.

[3] Interest income excludes amounts which are included in the segments’ income (2017: $21 million; 2016: $26 million; 2015: $22 million).

[4] Interest expense excludes amounts which are included in the segments’ income (2017: $53 million; 2016: $53 million; 2015: $30 million).

[5] See Note 3 – Charges and Credits.