Segment Information - Schedule of Segment Reporting Information, by Segment (Detail) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2019		Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue		$ 8,541		$ 8,504		$ 24,689		$ 24,636
Income (Loss) Before Taxes		(11,971)		787		(10,870)		1,976
Pretax segment operating income		1,096		1,152		2,972		3,220
Interest expense		160		147		462		434
Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,651		1,587		4,669		4,602
Drilling
Segment Reporting Information [Line Items]
Revenue		2,470		2,429		7,279		6,789
Production
Segment Reporting Information [Line Items]
Revenue		3,153		3,249		9,120		9,458
Cameron
Segment Reporting Information [Line Items]
Revenue		1,363		1,386		3,949		4,175
Operating Segments
Segment Reporting Information [Line Items]
Revenue		8,541		8,504		24,689		24,636
Interest income		1		2		6		7
Interest expense		9		8		29		29
Operating Segments | Reservoir Characterization
Segment Reporting Information [Line Items]
Revenue		1,651		1,587		4,669		4,602
Income (Loss) Before Taxes		360		361		959		987
Operating Segments | Drilling
Segment Reporting Information [Line Items]
Revenue		2,470		2,429		7,279		6,789
Income (Loss) Before Taxes		305		339		913		921
Operating Segments | Production
Segment Reporting Information [Line Items]
Revenue		3,153		3,249		9,120		9,458
Income (Loss) Before Taxes		288		320		740		853
Operating Segments | Cameron
Segment Reporting Information [Line Items]
Revenue		1,363		1,386		3,949		4,175
Income (Loss) Before Taxes		173		160		486		522
Eliminations & other
Segment Reporting Information [Line Items]
Revenue		(96)		(147)		(328)		(388)
Income (Loss) Before Taxes		(30)		(28)		(126)		(63)
Corporate & other	[1]	(231)		(234)		(742)		(699)
Interest income		7	[2]	8	[2]	25	[3]	44	[3]
Interest expense		(151)	[4]	$ (139)	[4]	(433)	[5]	(405)	[5]
Charges and credits	[6]	$ (12,692)				$ (12,692)		$ (184)

[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 2019; $2 million in 2018).

[3] Interest income excludes amounts which are included in the segments’ income ($6 million in 2019; $7 million in 2018).

[4] Interest expense excludes amounts which are included in the segments’ income ($9 million in 2019; $8 million in 2018).

[5] Interest expense excludes amounts which are included in the segments’ income ($29 million in both 2019 and 2018).

[6] See Note 2 – Charges and Credits.