Multiclient Seismic Data - Change in Carrying Amount of Multiclient Seismic Data (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Multiclient Seismic Data [Abstract]
Opening balance	$ 568	$ 601
Capitalized in period	101	231
Charged to expense	(174)	(264)
Impairment charge (see Note 3)	(156)
Other	(22)
Ending balance	$ 317	$ 568