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Multiclient Seismic Data - Change in Carrying Amount of Multiclient Seismic Data (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2020
USD ($)
Multiclient Seismic Data [Abstract]  
Opening balance $ 568
Capitalized in period 86
Charged to expense (132)
Impairments (See Note 2) (156)
Other (22)
Ending balance $ 344