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Exploratory Well Costs (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Capitalized Exploratory Well Costs [Abstract]        
Suspended exploratory well costs $ 888   $ 888 $ 1,200
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]        
Suspended exploratory well costs previously capitalized for a period greater than one year since the completion of drilling at December 31, 2016, charged to exploration expense     $ 392  
Unproved Shenandoah Properties [Member]        
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]        
Suspended exploratory well cost expensed   $ 435    
Grand Fuerte area in Colombia [Member]        
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]        
Suspended exploratory well cost expensed 241      
Côte d’Ivoire Wells [Member]        
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]        
Suspended exploratory well cost expensed $ 119