XML 32 R99.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Accounting for Suspended Exploratory Wells - Aging of Costs on a Well and Project Basis (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Well
Project
Dec. 31, 2018
USD ($)
Project
Dec. 31, 2017
USD ($)
Project
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 2,827 $ 3,361 $ 3,395
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 123    
Number of projects (in projects) | Project 22 30 32
1998-2008      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 244    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 27    
2009-2013      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,166    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 56    
2014-2018      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,417    
Capitalized exploratory well costs that have been capitalized for period greater than one year, number of wells | Well 40    
2003-2011      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 318    
Number of projects (in projects) | Project 4    
2012-2015      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 1,653    
Number of projects (in projects) | Project 11    
2016-2019      
Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items]      
Capitalized exploratory well costs that have been capitalized for period greater than one year $ 856    
Number of projects (in projects) | Project 7