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Suspended Wells-Exploratory Capitalized Well Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year $ 814 $ 711 $ 786
2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year 265    
2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year 374    
2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year 175    
Greater Poseidon-Australia [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 177    
Greater Poseidon-Australia [Member] | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 0    
Greater Poseidon-Australia [Member] | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 157    
Greater Poseidon-Australia [Member] | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 20    
NPR-A-Alaska [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 149    
NPR-A-Alaska [Member] | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 111    
NPR-A-Alaska [Member] | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 38    
NPR-A-Alaska [Member] | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 0    
Barossa/Caldita-Australia [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 136    
Barossa/Caldita-Australia [Member] | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 59    
Barossa/Caldita-Australia [Member] | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 0    
Barossa/Caldita-Australia [Member] | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[2] 77    
Surmont - Canada      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 118    
Surmont - Canada | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 6    
Surmont - Canada | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 55    
Surmont - Canada | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 57    
Middle Magdalena Basin-Columbia      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 68    
Middle Magdalena Basin-Columbia | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 0    
Middle Magdalena Basin-Columbia | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 68    
Middle Magdalena Basin-Columbia | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 0    
Narwhal Trend Alaska [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 52    
Narwhal Trend Alaska [Member] | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 52    
Narwhal Trend Alaska [Member] | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 0    
Narwhal Trend Alaska [Member] | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [3] 0    
Kamunsu East-Malaysia      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 19    
Kamunsu East-Malaysia | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 0    
Kamunsu East-Malaysia | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 19    
Kamunsu East-Malaysia | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 0    
NC 98-Libya      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 15    
NC 98-Libya | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 0    
NC 98-Libya | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 11    
NC 98-Libya | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 4    
WL4-00-Malaysia      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 17    
WL4-00-Malaysia | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 17    
WL4-00-Malaysia | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 0    
WL4-00-Malaysia | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1] 0    
Other Projects [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[3] 63    
Other Projects [Member] | 2016 - 2018 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[3] 20    
Other Projects [Member] | 2013 - 2015 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[3] 26    
Other Projects [Member] | 2004 - 2012 [Member]      
Aging of exploratory well costs that have been capitalized for more than one year      
Aging of Exploratory Well Cost that have been capitalized for more than one year [1],[3] $ 17    
[1]
(2)Appraisal drilling complete;
 
costs being incurred
 
to assess development.
[2]
(3)Assets held for sale as of December
 
31, 2019.
[3]
(1)Additional appraisal wells planned.