v3.19.3.a.u2
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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 $ 17