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Changes in the Group structure - Divestment projects (Details) - USD ($)
$ in Millions
Nov. 27, 2017
Nov. 03, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Divestment projects          
Assets     $ 242,631 $ 230,978 $ 224,484
Martin Linge field and Garantiana Discovery          
Divestment projects          
Assets     2,581    
Liabilities     1,106    
Martin Linge field          
Divestment projects          
Interest in joint operation (as a percent) 51.00%        
Garantiana Discovery          
Divestment projects          
Interest in joint operation (as a percent) 40.00%        
TotalErg joint venture          
Divestment projects          
Ownership interest held by the co-venturer (in percent)   51.00%      
Ownership interest held by TOTAL (as a percent)   49.00%      
Assets     $ 166