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Provisions and other non-current liabilities - Changes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 13, 2018
Mar. 08, 2018
Changes in provisions and other non-current liabilities          
Balance as of the beginning of the period $ 15,986 $ 16,846 $ 17,502    
Allowances 2,416 1,172 1,569    
Reversals (1,378) (1,612) (1,268)    
Currency translation adjustment (519) 681 (484)    
Other 4,927 (1,101) (473)    
Balance as of the end of the period 21,432 15,986 16,846    
Maersk Oil          
Changes in provisions and other non-current liabilities          
Asset retirement obligation         $ 2,003
Engie's portfolio of LNG assets          
Changes in provisions and other non-current liabilities          
Asset retirement obligation       $ 1,766  
Additional purchase price estimated at the acquisition date       $ 550  
Asset retirement obligations          
Changes in provisions and other non-current liabilities          
Allowances 530 544 523    
Reversals (320) (330) (502)    
Provisions for environmental contingencies          
Changes in provisions and other non-current liabilities          
Allowances 33 37 29    
Reversals (111) (120) (82)    
Restructuring activities          
Changes in provisions and other non-current liabilities          
Allowances 149 48 25    
Reversals $ (106) $ (84) $ (68)