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Intangible and tangible assets - Change in net property, plant and equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Analysis of change in net property, plant and equipment      
Net amount as of the beginning of the period $ 113,324 $ 109,397 $ 111,971
Expenditures 11,426 13,336 13,363
Disposals (1,052) (2,494) (1,117)
Depreciation and impairment (15,097) (13,732) (15,099)
Currency translation adjustment (270) (1,454) 2,302
Other 8,077 8,271 (2,023)
Net amount as of the end of the period 116,408 113,324 109,397
Impact of impairments of assets 669 1,707 3,901
Impact of finance lease contracts     855
Impact of the asset for site restitution     (773)
Effect of application of IFRS 16 5,698    
Effect of entries in the consolidation scope   6,987  
Reclassification as non-current assets held for sale and discontinued operations     $ (2,604)
Reversal of reclassification as non-current assets held for sale and discontinued operations 812 $ 2,604  
Anadarko Mozambique      
Analysis of change in net property, plant and equipment      
Effect of entries in the consolidation scope $ 767    
Ichthys LNG project      
Analysis of change in net property, plant and equipment      
Percentage of interest sold 4.00% 4.00%  
Reclassification as non-current assets held for sale and discontinued operations   $ (812)