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Intangible and tangible assets - Changes in carrying amount of goodwill (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period $ 8,346
Increases 418
Other 43
Net goodwill as of the end of the period 8,807
Effect of changes in the consolidation scope 345
Exploration & Production  
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period 2,642
Other (4)
Net goodwill as of the end of the period 2,638
Integrated Gas, Renewables and Power  
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period 4,774
Increases 401
Other 72
Net goodwill as of the end of the period 5,247
Refining & Chemicals  
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period 523
Increases 17
Other (6)
Net goodwill as of the end of the period 534
Marketing & Services  
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period 379
Other (22)
Net goodwill as of the end of the period 357
Corporate  
Changes in the carrying amount of goodwill by business segment  
Net goodwill as of the beginning of the period 28
Other 3
Net goodwill as of the end of the period $ 31