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Impairment review of tangible and intangible assets and right-of-use assets - Additional Information (Details)
€ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
$ / bbl
Mar. 31, 2020
$ / bbl
Aug. 31, 2020
$ / bbl
Mar. 31, 2021
$ / bbl
Dec. 31, 2040
$ / t
Dec. 31, 2022
$ / MMBTU
$ / bbl
Dec. 31, 2021
$ / bbl
Dec. 31, 2020
EUR (€)
$ / bbl
Dec. 31, 2023
$ / MMBTU
Dec. 31, 2019
$ / bbl
Impairment review of tangible and intangible assets and right-of-use assets                    
Brent price per bbl | $ / bbl 50 15 45 60            
Long-term Brent price (in 2023 real terms) | $ / bbl 60             60   70
Post-tax weighted-average cost of capital 6.70%             6.70%   7.40%
Percentage of CGUs for which impairment test performed               100.00%    
Forecast                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Brent price per bbl | $ / bbl           55 50      
Long-term Brent price (in 2023 real terms) | $ / bbl 60             60   70
Projection of purchase cost of emission allowances of the "advanced" economies (in 2019 currency per ton) | $ / t         140          
Italy | Forecast                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Italian spot gas benchmark reference price | $ / MMBTU           7.8     5.5  
Exploration & Production                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               € 1,888    
Reduction in headroom observed (4.60%)             (4.60%)    
Loss in value-in-use of the CGU in base case scenario (11.00%)             (11.00%)    
Loss in value-in-use of the CGU, otherwise (5.00%)             (5.00%)    
Exploration & Production | Minimum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Pre-tax weighted-average cost of capital 6.00%             6.00%    
Exploration & Production | Maximum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Pre-tax weighted-average cost of capital 14.00%             14.00%    
Exploration & Production | Italy                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               € 566    
Exploration & Production | Italy | Minimum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Post-tax weighted-average cost of capital 6.00%             6.00%    
Exploration & Production | Algeria                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               € 409    
Exploration & Production | Congo                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               306    
Exploration & Production | USA                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               € 232    
Exploration & Production | USA | Minimum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Post-tax weighted-average cost of capital 6.00%             6.00%    
Exploration & Production | Turkmenistan                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Impairment losses               € 202    
Exploration & Production | Other countries | Minimum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Post-tax weighted-average cost of capital 7.00%             7.00%    
Exploration & Production | Other countries | Maximum                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Post-tax weighted-average cost of capital 8.00%             8.00%    
Refining & Marketing                    
Impairment review of tangible and intangible assets and right-of-use assets                    
Post-tax weighted-average cost of capital 6.30%             6.30%    
Impairment losses               € 1,225    
Pre-tax weighted-average cost of capital 6.30%             6.30%