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Shareholders' equity and share-based payments - TOTAL Option plans (Details)
12 Months Ended
May 29, 2020
Sep. 14, 2019
EquityInstruments
Sep. 14, 2018
EquityInstruments
Sep. 14, 2011
€ / shares
Sep. 14, 2010
€ / shares
Dec. 31, 2020
Dec. 31, 2019
EquityInstruments
€ / shares
Dec. 31, 2018
EquityInstruments
€ / shares
Share-based payments                
Weighted average exercise price as of the beginning of the year (in euros) | € / shares             € 33.00 € 37.15
Weighted average exercise price cancelled (in euros) | € / shares             33.00 38.20
Weighted average exercise price exercised (in euros) | € / shares             € 33.00 37.64
Weighted average exercise price as of the end of the year (in euros) | € / shares               € 33.00
Period of authorisation to grant share subscription or purchase options 38 months              
TOTAL share subscription or purchase option plans                
Share-based payments                
Existing options as of the beginning of the year             265,230 2,440,940
Cancelled (in shares)             (1,000) (79,139)
Exercised (in shares)             (264,230) (2,096,571)
Existing options as of the end of the year               265,230
Vesting period           2 years    
Expiry period           8 years    
TOTAL share subscription or purchase option plans | French subsidiaries                
Share-based payments                
Transfer restriction period           4 years    
TOTAL share subscription or purchase option plans | Non-French subsidiaries                
Share-based payments                
Transfer restriction period           2 years    
TOTAL share subscription or purchase option plans - 2010 Plan                
Share-based payments                
Strike price or weighted average exercise price | € / shares         € 38.20      
Existing options as of the beginning of the year               1,950,372
Cancelled (in shares)     79,139         (79,139)
Exercised (in shares)               (1,871,233)
TOTAL share subscription or purchase option plans - 2011 Plan                
Share-based payments                
Strike price or weighted average exercise price | € / shares       € 33.00        
Existing options as of the beginning of the year             265,230 490,568
Cancelled (in shares)   1,000         (1,000)  
Exercised (in shares)             (264,230) (225,338)
Existing options as of the end of the year               265,230