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Financial instruments - additional disclosures (Details 8) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Maturity of net debt [line items]    
Current financial assets $ 11,563 $ 11,446
Non-current financial debts (26,259) (20,353)
Current financial debt (9,785) (7,031)
Net debt (24,481) (15,938)
Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 1,635 122
Commodities [member]    
Maturity of net debt [line items]    
Current financial assets 111 110
Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 159 102
Cash and cash equivalents [member]    
Maturity of net debt [line items]    
Current financial assets 9,658 11,112
Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (26,259) (20,353)
Current financial debt (9,591) (6,846)
Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts (26,463) (20,505)
Current financial debt (9,593) (6,846)
Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (194) (185)
Not later than one month [member]    
Maturity of net debt [line items]    
Current financial assets 8,609 9,746
Current financial debt (4,288) (4,373)
Net debt 4,321 5,373
Not later than one month [member] | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 13 20
Not later than one month [member] | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 38 14
Not later than one month [member] | Cash and cash equivalents [member]    
Maturity of net debt [line items]    
Current financial assets 8,558 9,712
Not later than one month [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (4,195) (4,243)
Not later than one month [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (4,195) (4,243)
Not later than one month [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (93) (130)
Later than one month and not later than three months [member]    
Maturity of net debt [line items]    
Current financial assets 2,781 1,505
Current financial debt (2,302) (1,402)
Net debt 479 103
Later than one month and not later than three months [member] | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 1,571 26
Later than one month and not later than three months [member] | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 110 79
Later than one month and not later than three months [member] | Cash and cash equivalents [member]    
Maturity of net debt [line items]    
Current financial assets 1,100 1,400
Later than one month and not later than three months [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (2,218) (1,373)
Later than one month and not later than three months [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (2,219) (1,373)
Later than one month and not later than three months [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (84) (29)
Later than three month and not later than twelve months [member]    
Maturity of net debt [line items]    
Current financial assets 29 19
Current financial debt (3,195) (1,256)
Net debt (3,166) (1,237)
Later than three month and not later than twelve months [member] | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 25 16
Later than three month and not later than twelve months [member] | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 4 3
Later than three month and not later than twelve months [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (3,178) (1,230)
Later than three month and not later than twelve months [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (3,179) (1,230)
Later than three month and not later than twelve months [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (17) (26)
Between one and five years    
Maturity of net debt [line items]    
Current financial assets 9 6
Non-current financial debts (10,621) (9,110)
Net debt (10,612) (9,104)
Between one and five years | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 5 3
Between one and five years | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 4 3
Between one and five years | Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (10,621) (9,110)
Between one and five years | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts (10,661) (9,150)
Later than five years    
Maturity of net debt [line items]    
Current financial assets 135 170
Non-current financial debts (15,638) (11,243)
Net debt (15,503) (11,073)
Later than five years | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 21 57
Later than five years | Commodities [member]    
Maturity of net debt [line items]    
Current financial assets 111 110
Later than five years | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 3 3
Later than five years | Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (15,638) (11,243)
Later than five years | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts $ (15,802) $ (11,355)