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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)

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