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Financial instruments - additional disclosures (Details 7) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Maturity of net debt [line items]    
Current financial assets $ 18,930 $ 28,329
Non-current financial debts (20,244) (22,902)
Current financial debt (5,931) (6,295)
Net debt (7,245) (868)
Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 11,098 15,706
Commodities [member]    
Maturity of net debt [line items]    
Current financial assets 111 111
Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 204 105
Cash and cash equivalents [member]    
Maturity of net debt [line items]    
Current financial assets 7,517 12,407
Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (20,244) (22,902)
Current financial debt (5,876) (6,227)
Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts (20,396) (23,077)
Current financial debt (5,878) (6,229)
Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (55) (68)
Not later than one month [member]    
Maturity of net debt [line items]    
Current financial assets 8,176 7,438
Current financial debt (3,253) (2,830)
Net debt 4,923 4,608
Not later than one month [member] | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 4,142 11
Not later than one month [member] | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 23 21
Not later than one month [member] | Cash and cash equivalents [member]    
Maturity of net debt [line items]    
Current financial assets 4,011 7,406
Not later than one month [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (3,215) (2,780)
Not later than one month [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (3,215) (2,780)
Not later than one month [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (38) (50)
Later than one month and not later than three months [member]    
Maturity of net debt [line items]    
Current financial assets 10,564 19,650
Current financial debt (159) (537)
Net debt 10,405 19,113
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 6,911 14,585
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 147 64
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 3,506 5,001
Later than one month and not later than three months [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (146) (521)
Later than one month and not later than three months [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (146) (521)
Later than one month and not later than three months [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (13) (16)
Later than three month and not later than twelve months [member]    
Maturity of net debt [line items]    
Current financial assets 55 1,095
Current financial debt (2,519) (2,928)
Net debt (2,464) (1,833)
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 36 1,088
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 19 7
Later than three month and not later than twelve months [member] | Financial debt [member]    
Maturity of net debt [line items]    
Current financial debt (2,515) (2,926)
Later than three month and not later than twelve months [member] | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Current financial debt (2,517) (2,928)
Later than three month and not later than twelve months [member] | Derivative financial instruments [member]    
Maturity of net debt [line items]    
Current financial debt (4) (2)
Between one and five years    
Maturity of net debt [line items]    
Current financial assets   4
Non-current financial debts (8,975) (8,464)
Net debt (8,975) (8,460)
Between one and five years | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets   4
Between one and five years | Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (8,975) (8,464)
Between one and five years | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts (9,002) (8,490)
Later than five years    
Maturity of net debt [line items]    
Current financial assets 135 142
Non-current financial debts (11,269) (14,438)
Net debt (11,134) (14,296)
Later than five years | Marketable securities and time deposits [member]    
Maturity of net debt [line items]    
Current financial assets 9 18
Later than five years | Commodities [member]    
Maturity of net debt [line items]    
Current financial assets 111 111
Later than five years | Deriviative financial instruments and accrued interest [member]    
Maturity of net debt [line items]    
Current financial assets 15 13
Later than five years | Financial debt [member]    
Maturity of net debt [line items]    
Non-current financial debts (11,269) (14,438)
Later than five years | Financial debt - undiscounted [member]    
Maturity of net debt [line items]    
Non-current financial debts $ (11,394) $ (14,587)