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Financial structure and financial costs - Interest rate risk sensitivity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sensitivity analysis      
Financial liabilities $ (114,395) $ (111,786) $ (137,786)
Financial assets 83,240 84,725 104,041
Fair value, financial liabilities (114,755) (112,648) (136,009)
Fair value, financial assets 83,240 84,725 104,041
Impact of changes in interest rates on the cost of net debt      
Cost of net debt (1,230) (1,019) (1,243)
Bonds (before swaps)      
Sensitivity analysis      
Financial liabilities (31,434) (28,365) (32,184)
Fair value, financial liabilities (31,806) (29,216) (30,391)
Swaps hedging bonds      
Sensitivity analysis      
Financial liabilities (2,313) (2,198) (3,746)
Financial assets 546 673 813
Carrying amount (1,767) (1,525) (2,933)
Fair value, financial liabilities (2,313) (2,198) (3,746)
Fair value, financial assets 546 673 813
Estimated fair value (1,767) (1,525) (2,933)
Current portion of non-current debt after swaps (excluding lease obligations)      
Sensitivity analysis      
Financial liabilities (3,863) (5,669) (5,328)
Fair value, financial liabilities (3,851) (5,680) (5,344)
Held for trading - Other interest rate swaps      
Sensitivity analysis      
Carrying amount 91 240 281
Estimated fair value 91 240 281
Held for trading - Currency swaps and forward exchange contracts      
Sensitivity analysis      
Carrying amount 86 (29) (68)
Estimated fair value $ 86 (29) (68)
Interest rate risk      
Sensitivity analysis      
Reasonably possible increase in risk assumption (as a percent) 0.10%    
Reasonably possible decrease in risk assumption (as a percent) (0.10%)    
Impact of changes in interest rates on the cost of net debt      
Impact on cost of net debt, interest rate increase $ 15 10 18
Impact on cost of net debt, interest rate decrease (15) (10) (18)
Interest rate risk | Bonds (before swaps)      
Sensitivity analysis      
Change in fair value due to interest rate increase 291 162 210
Change in fair value due to interest rate decrease (291) (162) (210)
Interest rate risk | Swaps hedging bonds      
Sensitivity analysis      
Change in fair value due to interest rate increase (54) (12) (9)
Change in fair value due to interest rate decrease 54 12 9
Interest rate risk | Current portion of non-current debt after swaps (excluding lease obligations)      
Sensitivity analysis      
Change in fair value due to interest rate increase 3 (1) 3
Change in fair value due to interest rate decrease (3) (7) (3)
Interest rate risk | Held for trading - Other interest rate swaps      
Sensitivity analysis      
Change in fair value due to interest rate increase 3 17 10
Change in fair value due to interest rate decrease $ (3) $ (17) $ (10)