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Financial structure and financial costs - Interest rate risk sensitivity (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sensitivity analysis      
Financial liabilities $ (137,786) $ (129,050) $ (115,381)
Financial assets 104,041 96,173 72,671
Fair value, financial liabilities (136,009) (132,686) (121,410)
Fair value, financial assets 104,041 96,173 72,671
Impact of changes in interest rates on the cost of net debt      
Cost of net debt (1,243) (1,525) (2,110)
Bonds (before swaps)      
Sensitivity analysis      
Financial liabilities (32,184) (39,256) (46,239)
Fair value, financial liabilities (30,391) (42,888) (52,246)
Swaps hedging bonds      
Sensitivity analysis      
Financial liabilities (3,746) (1,498) (1,615)
Financial assets 813 787 3,221
Carrying amount (2,933) (711) 1,606
Fair value, financial liabilities (3,746) (1,498) (1,615)
Fair value, financial assets 813 787 3,221
Estimated fair value (2,933) (711) 1,606
Current portion of non-current debt after swaps (excluding lease obligations)      
Sensitivity analysis      
Financial liabilities (5,328) (5,073) (4,674)
Fair value, financial liabilities (5,344) (5,077) (4,696)
Held for trading - Other interest rate swaps      
Sensitivity analysis      
Carrying amount 281 31 (73)
Estimated fair value 281 31 (73)
Held for trading - Currency swaps and forward exchange contracts      
Sensitivity analysis      
Carrying amount (68) 45 (6)
Estimated fair value $ (68) 45 (6)
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 $ 18 47 29
Impact on cost of net debt, interest rate decrease (18) (47) (29)
Interest rate risk | Bonds (before swaps)      
Sensitivity analysis      
Change in fair value due to interest rate increase 210 349 440
Change in fair value due to interest rate decrease (210) (349) (440)
Interest rate risk | Swaps hedging bonds      
Sensitivity analysis      
Change in fair value due to interest rate increase (9) (34) (70)
Change in fair value due to interest rate decrease 9 34 70
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 5 2
Change in fair value due to interest rate decrease (3) (5) (2)
Interest rate risk | Held for trading - Other interest rate swaps      
Sensitivity analysis      
Change in fair value due to interest rate increase 10 16 18
Change in fair value due to interest rate decrease $ (10) $ (16) $ (18)