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Capital structure and financing - C.3.4. Guarantees and pledged assets (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Disclosure of contingent liabilities [line items]    
Pledged deposits $ 0 $ 0
Bank and financing guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 629,000,000 232,000,000
Supplier guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 12,000,000 0
Within one year | Bank and financing guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 25,000,000 12,000,000
Within one year | Supplier guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 12,000,000 0
1-3 years | Bank and financing guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 271,000,000 220,000,000
1-3 years | Supplier guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 0 0
3-5 years | Bank and financing guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities 333,000,000 0
3-5 years | Supplier guarantees    
Disclosure of contingent liabilities [line items]    
Estimated financial effect of contingent liabilities $ 0 $ 0