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Financial instruments and risk management - Corporate bonds and private placement debt (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
2030 USD corporate bond    
Measurement of fair values    
Financial liabilities $ 897 $ 995
Fair value of liability 810 836
2034 USD corporate bond    
Measurement of fair values    
Financial liabilities 641 628
Fair value of liability 672 642
2027 USD corporate bond    
Measurement of fair values    
Financial liabilities 349 348
Fair value of liability 354 352
2029 EUR corporate bond    
Measurement of fair values    
Financial liabilities 591 527
Fair value of liability 617 547
Private placement debt    
Measurement of fair values    
Financial liabilities 625 625
Fair value of liability $ 594 $ 573