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Asset retirement obligations - Schedule of Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]      
Accretion $ 12 $ 11 $ 12
Depreciation 27 46 42
Total costs $ 39 $ 57 $ 54