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Events after reporting period (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of non-adjusting events after reporting period [line items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners   $ 151 $ 1,242
Classification of assets as held for sale [member] | Egypt      
Disclosure of non-adjusting events after reporting period [line items]      
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners   $ 1,400  
Formation of joint venture [Member] | Joint ventures | Egypt      
Disclosure of non-adjusting events after reporting period [line items]      
Proportion of ownership interest in joint venture 51.00%