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Additional financial information - Other current liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Dividends payable $ 0 $ 750 $ 0
Construction contract liabilities 448 439 329
Insurance liability 162 171 176
Income tax payable 26 129 177
Other 786 583 676
Total other current liabilities $ 1,422 $ 2,072 $ 1,358