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Additional financial information - Other current liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Dividends payable $ 251 $ 0 $ 241
Construction contract liabilities 481 500 430
Insurance liability 190 185 159
Income tax payable 58 97 77
Other 980 795 828
Total other current liabilities $ 1,960 $ 1,577 $ 1,735