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Additional financial information - Other Noncurrent Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Liabilities for unrecognized tax benefits $ 166 $ 167
Finance lease liabilities 289 312
Asset retirement obligations 239 242
Pension liabilities 236 235
Contract liabilities 349 341
Environmental remediation liabilities 57 54
Self-insurance reserves 93 62
Other 134 108
Total Other noncurrent liabilities $ 1,563 $ 1,521