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Additional financial information - Noncurrent Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Income tax payable $ 712 $ 605
Asset retirement obligations 310 329
Pension liability 254 272
Insurance liability 260 265
Other 660 737
Total other noncurrent liabilities $ 2,196 $ 2,208