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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Regulatory Matters, Commitments, Contingencies And Environemental Liabilities (Environmental Liabilities) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Environmental Remediation Obligations [Abstract]    
Current $ 42 $ 54
Non-current 235 228
Total environmental liabilities $ 277 $ 282
Site Contingency, Number of Sites Needing Remediation 32