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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Voluntary Separation Program $ 40 $ 61
Postretirement obligation 273 269
Other deferred compensation 358 358
Other 266 293
Other noncurrent liabilities $ 937 $ 981