Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Voluntary Separation Program	$ 7	$ 61
Postretirement obligation	280	269
Other deferred compensation	412	358
Other	234	293
Other noncurrent liabilities	933	$ 981
Payment of bonus and incentive pay as a ratification of the labor contract agreement	$ 1,900