Segment Information - Schedule of Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Selected Information [Line Items]
Operating Revenues and Other	$ 6,123	$ 6,044
Operating Income (Loss)	2,271	2,572
Other Income, Net	62	65
Interest Expense, Net	(33)	(42)
Income Before Income Taxes	2,300	2,595
United States
Selected Information [Line Items]
Operating Revenues and Other	6,060	5,941
Operating Income (Loss)	2,264	2,512
Trinidad
Selected Information [Line Items]
Operating Revenues and Other	63	103
Operating Income (Loss)	16	66
Other International
Selected Information [Line Items]
Operating Revenues and Other	0	0
Operating Income (Loss)	$ (9)	$ (6)