Segment Information - Schedule of Selected Financial Information by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Selected Information [Line Items]
Operating Revenues and Other	$ 5,573	$ 7,407	$ 11,617	$ 11,390
Operating Income (Loss)	1,970	2,903	4,542	3,449
Other Income, Net	51	27	116	26
Interest Expense, Net	(35)	(48)	(77)	(96)
Income Before Income Taxes	1,986	2,882	4,581	3,379
Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	5,573	7,407	11,617	11,390
Operating Income (Loss)	1,970	2,903	4,542	3,449
Segment Reconciling Items
Selected Information [Line Items]
Other Income, Net	51	27	116	26
Interest Expense, Net	(35)	(48)	(77)	(96)
United States | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	5,520	7,338	11,461	11,252
Operating Income (Loss)	1,961	2,885	4,473	3,404
Trinidad | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	52	69	155	138
Operating Income (Loss)	16	25	82	59
Other International | Operating Segments
Selected Information [Line Items]
Operating Revenues and Other	1	0	1	0
Operating Income (Loss)	$ (7)	$ (7)	$ (13)	$ (14)