Business Segments and Related Information - Schedule of Revenues and Costs and Expenses Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Consolidated Revenues [Abstract]
Revenues	$ 12,023	$ 13,775	$ 38,803	$ 42,018
Operating Costs and Expenses [Abstract]
Cost of sales	8,590	10,387	28,494	31,976
Other operating costs and expenses	1,120	1,018	3,243	2,946
Depreciation, amortization and accretion	643	601	1,886	1,791
Asset impairment charges	17	27	38	51
Net losses (gains) attributable to asset sales and related matters	(4)	0	(13)	5
General and administrative costs	61	61	189	184
Total costs and expenses	10,427	12,094	33,837	36,953
NGL Pipelines & Services
Consolidated Revenues [Abstract]
Revenues	3,465	4,831	12,271	14,236
Crude Oil Pipelines & Services
Consolidated Revenues [Abstract]
Revenues	5,396	5,251	15,300	16,554
Natural Gas Pipelines & Services
Consolidated Revenues [Abstract]
Revenues	932	649	3,224	2,115
Petrochemical & Refined Products Services
Consolidated Revenues [Abstract]
Revenues	$ 2,230	$ 3,044	$ 8,008	$ 9,113