Investments in Unconsolidated Affiliates - Schedule of Equity in Income of Unconsolidated Affiliates by Business Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated affiliates	$ 109	$ 92	$ 185	$ 186
NGL Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated affiliates	21	18	40	38
Crude Oil Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated affiliates	86	72	140	144
Natural Gas Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated affiliates	1	0	3	2
Petrochemical & Refined Products Services
Schedule of Equity Method Investments [Line Items]
Equity in income of unconsolidated affiliates	$ 1	$ 2	$ 2	$ 2