Investments in Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates by Business Segment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,201	$ 2,259
NGL Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	573	598
Crude Oil Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	1,595	1,628
Natural Gas Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	31	30
Petrochemical & Refined Products Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2	$ 3