Investments in Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates by Business Segment (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,165	$ 2,185
NGL Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	564	572
Crude Oil Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	1,568	1,581
Natural Gas Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	31	31
Petrochemical & Refined Products Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2	$ 1