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Investments in Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates by Business Segment (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 2,221 | $ 2,259
NGL Pipelines & Services |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | 578 | 598
Crude Oil Pipelines & Services |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | 1,610 | 1,628
Natural Gas Pipelines & Services |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | 32 | 30
Petrochemical & Refined Products Services |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in unconsolidated affiliates | $ 1 | $ 3

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