Investments in Unconsolidated Affiliates - Schedule of Investments in Unconsolidated Affiliates by Business Segment (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2,142	$ 2,185
NGL Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	563	572
Crude Oil Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	1,545	1,581
Natural Gas Pipelines & Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	32	31
Petrochemical & Refined Products Services
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 2	$ 1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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