Investments in Unconsolidated Entities - Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Jul. 31, 2025	Jun. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Investments in Unconsolidated Entities [Line Items]
Investments in unconsolidated entities	$ 2,846			$ 2,811	$ 2,820
BridgeTex Pipeline Company, LLC (“BridgeTex”)
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	40.00%	40.00%	20.00%
Investments in unconsolidated entities	$ 574			403
Capline Pipeline Company LLC (“Capline”)
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	54.00%
Investments in unconsolidated entities	$ 473			501
Diamond Pipeline LLC
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	50.00%
Investments in unconsolidated entities	$ 432			440
Eagle Ford Pipeline LLC
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	50.00%
Investments in unconsolidated entities	$ 347			364
Eagle Ford Terminals Corpus Christi LLC
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	50.00%
Investments in unconsolidated entities	$ 110			113
Saddlehorn Pipeline Company, LLC (“Saddlehorn”)
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	40.00%
Investments in unconsolidated entities	$ 262			275
White Cliffs Pipeline, L.L.C.
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	36.00%
Investments in unconsolidated entities	$ 109			123
Wink to Webster Pipeline LLC (“W2W Pipeline”)
Investments in Unconsolidated Entities [Line Items]
Ownership interest in unconsolidated entity (as a percent)	17.00%
Investments in unconsolidated entities	$ 383			393
Other investments
Investments in Unconsolidated Entities [Line Items]
Investments in unconsolidated entities	$ 156			$ 199