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Hedging Activities and Fair Value Measurements - Schedule of Unrealized Mark-to-Market Gains (Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative [Line Items] |  |  |
Total mark-to-market impact on gross operating margin | $ (16) | $ 20 | $ (33)
NGL Pipelines & Services |  |  |
Derivative [Line Items] |  |  |
Total mark-to-market impact on gross operating margin | (3) | (8) | (25)
Crude Oil Pipelines & Services |  |  |
Derivative [Line Items] |  |  |
Total mark-to-market impact on gross operating margin | (4) | 21 | (5)
Natural Gas Pipelines & Services |  |  |
Derivative [Line Items] |  |  |
Total mark-to-market impact on gross operating margin | (10) | 5 | (1)
Petrochemical & Refined Products Services |  |  |
Derivative [Line Items] |  |  |
Total mark-to-market impact on gross operating margin | $ 1 | $ 2 | $ (2)

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