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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
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)