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Reportable Segments (Operating Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: $ 5,097 $ 4,315 $ 4,248
Intersegment Eliminations [Member]      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: (112) (112) (170)
Intrastate Transportation and Storage | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 246 279 334
Interstate Transportation and Storage | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 807 746 791
Midstream | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 1,550 1,204 1,087
NGL and Refined Products Transportation and Services | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 957 892 962
Crude Oil Transportation and Services | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 852 699 645
Investment in Sunoco LP | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 611 420 396
Investment in USAC | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: 166 147 123
Corporate Segment and Other Operating Segment [Member] | Operating Segments      
Segment Reporting Information [Line Items]      
Operating expenses, excluding non-cash compensation, amortization, accretion and other non-cash expenses: $ 20 $ 40 $ 80