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Investments and Noncontrolling Interests (Summary of Equity Method Investment Financial Information) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule of Equity Method Investments    
Equity method investments $ 4,343 $ 3,743
L&S    
Schedule of Equity Method Investments    
Equity method investments $ 1,925 1,832
L&S | Andeavor Logistics Rio Pipeline LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 67.00%  
Equity method investments $ 168 171
L&S | Illinois Extension Pipeline Company, L.L.C.    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 35.00%  
Equity method investments $ 236 228
L&S | LOOP LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 41.00%  
Equity method investments $ 316 314
L&S | MarEn Bakken Company LLC(1)    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 25.00%  
Equity method investments [1] $ 535 449
L&S | Minnesota Pipe Line Company, LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 17.00%  
Equity method investments $ 173 174
L&S | Whistler Pipeline LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 38.00%  
Equity method investments $ 206 214
L&S | Other VIEs and Non-VIEs    
Schedule of Equity Method Investments    
Equity method investments [2] $ 291 282
L&S | Indirect Ownership Interest [Member] | Bakken Pipeline System [Member]    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 9.19%  
G&P    
Schedule of Equity Method Investments    
Equity method investments $ 2,418 1,911
G&P | Centrahoma Processing LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 40.00%  
Equity method investments $ 111 114
G&P | MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 67.00%  
Equity method investments $ 339 336
G&P | MarkWest Utica EMG, L.L.C.    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 58.00%  
Equity method investments $ 692 676
G&P | Ohio Gathering Company L.L.C.    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 36.00%  
Equity method investments $ 503 [3] 0
G&P | Rendezvous Gas Services, L.L.C.    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 78.00%  
Equity method investments $ 127 129
G&P | Sherwood Midstream Holdings LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 51.00%  
Equity method investments $ 110 113
G&P | Sherwood Midstream LLC    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 50.00%  
Equity method investments $ 496 500
G&P | Other VIEs and Non-VIEs    
Schedule of Equity Method Investments    
Equity method investments $ 40 $ 43
G&P | Indirect Ownership Interest [Member] | Ohio Gathering Company L.L.C.    
Schedule of Equity Method Investments    
Equity method investment, ownership percentage 37.00%  
[1] The investment in MarEn Bakken Company LLC includes our 9.19 percent indirect interest in a joint venture (“Dakota Access”) that owns and operates the Dakota Access Pipeline and Energy Transfer Crude Oil Pipeline projects, collectively referred to as the Bakken Pipeline system.
[2] Some investments included within Other have also been deemed to be VIEs.
[3] We acquired a 36 percent direct interest in OGC in the Utica Midstream Acquisition discussed in Note 3. We also hold a 37 percent indirect interest in OGC through our ownership interest in MarkWest Utica EMG, L.L.C.