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Estimates, Significant Accounting Policies and Balance Sheet Detail (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 03, 2024
 [1]
Nov. 03, 2023
Apr. 01, 2022
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Impairment losses and other         $ 52 $ 12 $ 386
Asset Retirement Obligation       $ 418 418 410  
Oil and Gas, Cost Incurred, Asset Retirement Obligation         11 10 4
Long-term Debt, Fair Value       59,010 59,010 51,930  
Goodwill, Acquired During Period         16 1,455  
Goodwill       3,903 3,903 4,019 2,566
Long-term Debt       59,760 59,760 52,388  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net         0    
Inventory Write-down         86 114 5
Revenues         82,671 78,586 89,876
Goodwill, Written off Related to Sale of Business Unit         138    
Other (5 to 20 years)              
Asset Retirement Obligation       $ 31 31 31  
Related Party              
Revenues         $ 603 626 391
Minimum [Member] | Product storage and related facilities              
Property, plant and equipment, useful life, minimum (years)       2 years 2 years    
Maximum [Member] | Product storage and related facilities              
Property, plant and equipment, useful life, minimum (years)       83 years 83 years    
Midstream              
Goodwill, Acquired During Period         $ 0 601  
Goodwill       $ 617 617 601 0
Goodwill, Written off Related to Sale of Business Unit         0    
All Other              
Goodwill, Acquired During Period         0 0  
Goodwill       82 82 82 82
Goodwill, Written off Related to Sale of Business Unit         0    
Investment in Sunoco LP              
Goodwill, Acquired During Period         16 0  
Goodwill       1,477 1,477 1,599 1,601
Goodwill, Written off Related to Sale of Business Unit         138    
Retail Marketing [Member]              
Excise Taxes Collected         164 274 285
Interstate Transportation and Storage              
Goodwill, Acquired During Period         0 0  
Goodwill       0 0 0 0
Goodwill, Written off Related to Sale of Business Unit         0    
Investment in USAC              
Goodwill, Acquired During Period         0 0  
Goodwill       0 0 0 0
Goodwill, Written off Related to Sale of Business Unit         0    
Crude Oil Transportation and Services              
Goodwill, Acquired During Period         0 663  
Goodwill       841 841 853 190
Goodwill, Written off Related to Sale of Business Unit         0    
Intrastate Transportation and Storage              
Goodwill, Acquired During Period         0 0  
Goodwill       0 0 0 0
Goodwill, Written off Related to Sale of Business Unit         0    
NGL and Refined Products Transportation and Services              
Goodwill, Acquired During Period         0 191  
Goodwill       886 886 884 693
Goodwill, Written off Related to Sale of Business Unit         0    
Sunoco LP [Member]              
Goodwill, Acquired During Period     $ 20        
Long-term Debt       7,485 7,485 3,580  
Inventory, LIFO Reserve       316 316 230  
USAC [Member]              
Impairment losses and other         1 $ 12 $ 1
Crestwood Acquisition              
Goodwill, Acquired During Period   $ 1,455   $ 1,460      
Nustar Acquisition              
Goodwill, Acquired During Period $ 16       $ 16    
[1] Goodwill primarily represents expected commercial and operational synergies. None of the goodwill recorded as a result of this transaction is deductible for tax purposes.