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Acquisitions and Related Transactions Acquisitions (Current Transactions) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 02, 2021
Dec. 05, 2019
Feb. 28, 2021
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]              
Preferred Units, Issued       72,184,780   72,184,780 0
Long-term Debt, Fair Value       $ 54,970   $ 54,970 $ 56,210
Goodwill           $ 142 $ 9
Enable              
Business Acquisition [Line Items]              
Senior Notes $ 3,180            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares     0.8595        
Total consideration 3,458   $ 10        
Long-term Debt, Fair Value 3,430            
Goodwill $ 138     $ 138      
Enable | Series G Preferred Units [Member]              
Business Acquisition [Line Items]              
Preferred Units, Issued 384,780            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares     0.0265        
Enable | Enable 2019 Term Loan Agreement              
Business Acquisition [Line Items]              
Line of Credit Facility, Current Borrowing Capacity $ 800            
Enable | Enable Five-Year Revolving Credit Facility              
Business Acquisition [Line Items]              
Line of Credit Facility, Current Borrowing Capacity $ 35            
SemGroup [Member]              
Business Acquisition [Line Items]              
Goodwill   $ 295     $ 265