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Equity (Quarterly Distributions Of Available Cash) (Details) - $ / shares
 3 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Parent Company [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.1525 $ 0.1525 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 [1]        
USAC [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250 0.5250          
Sunoco LP [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.8255 0.8255 0.8255 0.8255 $ 0.8255 0.8255 0.8255 0.8255 0.8255 0.8255 0.8255 0.8255 0.8255        
Series A Convertible Preferred Units [Member] | Parent Company [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit                       $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100
Minimum Quarterly Distribution [Member]                                  
Distribution Payment Targets         $0.4375                        
First Target Distribution [Member]                                  
Distribution Payment Targets         $0.4375 to $0.503125                        
Second Target Distribution [Member]                                  
Distribution Payment Targets         $0.503125 to $0.546875                        
Third Target Distribution [Member]                                  
Distribution Payment Targets         $0.546875 to $0.656250                        
Thereafter [Member]                                  
Distribution Payment Targets         Above $0.656250                        
IDRs [Member] | Minimum Quarterly Distribution [Member]                                  
Distribution Payment Targets         —%                        
IDRs [Member] | First Target Distribution [Member]                                  
Distribution Payment Targets         —%                        
IDRs [Member] | Second Target Distribution [Member]                                  
Distribution Payment Targets         15%                        
IDRs [Member] | Third Target Distribution [Member]                                  
Distribution Payment Targets         25%                        
IDRs [Member] | Thereafter [Member]                                  
Distribution Payment Targets         50%                        
Limited Partner [Member] | Minimum Quarterly Distribution [Member]                                  
Distribution Payment Targets         100%                        
Limited Partner [Member] | First Target Distribution [Member]                                  
Distribution Payment Targets         100%                        
Limited Partner [Member] | Second Target Distribution [Member]                                  
Distribution Payment Targets         85%                        
Limited Partner [Member] | Third Target Distribution [Member]                                  
Distribution Payment Targets         75%                        
Limited Partner [Member] | Thereafter [Member]                                  
Distribution Payment Targets         50%                        
Series A Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 31.2500 [2] 0 [2] 31.2500 [2] 0 [2] $ 31.2500 [2] 0 [2] 31.2500 [2] 0 [2] 31.2500 [2] 0 31.2500 [2]            
Series B Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 33.1250 [2] 0 [2] 33.1250 [2] 0 [2] 33.1250 [2] 0 [2] 33.1250 [2] 0 [2] 33.1250 [2] 0 33.1250 [2]            
Series C Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.4609 0.4609 0.4609 0.4609 0.4609 0.4609 0.4609 0.4609 0.4609 0.4609 0.5634 [3]            
Series D Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.4766 0.4766 0.4766 0.4766 0.4766 0.4766 0.4766 0.4766 0.4766 0.5931 [3] 0            
Series E Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.4750 0.4750 0.4750 0.4750 0.4750 0.4750 0.5806 [3] 0 0 0 0            
Series F Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit [2] 0 33.75 0 21.19 [3] 0 0 0 0 0 0 0            
Series G Preferred Units [Member]                                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit [2] $ 0 $ 35.625 $ 0 $ 22.36 [3] $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0            
[1] Certain common unitholders elected to participate in a plan pursuant to which those unitholders elected to forego their cash distributions on all or a portion of their common units for a period of up to nine quarters commencing with the distribution for the quarter ended March 31, 2016 and, in lieu of receiving cash distributions on these common units for each such quarter, each said unitholder received ET Series A Convertible Preferred Units (on a one-for-one basis for each common unit as to which the participating unitholder elected be subject to this plan) that entitled them to receive a cash distribution of up to $0.11 per unit. See additional information below.
[2] (1)    ETO Series A Preferred Unit, ETO Series B Preferred Unit, ETO Series F Preferred Unit and ETO Series G Preferred Unit distributions are paid on a semi-annual basis.
[3] *    Represent prorated initial distributions.