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Equity (Quarterly Distributions Of Available Cash) (Details) - $ / shares
 3 Months Ended
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
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Parent Company [Member]                          
Distribution Made to Limited Partner, Date of Record Feb. 08, 2019 Nov. 08, 2018 Aug. 06, 2018 May 07, 2018 Feb. 08, 2018 [1] Nov. 07, 2017 [1] Aug. 07, 2017 [1] May 10, 2017 [1] Feb. 07, 2017 [1] Nov. 07, 2016 [1] Aug. 08, 2016 [1] May 06, 2016 [1] Feb. 04, 2016 [1]
Distribution Made to Limited Partner, Distribution Date Feb. 19, 2019 Nov. 19, 2018 Aug. 20, 2018 May 21, 2018 Feb. 20, 2018 [1] Nov. 20, 2017 [1] Aug. 21, 2017 [1] May 19, 2017 [1] Feb. 21, 2017 [1] Nov. 18, 2016 [1] Aug. 19, 2016 [1] May 19, 2016 [1] Feb. 19, 2016 [1]
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 $ 0.3050 [1] $ 0.2950 [1] $ 0.2850 [1] $ 0.2850 [1] $ 0.2850 [1] $ 0.2850 [1] $ 0.2850 [1] $ 0.2850 [1] $ 0.2850 [1]
USAC [Member]                          
Distribution Made to Limited Partner, Date of Record Jan. 28, 2019 Oct. 29, 2018 Jul. 30, 2018 May 01, 2018                  
Distribution Made to Limited Partner, Distribution Date Feb. 08, 2019 Nov. 09, 2018 Aug. 10, 2018 May 11, 2018                  
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.5250 $ 0.5250 $ 0.5250 $ 0.5250                  
Sunoco LP [Member]                          
Distribution Made to Limited Partner, Date of Record Feb. 06, 2019 Nov. 06, 2018 Aug. 07, 2018 May 07, 2018 Feb. 06, 2018 Nov. 07, 2017 Aug. 07, 2017 May 09, 2017 Feb. 13, 2017 Nov. 07, 2016 Aug. 05, 2016 May 06, 2016 Feb. 05, 2016
Distribution Made to Limited Partner, Distribution Date Feb. 14, 2019 Nov. 14, 2018 Aug. 15, 2018 May 15, 2018 Feb. 14, 2018 Nov. 14, 2017 Aug. 15, 2017 May 16, 2017 Feb. 21, 2017 Nov. 15, 2016 Aug. 15, 2016 May 16, 2016 Feb. 16, 2016
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 $ 0.8173 $ 0.8013
Series A Convertible Preferred Units [Member] | Parent Company [Member]                          
Distribution Made to Limited Partner, Date of Record       May 07, 2018 Feb. 08, 2018 Nov. 07, 2017 Aug. 07, 2017 May 10, 2017 Feb. 07, 2017 Nov. 07, 2016 Aug. 08, 2016 May 06, 2016  
Distribution Made to Limited Partner, Distribution Date       May 21, 2018 Feb. 20, 2018 Nov. 20, 2017 Aug. 21, 2017 May 19, 2017 Feb. 21, 2017 Nov. 18, 2016 Aug. 19, 2016 May 19, 2016  
Distribution Made to Limited Partner, Distributions Paid, Per Unit       $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100 $ 0.1100  
Preferred Units [Member]                          
Distribution Made to Limited Partner, Date of Record Feb. 01, 2019 Nov. 01, 2018 Aug. 01, 2018   Feb. 01, 2018                
Distribution Made to Limited Partner, Distribution Date Feb. 15, 2019 Nov. 15, 2018 Aug. 15, 2018   Feb. 15, 2018                
Series A Preferred Units [Member]                          
Distribution Made to Limited Partner, Distributions Paid, Per Unit [2] $ 31.2500   $ 31.2500   $ 15.4510 [3]                
Series B Preferred Units [Member]                          
Distribution Made to Limited Partner, Distributions Paid, Per Unit [2] 33.1250   33.1250   $ 16.3780 [3]                
Series C Preferred Units [Member]                          
Distribution Made to Limited Partner, Distributions Paid, Per Unit 0.4609 $ 0.4609 0.5634 [3]                    
Series D Preferred Units [Member]                          
Distribution Made to Limited Partner, Distributions Paid, Per Unit $ 0.4766 $ 0.5931 [3] $ 0.0000                    
Minimum Quarterly Distribution [Member]                          
Distribution Payment Targets .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 0                        
IDRs [Member] | First Target Distribution [Member]                          
Distribution Payment Targets 0                        
IDRs [Member] | Second Target Distribution [Member]                          
Distribution Payment Targets 0.15                        
IDRs [Member] | Third Target Distribution [Member]                          
Distribution Payment Targets 0.25                        
IDRs [Member] | Thereafter [Member]                          
Distribution Payment Targets 0.5                        
Limited Partner [Member] | Minimum Quarterly Distribution [Member]                          
Distribution Payment Targets 1                        
Limited Partner [Member] | First Target Distribution [Member]                          
Distribution Payment Targets 1                        
Limited Partner [Member] | Second Target Distribution [Member]                          
Distribution Payment Targets 0.85                        
Limited Partner [Member] | Third Target Distribution [Member]                          
Distribution Payment Targets 0.75                        
Limited Partner [Member] | Thereafter [Member]                          
Distribution Payment Targets 0.5                        
[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 Convertible 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 Convertible Unit. See additional information below.
[2] Series A and Series B preferred unit distributions are paid on a bi-annual basis.
[3] Represent prorated initial distributions.