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Subsequent Events (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Feb. 14, 2020
$ / shares
Jan. 21, 2020
Terminal
Dec. 31, 2019
$ / shares
Nov. 14, 2019
$ / shares
Aug. 14, 2019
$ / shares
May 15, 2019
$ / shares
Feb. 14, 2019
$ / shares
Dec. 31, 2018
$ / shares
Nov. 14, 2018
$ / shares
Aug. 14, 2018
$ / shares
May 15, 2018
$ / shares
Feb. 14, 2018
$ / shares
Dec. 31, 2017
$ / shares
Nov. 14, 2017
$ / shares
Aug. 14, 2017
$ / shares
May 15, 2017
$ / shares
Feb. 14, 2017
$ / shares
Subsequent Event [Line Items]                                    
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share) | $ / shares       $ 4.0350 $ 1.0200 $ 1.0125 $ 1.0050 $ 0.9975 $ 3.7925 $ 0.9775 $ 0.9575 $ 0.9375 $ 0.9200 $ 3.5225 $ 0.9050 $ 0.8900 $ 0.8725 $ 0.8550
Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Partners' Capital Account, Distribution Per Unit of Limited Partner Interest (in dollars per share) | $ / shares   $ 1.0275                                
Forecast [Member]                                    
Subsequent Event [Line Items]                                    
Stock Repurchase Program, Authorized Amount | $ $ 750                                  
Buckeye Partners, L.P. [Member] | Subsequent Event [Member]                                    
Subsequent Event [Line Items]                                    
Number Of Marine Terminals Agreed To Be Sold | Terminal     3                              
Buckeye Partners, L.P. [Member] | Forecast [Member]                                    
Subsequent Event [Line Items]                                    
Proceeds from Sale of Other Assets | $ $ 250