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Subsequent Event(s) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Feb. 16, 2022
Jan. 19, 2022
Mar. 23, 2021
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Feb. 11, 2022
Subsequent Event [Line Items]                                        
Distributions per Limited Partner unit (in dollars per share)       $ 0.30000 $ 0.30000 $ 0.30000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.46000 $ 0.44500 $ 0.43000 $ 0.41500 $ 0.40000 $ 1.36 $ 1.84 $ 1.75  
Debt instrument term     5 years                                  
Subsequent Event                                        
Subsequent Event [Line Items]                                        
Borrowings repaid $ 150                                      
Debt instrument term 5 years                                      
Subsequent Event | Shell Pipeline Company L P | Take Private Proposal                                        
Subsequent Event [Line Items]                                        
Issued and outstanding affiliates per share value (in dollars per share)                                       $ 12.89
Subsequent Event | Cash Distribution                                        
Subsequent Event [Line Items]                                        
Distributions per Limited Partner unit (in dollars per share)   $ 0.3                                    
Subsequent Event | Preferred Unit Distribution                                        
Subsequent Event [Line Items]                                        
Distributions per Limited Partner unit (in dollars per share)   $ 0.2363