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Earnings Per Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
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, 2019
Dec. 31, 2018
Dec. 31, 2017
BASIC EARNINGS PER UNIT                      
Net income attributable to limited partners $ 1,096.9 $ 1,019.2 $ 1,214.7 $ 1,260.5 $ 1,284.7 $ 1,313.2 $ 673.8 $ 900.7 $ 4,591.3 $ 4,172.4 $ 2,799.3
Earnings allocated to phantom unit awards [1]                 (27.7) (21.5) (15.9)
Net income available to common unitholders                 $ 4,563.6 $ 4,150.9 $ 2,783.4
Basic weighted-average number of common units outstanding (in units)                 2,188.6 2,176.5 2,145.0
Basic earnings per unit (in dollars per unit) $ 0.50 $ 0.46 $ 0.55 $ 0.57 $ 0.59 $ 0.60 $ 0.31 $ 0.41 $ 2.09 $ 1.91 $ 1.30
DILUTED EARNINGS PER UNIT                      
Net income attributable to limited partners $ 1,096.9 $ 1,019.2 $ 1,214.7 $ 1,260.5 $ 1,284.7 $ 1,313.2 $ 673.8 $ 900.7 $ 4,591.3 $ 4,172.4 $ 2,799.3
Diluted weighted-average number of units outstanding:                      
Distribution-bearing common units (in units)                 2,188.6 2,176.5 2,145.0
Phantom units (in units) [1]                 13.1 10.5 9.3
Total (in units)                 2,201.7 2,187.0 2,154.3
Diluted earnings per unit (in dollars per unit) $ 0.50 $ 0.46 $ 0.55 $ 0.57 $ 0.59 $ 0.60 $ 0.31 $ 0.41 $ 2.09 $ 1.91 $ 1.30
[1] Phantom units are considered participating securities for purposes of computing basic earnings per unit. See Note 13 for information regarding our phantom units.