Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
BASIC EARNINGS PER UNIT
Net income attributable to limited partners		$ 1,034.7	$ 1,214.7	$ 2,384.8	$ 2,475.2
Earnings allocated to phantom unit awards	[1]	(7.5)	(7.4)	(17.4)	(15.2)
Net income available to common unitholders		$ 1,027.2	$ 1,207.3	$ 2,367.4	$ 2,460.0
Basic weighted-average number of common units outstanding (in units)		2,185.9	2,189.1	2,187.4	2,188.1
Basic earnings per unit (in dollars per unit)		$ 0.47	$ 0.55	$ 1.08	$ 1.12
DILUTED EARNINGS PER UNIT
Net income attributable to limited partners		$ 1,034.7	$ 1,214.7	$ 2,384.8	$ 2,475.2
Diluted weighted-average number of units outstanding:
Distribution-bearing common units (in units)		2,185.9	2,189.1	2,187.4	2,188.1
Phantom units (in units)	[1]	16.0	13.5	15.6	13.0
Total (in units)		2,201.9	2,202.6	2,203.0	2,201.1
Diluted earnings per unit (in dollars per unit)		$ 0.47	$ 0.55	$ 1.08	$ 1.12

[1] Phantom units are considered participating securities for purposes of computing basic earnings per unit. See Note 13 for information regarding our phantom units.