Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
BASIC EARNINGS PER COMMON UNIT
Net income attributable to common unitholders		$ 4,634.1	$ 3,774.7	$ 4,591.3
Earnings allocated to phantom unit awards	[1]	(37.0)	(32.0)	(27.7)
Net income allocated to common unitholders		$ 4,597.1	$ 3,742.7	$ 4,563.6
Basic weighted-average number of common units outstanding (in units)		2,183.3	2,185.8	2,188.6
Basic earnings per common unit (in dollars per unit)		$ 2.11	$ 1.71	$ 2.09
DILUTED EARNINGS PER COMMON UNIT
Net income attributable to common unitholders		$ 4,634.1	$ 3,774.7	$ 4,591.3
Net income attributable to preferred units		3.6	0.9	0.0
Net income attributable to limited partners		$ 4,637.7	$ 3,775.6	$ 4,591.3
Diluted weighted-average number of units outstanding:
Distribution-bearing common units (in units)		2,183.3	2,185.8	2,188.6
Phantom units (in units)	[2]	17.5	15.7	13.1
Preferred units (in units)	[2]	2.5	0.7	0.0
Total (in units)		2,203.3	2,202.2	2,201.7
Diluted earnings per common unit (in dollars per unit)		$ 2.10	$ 1.71	$ 2.09

[1] Phantom units are considered participating securities for purposes of computing basic earnings per unit. See Note 12 for information regarding the phantom units. 

[2] We use the “if-converted method” to determine the potential dilutive effect of the vesting of phantom unit awards and the conversion of preferred units outstanding.  See Note 8 for information regarding preferred units.