Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
BASIC EARNINGS PER COMMON UNIT
Net income attributable to common unitholders		$ 1,296	$ 1,341
Earnings allocated to phantom unit awards	[1]	(11)	(11)
Net income allocated to common unitholders		$ 1,285	$ 1,330
Basic weighted-average number of common units outstanding (in units)		2,178	2,183
Basic earnings per common unit (in dollars per unit)		$ 0.59	$ 0.61
DILUTED EARNINGS PER COMMON UNIT
Net income attributable to common unitholders		$ 1,296	$ 1,341
Net income attributable to preferred units		1	1
Net income attributable to limited partners		$ 1,297	$ 1,342
Diluted weighted-average number of units outstanding:
Distribution-bearing common units (in units)		2,178	2,183
Phantom units (in units)	[2]	19	17
Preferred units (in units)	[2]	2	3
Total (in units)		2,199	2,203
Diluted earnings per common unit (in dollars per unit)		$ 0.59	$ 0.61

[1] Phantom units are considered participating securities for purposes of computing basic earnings per unit. See Note 13 for information regarding our 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 13 for information regarding phantom unit awards.  See Note 8 for information regarding preferred units.