Partners' Capital and Distributions (Tables)

12 Months Ended

Dec. 31, 2020

Partners Capital and Distribution [Line Items]

Activity for preferred and common units

The following table presents the activity for our preferred and common units:

	Limited Partners
	Series A Preferred Units	Series B Preferred Units	Common Units
Outstanding at December 31, 2017	69,696,542	800,000	725,189,138
Issuances of Series A preferred units in connection with in-kind distributions	1,393,926	—	—
Issuances of common units under equity-indexed compensation plans	—	—	1,172,786
Outstanding at December 31, 2018	71,090,468	800,000	726,361,924
Issuances of common units under equity-indexed compensation plans	—	—	1,666,652
Outstanding at December 31, 2019	71,090,468	800,000	728,028,576
Repurchase and cancellation of common units under the Common Equity Repurchase Program	—	—	(6,222,748)
Issuances of common units under equity-indexed compensation plans	—	—	574,588
Outstanding at December 31, 2020	71,090,468	800,000	722,380,416

Series A Preferred Units

Partners Capital and Distribution [Line Items]

Schedule of distributions paid

The following table details distributions paid to our preferred unitholders during the year presented (in millions, except unit data):

	Series A Preferred Unitholders			Series B Preferred Unitholders
	Distribution (1)			Cash Distribution
Year	Cash		Units
2020	$	149	—	$	49
2019	$	149	—	$	49
2018	$	112	1,393,926	$	49

(1)We elected to pay distributions on our Series A preferred units in additional Series A preferred units for each quarterly distribution from their issuance through the February 2018 distribution. Distributions on our Series A preferred units have been paid in cash since the May 2018 distribution. During 2018, we issued additional Series A preferred units in lieu of cash distributions of $37 million.

Series B Preferred Units

Partners Capital and Distribution [Line Items]

Schedule of distributions paid

The following table details distributions paid to our preferred unitholders during the year presented (in millions, except unit data):

	Series A Preferred Unitholders			Series B Preferred Unitholders
	Distribution (1)			Cash Distribution
Year	Cash		Units
2020	$	149	—	$	49
2019	$	149	—	$	49
2018	$	112	1,393,926	$	49

(1)We elected to pay distributions on our Series A preferred units in additional Series A preferred units for each quarterly distribution from their issuance through the February 2018 distribution. Distributions on our Series A preferred units have been paid in cash since the May 2018 distribution. During 2018, we issued additional Series A preferred units in lieu of cash distributions of $37 million.

Common Units

Partners Capital and Distribution [Line Items]

Schedule of distributions paid

The following table details distributions paid to common unitholders during the year presented (in millions, except per unit data):

	Distributions Paid						Distributions per common unit
Year	Public		AAP		Total
2020	$	432	$	223	$	655	$	0.90
2019	$	632	$	372	$	1,004	$	1.38
2018	$	532	$	339	$	871	$	1.20