CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY - USD ($) shares in Millions, $ in Millions	Total	Non-Controlling Interest	Accumulated Other Comprehensive Income (Loss)	[1]	Limited Partners Common units	Limited Partners Class B units	General Partner
Partners' Equity at beginning of period (in units) at Dec. 31, 2017					70.6	1.9
Partners' Equity at beginning of period at Dec. 31, 2017	$ 1,068	$ 105	$ 5		$ 824	$ 110	$ 24
Increase (Decrease) in Partners' Equity
Net income (loss)	(165)	17			$ (191)	13	(4)
Other comprehensive income	3		3
ATM equity issuances, net (in units)					0.7
ATM equity issuances, net	40				$ 39		1
Distributions	(247)	(14)			$ (210)	$ (15)	(8)
Partners' Equity at end of period (in units) at Dec. 31, 2018					71.3	1.9
Partners' Equity at end of period at Dec. 31, 2018	699	108	8		$ 462	$ 108	13
Increase (Decrease) in Partners' Equity
Net income (loss)	298	18			267	8	5
Other comprehensive income	(13)		(13)
Distributions	(224)	(22)			$ (185)	$ (13)	(4)
Partners' Equity at end of period (in units) at Dec. 31, 2019					71.3	1.9
Partners' Equity at end of period at Dec. 31, 2019	760	104	(5)		$ 544	$ 103	14
Increase (Decrease) in Partners' Equity
Net income (loss)	301	17			278	0	6
Other comprehensive income	(8)		(8)
Distributions	(220)	(23)			$ (185)	$ (8)	(4)
Partners' Equity at end of period (in units) at Dec. 31, 2020					71.3	1.9
Partners' Equity at end of period at Dec. 31, 2020	$ 833	$ 98	$ (13)		$ 637	$ 95	$ 16

[1] Gains / losses related to cash flow hedges reported in accumulated other comprehensive income (loss) (AOCI) and expected to be reclassified to net income in the next 12 months are estimated to be a loss of $9 million. This estimate assumes constant interest rates over time; however, the amounts reclassified will vary based on actual value of interest rates at the date of settlement.