Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 105	$ 123
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	104	105
Deferred income taxes	0	(1)
Impairments	28	0
Loss on sale/retirement of assets	1	1
Equity in earnings of equity method affiliate	(6)	(3)
Return on investment in equity method affiliate	6	3
Equity-based compensation	4	4
Changes in other assets and liabilities:
Accounts receivable, net	52	27
Accounts receivable—affiliated companies	8	2
Inventory	3	(1)
Gas imbalance assets	(1)	7
Other current assets	(6)	10
Other assets	1	5
Accounts payable	(59)	(55)
Accounts payable—affiliated companies	1	0
Gas imbalance liabilities	(2)	(7)
Other current liabilities	(35)	4
Other liabilities	(4)	(9)
Net cash provided by operating activities	200	215
Cash Flows from Investing Activities:
Capital expenditures	(54)	(143)
Return of investment in equity method affiliate	4	9
Other, net	2	(10)
Net cash used in investing activities	(48)	(144)
Cash Flows from Financing Activities:
(Decrease) increase in short-term debt	(45)	147
Proceeds from long-term debt, net of issuance costs	0	200
Repayments of long-term debt	250	0
Proceeds from Lines of Credit	340	0
Repayment of Revolving Credit Facility	(40)	(250)
Distributions to common unitholders	144	138
Distributions to preferred unitholders	(9)	(9)
Distributions to non-controlling interests	(3)	(1)
Cash paid for employee equity-based compensation	(1)	(23)
Net cash used in financing activities	(152)	(74)
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	(3)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	4	22
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 4	$ 19