Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net income (loss)	$ (14)	$ 380
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	314	323
Deferred income taxes	1	(1)
Impairments of property, plant and equipment and goodwill	28	0
Net loss on sale/retirement of assets	17	5
Gain on extinguishment of debt	(5)	0
Equity in (earnings) losses of equity method affiliate, net	211	(12)
Return on investment in equity method affiliate	14	12
Equity-based compensation	10	13
Amortization of debt costs and discount	3	(1)
Changes in other assets and liabilities:
Accounts receivable, net	14	19
Accounts receivable—affiliated companies	13	(3)
Inventory	4	3
Gas imbalance assets	(3)	6
Other current assets	0	(2)
Other assets	4	8
Accounts payable	(47)	(108)
Accounts payable—affiliated companies	1	(2)
Gas imbalance liabilities	(5)	(5)
Other current liabilities	(14)	64
Other liabilities	(3)	(8)
Net cash provided by operating activities	543	691
Cash Flows from Investing Activities:
Capital expenditures	(152)	(353)
Proceeds from sale of assets	19	1
Proceeds from insurance	1	0
Return of investment in equity method affiliate	9	8
Other, net	3	(9)
Net cash used in investing activities	(120)	(353)
Cash Flows from Financing Activities:
Increase (decrease) in short-term debt	179	(467)
Proceeds from long-term debt, net of issuance costs	0	1,544
Repayment of long-term debt	(267)	(700)
Proceeds from Revolving Credit Facility	869	0
Repayment of Revolving Credit Facility	(869)	(250)
Distributions to common unitholders	(288)	(420)
Distributions to preferred unitholders	(27)	(27)
Distributions to non-controlling interests	(5)	(3)
Cash paid for employee equity-based compensation	(1)	(24)
Net cash used in financing activities	(409)	(347)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	14	(9)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	4	22
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 18	$ 13