Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 29	$ 164
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	92	92
Amortization of deferred financing fees	3	3
Loss on disposal of assets and impairment charges	8	50
Other non-cash, net	0	(3)
Non-cash unit-based compensation expense	7	6
Deferred income tax	5	13
Inventory valuation adjustment	137	(97)
Equity in earnings of unconsolidated affiliate	(2)	0
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	129	(194)
Receivables from affiliates	6	35
Inventories	(1)	53
Other assets	36	31
Accounts payable	(155)	124
Accounts payable to affiliates	(33)	(68)
Accrued expenses and other current liabilities	23	8
Other noncurrent liabilities	(19)	(7)
Net cash provided by operating activities	255	184
Cash flows from investing activities:
Capital expenditures	(59)	(57)
Contributions to unconsolidated affiliate	(5)	0
Distributions from unconsolidated affiliate in excess of cumulative earnings	4	0
Proceeds from disposal of property and equipment	3	22
Net cash used in investing activities	(57)	(35)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	0	600
Payments on long-term debt	(6)	(4)
Revolver borrowings	663	1,064
Revolver repayments	(667)	(1,647)
Loan origination costs	0	(6)
Advances from (to) affiliates	0	1
Distributions to unitholders	(176)	(175)
Net cash used in financing activities	(186)	(169)
Net increase (decrease) in cash and cash equivalents	12	(20)
Cash and cash equivalents at beginning of period	21	56
Cash and cash equivalents at end of period	33	36
Supplemental disclosure of non-cash investing activities:
Change in note payable to affiliate	$ 11	$ 0