UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 286	$ 256
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	26	24
Amortization of contract assets - related parties	4	0
Loss from revision of asset retirement obligation	0	2
Allowance oil reduction to net realizable value	8	0
Undistributed equity earnings	(1)	(3)
Changes in operating assets and liabilities
Accounts receivable	(4)	(3)
Allowance oil	(1)	0
Prepaid expenses and other assets	10	10
Accounts payable	13	1
Deferred revenue and other unearned income	9	(11)
Accrued liabilities	4	7
Net cash provided by operating activities	354	283
Cash flows from investing activities
Capital expenditures	(9)	(24)
Acquisitions from Parent	0	(90)
Contributions to investment	0	(10)
Return of investment	32	47
Net cash provided by (used in) investing activities	23	(77)
Cash flows from financing activities
Payment of equity issuance costs	(2)	0
Borrowings under credit facilities	0	600
Capital distributions to general partner	0	(510)
Distributions to noncontrolling interests	(9)	(9)
Distributions to unitholders and general partner	(325)	(248)
Other contributions from Parent	0	10
Receipt of principal payments on financing receivables	1	0
Net cash used in financing activities	(335)	(157)
Net increase in cash and cash equivalents	42	49
Cash and cash equivalents at beginning of the period	290	208
Cash and cash equivalents at end of the period	332	257
Non-cash investing and financing transactions:
Change in accrued capital expenditures	0	(2)
Other non-cash contributions from Parent	$ 1	$ 0