UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 256	$ 180
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	24	23
Loss from revision of asset retirement obligation	2	0
Undistributed equity earnings	(3)	(2)
Changes in operating assets and liabilities
Accounts receivable	(3)	(4)
Allowance oil	0	(6)
Prepaid expenses and other assets	10	6
Accounts payable	1	1
Deferred revenue and other unearned income	(11)	(3)
Accrued liabilities	7	18
Net cash provided by operating activities	283	213
Cash flows from investing activities
Capital expenditures	(24)	(25)
Acquisitions from Parent	(90)	(482)
Contributions to investment	(10)	(14)
Return of investment	47	33
Net cash used in investing activities	(77)	(488)
Cash flows from financing activities
Net proceeds from equity offerings	0	973
Borrowings under credit facilities	600	1,220
Repayments of credit facilities	0	(973)
Contributions from general partner	0	20
Capital distributions to general partner	(510)	(738)
Distributions to noncontrolling interests	(9)	(7)
Distributions to unitholders and general partner	(248)	(189)
Other contributions from Parent	10	6
Net cash (used in) provided by financing activities	(157)	312
Net increase in cash and cash equivalents	49	37
Cash and cash equivalents at beginning of the period	208	138
Cash and cash equivalents at end of the period	257	175
Non-cash investing and financing transactions:
Change in accrued capital expenditures	(2)	1
Other non-cash contributions from Parent	$ 0	$ 2