UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net income	$ 142	$ 137
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	13	12
Loss from revision of asset retirement obligation	0	2
Allowance oil reduction to net realizable value	8	0
Undistributed equity earnings	0	(3)
Changes in operating assets and liabilities
Accounts receivable	(3)	5
Allowance oil	0	2
Prepaid expenses and other assets	3	4
Accounts payable	(3)	(1)
Deferred revenue and other unearned income	2	(8)
Net cash provided by operating activities	162	150
Cash flows from investing activities
Capital expenditures	(7)	(10)
Contributions to investment	0	(5)
Return of investment	14	8
Net cash provided by (used in) investing activities	7	(7)
Cash flows from financing activities
Distributions to noncontrolling interests	(5)	(3)
Distributions to unitholders and general partner	(162)	(129)
Other contributions from Parent	0	7
Net cash used in financing activities	(167)	(125)
Net increase in cash and cash equivalents	2	18
Cash and cash equivalents at beginning of the period	290	208
Cash and cash equivalents at end of the period	292	226
Non-cash investing and financing transactions:
Change in accrued capital expenditures	$ (4)	$ 2