UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income	$ 423	$ 402
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	39	36
Amortization of contract assets - related parties	8	0
Loss from revision of asset retirement obligation	0	2
Allowance oil reduction to net realizable value	8	1
Non-cash interest expense	0	1
Undistributed equity earnings	(6)	(5)
Changes in operating assets and liabilities
Accounts receivable	(10)	4
Allowance oil	(3)	(1)
Prepaid expenses and other assets	6	14
Accounts payable	11	0
Deferred revenue and other unearned income	20	(11)
Accrued liabilities	7	15
Net cash provided by operating activities	503	458
Cash flows from investing activities
Capital expenditures	(17)	(31)
Acquisitions from Parent	0	(90)
Contributions to investment	0	(13)
Return of investment	62	56
Net cash provided by (used in) investing activities	45	(78)
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	(12)	(13)
Distributions to unitholders and general partner	(497)	(379)
Other contributions from Parent	1	9
Receipt of principal payments on financing receivables	2	0
Repayment of principal on finance leases	(1)	(1)
Net cash used in financing activities	(509)	(294)
Net increase in cash and cash equivalents	39	86
Cash and cash equivalents at beginning of the period	290	208
Cash and cash equivalents at end of the period	329	294
Non-cash investing and financing transactions:
Change in accrued capital expenditures	$ 3	$ (2)