UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net income	$ 167	$ 142
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	13	13
Amortization of contract assets - related parties	4	0
Impairment charge	3	0
Allowance oil reduction to net realizable value	0	8
Undistributed equity earnings	(5)	0
Changes in operating assets and liabilities
Accounts receivable	(4)	(3)
Allowance oil	(5)	0
Prepaid expenses and other assets	8	3
Accounts payable	(5)	(3)
Deferred revenue and other unearned income	0	2
Accrued liabilities	(10)	0
Net cash provided by operating activities	166	162
Cash flows from investing activities
Capital expenditures	(1)	(7)
Contributions to investment	(2)	0
Return of investment	12	14
Net cash provided by investing activities	9	7
Cash flows from financing activities
Distributions to noncontrolling interests	(4)	(5)
Distributions to unitholders and general partner	(173)	(162)
Prepayment fee on credit facility	(2)	0
Receipt of principal payments on financing receivables	1	0
Net cash used in financing activities	(178)	(167)
Net increase in cash and cash equivalents	(3)	2
Cash and cash equivalents at beginning of the period	320	290
Cash and cash equivalents at end of the period	317	292
Non-cash investing and financing transactions:
Change in accrued capital expenditures	$ 1	$ (4)