CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income	$ 568	$ 556	$ 546
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	50	50	49
Amortization of contract assets - related parties	15	11	0
Loss from impairment of fixed assets and revision of ARO	3	0	2
Non-cash interest expense	1	1	1
Allowance oil reduction to net realizable value	0	8	1
Undistributed equity earnings	(5)	(4)	(6)
Changes in operating assets and liabilities
Accounts receivable	(15)	0	7
Allowance oil	(13)	(6)	0
Prepaid expenses and other assets	(1)	(7)	0
Accounts payable	1	7	2
Deferred revenue and other unearned income	10	24	(11)
Accrued liabilities	(2)	10	6
Net cash provided by operating activities	612	650	597
Cash flows from investing activities
Capital expenditures	(11)	(27)	(38)
Acquisitions from Parent	0	0	(90)
May 2021 Transaction	10	0	0
Contributions to investment	(4)	0	(25)
Return of investment	48	91	66
Auger Divestiture	2	0	0
Net cash provided by (used in) investing activities	45	64	(87)
Cash flows from financing activities
Payment of equity issuance costs	0	(2)	0
Borrowings under credit facilities	0	0	600
Capital distributions to general partner	0	0	(510)
Distributions to noncontrolling interests	(12)	(16)	(17)
Distributions to unitholders and general partner	(606)	(670)	(519)
Other contributions from Parent	0	2	19
Prepayment fee on credit facility	(2)	0	0
Receipt of principal payments on financing receivables	5	3	0
Repayment of principal on finance leases	(1)	(1)	(1)
Net cash used in financing activities	(616)	(684)	(428)
Net increase in cash and cash equivalents	41	30	82
Cash and cash equivalents at beginning of the period	320	290	208
Cash and cash equivalents at end of the period	361	320	290
Non-cash investing and financing transactions:
Change in accrued capital expenditures	$ 1	$ (5)	$ (3)