CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES:
Net income (loss)	$ 171	$ 589	$ 108
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization	116	112	122
Goodwill Impairment	0	12	0
Deferred income taxes	(3)	(13)	12
Amortization of deferred financing fees	(2)	(4)	(13)
Nonmonetary Transaction, Gain (Loss) Recognized on Transfer	0
Income tax expense (benefit)	(3)	(402)	49
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment		428	0
Other non-cash	9	13	8
Changes in operating assets and liabilities	(25)	(51)	31
Net cash flows provided by operating activities	266	230	268
INVESTING ACTIVITIES:
Capital expenditures	(84)	(101)	(70)
Net cash flows used in investing activities	(84)	(101)	(70)
FINANCING ACTIVITIES:
Distribution Made to Limited Partner, Cash Distributions Paid	0	(375)	(24)
Proceeds from Related Party Debt	262	759	497
Repayments of Related Party Debt	(444)	(383)	(252)
Repayments of Long-term Debt	0	(150)	(400)
Proceeds from (Payments for) Other Financing Activities	0	0	(1)
Net cash flows used in financing activities	(182)	(149)	(180)
NET CHANGE IN CASH AND CASH EQUIVALENTS	0	(20)	18
CASH AND CASH EQUIVALENTS, beginning of period	0	20	2
CASH AND CASH EQUIVALENTS, end of period	$ 0	$ 0	$ 20