CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income (loss)	$ 96	$ 171	$ (30)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	183	111	115
Noncash restructuring charges	20	0	0
Noncash postretirement gain	0	0	(4)
Net periodic pension cost (income)	(14)	(7)	6
Pension plan contributions	(42)	(43)	(32)
Amortization of debt issuance cost and discount	1	19	9
Extinguishment of New Market Tax Credit obligation	0	0	(7)
Equity award expense	12	8	1
(Gain) loss on sale or disposal of assets	2	(8)	3
Deferred taxes	(117)	0	(8)
Prepayment premium on Term Loan Facility	0	1	1
Changes in assets and liabilities:
Accounts receivable, net	44	11	(13)
Inventories	(7)	(12)	60
Prepaid expenses and other assets	5	4	6
Accounts payable	(34)	40	67
Accrued and other liabilities	(24)	(12)	(21)
Net cash provided by (used in) operating activities	125	283	153
Net Cash Provided by (Used in) Investing Activities [Abstract]
Proceeds from sale of assets	1	17	0
Capital expenditures	(105)	(73)	(40)
Grant proceeds from Maine Technology Institute	0	4	0
Net cash provided by (used in) investing activities	(104)	(52)	(40)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings on ABL Facility	428	442	186
Payments on ABL Facility	(428)	(507)	(233)
Payments on Term Loan Facility	0	(146)	(65)
Prepayment premium on Term Loan Facility	0	(1)	(1)
Principal payment on finance lease obligations	(1)	0	0
Acquisition of treasury stock	(3)	0	0
Debt issuance costs	(1)	0	0
Net cash provided by (used in) financing activities	(5)	(212)	(113)
Change in Cash and cash equivalents and restricted cash	16	19	0
Cash and cash equivalents and restricted cash at beginning of period	28	9	9
Cash and cash equivalents and restricted cash at end of period	44	28	9
Supplementary cash flow disclosures:
Total interest paid	2	16	30
Total income taxes paid	3	0	0
Noncash investing and financing activities:
Right of use assets recorded upon adoption of ASC 842	24	0	0
Right of use assets obtained in exchange for new finance lease liabilities	8	0	0
Right of use assets obtained in exchange for new capitalized operating lease liabilities	$ 2	$ 0	$ 0