Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows provided by (used in) operating activities
Net (loss) income	$ (88)	$ 2,895	$ (163)	$ (234)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation, Depletion and Amortization	(110)	(52)	(113)	(115)
Non-cash asset impairments and accelerated depreciation	0	0	32	27
Non-cash reorganization items, net	0	(3,293)	0	0
Deferred tax (benefit) expense	(12)	156	12	(3)
Gain on dispositions (see Note 15)	0	0	44	0
Gain (Loss) on Disposition of Assets	(6)	(3)	(6)	1
Amortization of deferred financing fees	0	0	49	16
Loss on extinguishment of debt	0	0	0	(3)
Unrealized foreign currency (gains) losses	1	7	(2)	(3)
Unrealized losses (gains) on pension and postretirement benefit plan liabilities	5	0	(13)	(4)
Financing fees included in net loss	0	136	0	0
Other non-cash adjustments	(3)	(2)	(2)	(5)
Net change in assets and liabilities:
Accounts receivable	(136)	88	(24)	50
Inventories	(17)	19	31	10
Accounts and drafts payable	(20)	(28)	(1)	19
Income taxes payable	(3)	18	8	9
Other assets, current and non-current	(28)	7	15	(1)
Other liabilities, current and long-term	12	11	0	(39)
Net cash provided by (used in) operating activities	224	(173)	(23)	(153)
Interest Costs Capitalized	0	0	0	(1)
Cash flows (used in) provided by investing activities
Capital expenditures	(58)	(43)	(90)	(117)
Proceeds from the dispositions, net	0	0	49	0
Proceeds from Sale of Property, Plant, and Equipment	0	1	1	8
Net cash (used in) provided by investing activities	(58)	(42)	(40)	(110)
Cash flows used in financing activities
Net short-term debt (repayments) borrowings	(24)	(4)	10	21
Borrowings of long-term debt	118	2,313	540	1,429
Repayments of long-term debt	(130)	(2,261)	(468)	(1,251)
Long-term debt and credit facility financing fees	(2)	(136)	(1)	(25)
Net cash (used in) provided by financing activities	(38)	212	81	174
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1	0	(5)	8
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	129	(3)	13	(81)
Cash, cash equivalents and restricted cash at beginning of period	125	128	115	196
Cash, cash equivalents and restricted cash at end of period	254		128	115
Supplemental disclosures of cash flow information
Interest, net	22	71	318	302
Income taxes, net of cash refunds	10	10	17	13
Cash paid for reorganization items	0	188	0	0
Proceeds from rights offering	$ 0	$ 300	$ 0	$ 0