Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities
Net income (loss)	$ 50	$ (113)
(Loss) income from discontinued operations	(1)	5
Income (loss) from continuing operations	51	(118)
Adjustments to reconcile income (loss) from continuing operations to net cash:
Depreciation, depletion and amortization	115	116
Loss on extinguishment of debt	0	41
Long-lived asset impairment charge	0	1
Share-based compensation expense	14	15
Deferred income taxes	(1)	4
Gain on asset dispositions	(1)	(8)
(Increase) decrease in working capital:
Receivables	(57)	(33)
Income taxes receivable	0	2
Inventories	(24)	(11)
Other current assets	(14)	2
Payables	(14)	17
Accrued expenses	(4)	25
Increase in other assets	0	3
Decrease in pension and postretirement benefits	(59)	(23)
Decrease in other liabilities	(4)	(6)
Other, net	10	0
Net cash provided by operating activities - continuing operations	12	27
Investing Activities
Purchases of marketable securities	(152)	(115)
Sales or maturities of marketable securities	144	269
Capital expenditures	(72)	(41)
Acquisition of mining rights	(17)	(16)
Net proceeds from asset dispositions	1	14
Investment in joint ventures	(5)	(14)
Loan to joint venture	0	(4)
Deposit of restricted cash	(1)	(16)
Net cash (used for) provided by investing activities - continuing operations	(102)	77
Financing Activities
Issuance of debt	7	248
Repayment of debt	(3)	(281)
Payment of debt issuance fees	0	(5)
Loans from joint venture partner	3	2
Issuance of common stock	3	1
Repurchases of common stock to satisfy employee tax withholding obligations	(9)	(5)
Net cash provided by (used for) financing activities - continuing operations	1	(40)
Effect of exchange rate changes on cash	(4)	5
Net cash (used for) provided by operating activities - discontinued operations	(1)	4
Net cash used for investing activities - discontinued operations	0	(1)
Net (decrease) increase in cash and cash equivalents	(94)	72
Cash and cash equivalents at beginning of period	546	365
Cash and cash equivalents at end of period	452	437
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	137	146
Income taxes paid, net	4	5
Amount in accounts payable for capital expenditures	$ 8	$ 2