Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating Activities
Net income	$ 102	$ 27
Loss from discontinued operations, net of tax	(1)	0
Income from continuing operations	103	27
Adjustments to reconcile income from continuing operations to net cash:
Depreciation, depletion and amortization	77	77
Share-based compensation expense	10	9
Deferred income taxes	4	(1)
Gain on asset dispositions	(12)	0
Income from equity method investments	(8)	(1)
Gain on deconsolidation of subsidiaries and consolidated joint ventures	(27)	0
(Increase) decrease in working capital, net of deconsolidation of subsidiaries and consolidated joint ventures:
Receivables	(54)	(63)
Income taxes receivable	(1)	0
Inventories	(17)	(19)
Other current assets	(1)	(6)
Payables	(18)	(32)
Accrued expenses	(22)	(31)
Decrease in other assets	0	2
Decrease in pension and postretirement benefits	0	(15)
Decrease in other liabilities	(7)	(1)
Other, net	(7)	9
Net cash provided by (used for) operating activities	20	(45)
Investing Activities
Purchases of marketable securities	(97)	(111)
Sales or maturities of marketable securities	99	104
Capital expenditures	(58)	(46)
Acquisition of mining rights	0	(17)
Net proceeds from asset dispositions	14	0
Investment in joint ventures, including $23 million of cash of contributed subsidiaries	(557)	(5)
Insurance proceeds	2
Return of restricted cash	4	0
Net cash used for investing activities	(593)	(75)
Financing Activities
Issuance of debt	3	3
Repayment of debt	(2)	(2)
Loans from joint venture partner	0	3
Issuance of common stock	3	2
Repurchases of common stock to satisfy employee tax withholding obligations	(5)	(9)
Net cash used for financing activities	(1)	(3)
Effect of exchange rate changes on cash	0	(7)
Net cash used for operating activities - discontinued operations	(1)	0
Net decrease in cash and cash equivalents	(575)	(130)
Cash and cash equivalents at beginning of period	810	546
Cash and cash equivalents at end of period	235	416
Supplemental Cash Flow Disclosures:
Interest paid, net of capitalized interest	86	96
Income taxes paid, net	8	3
Noncash Investing and Financing Activities:
Amount in accounts payable for capital expenditures	6	5
Noncash consideration to acquire interest in joint venture	121	0
Conversion of $75 million of 10% convertible senior notes due 2018, net of discount	(73)
Issuance of common stock upon conversion of debt	75
Accrued interest on debt conversion	$ (2)