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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Net income (loss) $ (1,874) $ 974
Adjustments:    
Amortization 682 479
Stock based compensation and other non-cash benefits 38 36
Reclamation and remediation 36 32
Income from discontinued operations (74) 71
Write-downs 2,262 0
Impairment of marketable securities 11 32
Deferred income taxes (519) 12
Gain on asset sales, net (1) (10)
Other operating adjustments and write-downs 632 106
Net change in operating assets and liabilities (461) (768)
Net cash provided from continuing operations 732 964
Net cash used in discontinued operations (11) (8)
Net cash provided from operations 721 956
Investing activities:    
Additions to property, plant and mine development (1,120) (1,578)
Sale of marketable securities 1 106
Purchases of marketable securities (1) (196)
Acquisitions, net (13) (22)
Proceeds from sale of other assets 49 13
Other (21) (37)
Net cash used in investing activities (1,105) (1,714)
Financing activities:    
Proceeds from debt, net 987 3,343
Repayment of debt (534) (1,941)
Payment of conversion premium on debt   (172)
Sale of noncontrolling interests 32 0
Acquisition of noncontrolling interests (10) 0
Dividends paid to common stockholders (385) (347)
Dividends paid to noncontrolling interests (2) (3)
Proceeds from stock issuance, net 2 15
Other (3) (1)
Net cash provided from (used in) financing activities 87 894
Effect of exchange rate changes on cash (16) 1
Net change in cash and cash equivalents (313) 137
Cash and cash equivalents at beginning of period 1,561 1,760
Cash and cash equivalents at end of period $ 1,248 $ 1,897