Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flow from operating activities:
Net income	$ 824	$ 1,001
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	329	267
Stock-based compensation	41	32
Pension plans contributions	(22)	(52)
Net charges for reclamation and environmental obligations, including accretion	34	35
Payments for reclamation and environmental obligations	(36)	(45)
Losses on early extinguishment of debt	45	168
Deferred income taxes	136	168
Increase in long-term mill and leach stockpiles	(126)	(61)
Other, net	36	8
(Increases) decreases in working capital and other tax payments:
Accounts receivable	(113)	(482)
Inventories	(67)	(248)
Other current assets	(48)	40
Accounts payable and accrued liabilities	(201)	(64)
Accrued income taxes and other tax payments	(1)	34
Net cash provided by operating activities	831	801
Capital expenditures:
North America copper mines	(258)	(143)
South America	(226)	(152)
Indonesia	(191)	(182)
Africa	(57)	(127)
Molybdenum mines	(40)	(93)
Other	(33)	(10)
Acquisition of cobalt refinery, net of cash acquired	(321)	0
Other, net	14	(7)
Net cash used in investing activities	(1,112)	(714)
Cash flow from financing activities:
Proceeds from debt	6,615	3,004
Repayments of debt	(39)	(3,159)
Cash dividends paid:
Common stock	(297)	(238)
Noncontrolling interests	(35)	(1)
Debt financing costs	(72)	(22)
Net payments for stock-based awards	(2)	(4)
Excess tax benefit from stock-based awards	1	7
Net cash provided by (used in) financing activities	6,171	(413)
Net increase (decrease) in cash and cash equivalents	5,890	(326)
Cash and cash equivalents at beginning of year	3,705	4,822
Cash and cash equivalents at end of period	$ 9,595	$ 4,496