Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flow from operating activities:
Net income	$ 1,001	$ 1,861
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	267	232
Stock-based compensation	32	43
Pension plans contributions	(52)	0
Charges for reclamation and environmental obligations, including accretion	35	38
Payments of reclamation and environmental obligations	(45)	(52)
Losses on early extinguishment of debt	168	7
Deferred income taxes	168	127
(Increase) decrease in long-term mill and leach stockpiles	(61)	23
Other, net	8	(34)
(Increases) decreases in working capital:
Accounts receivable	(482)	511
Inventories	(248)	(253)
Other current assets	40	(18)
Accounts payable and accrued liabilities	(64)	(264)
Accrued income and other taxes	34	138
Net cash provided by operating activities	801	2,359
Capital expenditures:
North America copper mines	(143)	(119)
South America	(152)	(140)
Indonesia	(182)	(125)
Africa	(127)	(11)
Molybdenum	(95)	(71)
Other	(8)	(39)
Other, net	(7)	0
Net cash used in investing activities	(714)	(505)
Cash flow from financing activities:
Proceeds from debt	3,004	9
Repayments of debt	(3,159)	(13)
Restricted cash for early extinguishment of debt	0	(1,124)
Cash dividends paid:
Common stock	(238)	(238)
Noncontrolling interests	(1)	(133)
Contributions from noncontrolling interests	0	5
Net payments for stock-based awards	(4)	(20)
Excess tax benefit from stock-based awards	7	21
Other, net	(22)	(9)
Net cash used in financing activities	(413)	(1,502)
Net (decrease) increase in cash and cash equivalents	(326)	352
Cash and cash equivalents at beginning of year	4,822	3,738
Cash and cash equivalents at end of period	$ 4,496	$ 4,090