Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 9,595		$ 3,705
Trade accounts receivable	1,082		927
Other accounts receivable	687		702
Inventories:
Mill and leach stockpiles	1,698		1,672
Materials and supplies, net	1,575	[1]	1,504	[1]
Product	1,536		1,400
Other current assets	410		387
Total current assets	16,583		10,297
Property, plant, equipment and development costs, net	21,689		20,999
Long-term mill and leach stockpiles	2,081		1,955
Other assets	2,235		2,189
Total assets	42,588		35,440
Current liabilities:
Accounts payable and accrued liabilities	2,892		3,007
Current portion of reclamation and environmental obligations	254		241
Accrued income taxes	125		93
Current portion of debt	4		2
Total current liabilities	3,275		3,343
Long-term debt, less current portion	10,088		3,525
Deferred income taxes	3,580		3,490
Reclamation and environmental obligations, less current portion	2,130		2,127
Other liabilities	1,666		1,644
Total liabilities	20,739		14,129
FCX stockholders' equity:
Common stock	107		107
Capital in excess of par value	19,163		19,119
Retained earnings	2,750		2,399
Accumulated other comprehensive loss	(500)		(506)
Common stock held in treasury	(3,580)		(3,576)
Total FCX stockholders' equity	17,940		17,543
Noncontrolling interests	3,909		3,768
Total equity	21,849		21,311
Total liabilities and equity	$ 42,588		$ 35,440

[1] Materials and supplies inventory was net of obsolescence reserves totaling $27 million at March 31, 2013, and December 31, 2012.