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Contingencies and Commitments (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]  
Asset Retirement Obligation Disclosure [Text Block]
A summary of changes in FCX's AROs (included in reclamation and environmental obligations in the condensed consolidated balance sheet) for the nine months ended September 30, 2013, follows (in millions):
Balance at December 31, 2012
$
1,146

Liabilities assumed in the acquisitions of PXP and MMRa
1,024

Liabilities incurred
15

Settlements and revisions to cash flow estimates, net
(3
)
Accretion expense
66

Spending
(62
)
Other
(3
)
Balance at September 30, 2013
2,183

Less: current portion
(125
)
Long-term portion
$
2,058

a.
The fair value of AROs assumed in the acquisitions of PXP and MMR ($741 million and $283 million, respectively) were estimated based on projected cash flows, an estimated long-term annual inflation rate of 2.5 percent, and discount rates based on FCX's estimated credit-adjusted, risk-free interest rates ranging from 1.3 percent to 6.3 percent.