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Earnings Per Share (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income $ 660 $ 610 $ 1,286 $ 1,434
Net income attributable to noncontrolling interests (168) (125) (274) (301)
Preferred dividends on redeemable noncontrolling interest (10) (3) (20) (3)
Undistributed earnings allocable to participating securities (2) 0 (3) 0
Net income allocable to FCX common stockholders $ 480      
Basic weighted-average shares of common stock outstanding 1,039 980 1,039 965
Add shares issuable upon exercise or vesting of dilutive stock options and RSUs 6 [1] 4 6 [1] 3
Diluted weighted-average shares of common stock outstanding 1,045 984 1,045 968
Basic net income per share attributable to FCX common stockholders $ 0.46 $ 0.49 $ 0.95 $ 1.17
Diluted net income per share attributable to FCX common stockholders $ 0.46 $ 0.49 $ 0.95 $ 1.17
Potential anti-dilutive additional shares of common stock (in shares) 3   3  
Outstanding stock options with exercise prices greater than average market price of common stock 30 32 30 30
Weighted-average exercise price of outstanding stock options not in-the-money $ 41.05 $ 40.53 $ 41.05 $ 40.92
[1] Excluded shares of common stock associated with outstanding stock options with exercise prices less than the average market price of FCX's common stock that were anti-dilutive totaled approximately 3 million for both second-quarter 2014 and for the six months ended June 30, 2014.