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Earnings Per Share (Unaudited) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]    
Net income $ 626 $ 824
Net income attributable to noncontrolling interests (106) (176)
Preferred dividends on redeemable noncontrolling interest (10) 0
Undistributed earnings allocated to participating securities (1) 0
Net income attributable to FCX common stockholders $ 509 $ 648
Basic weighted-average shares of common stock outstanding 1,038 950
Add shares issuable upon exercise or vesting of dilutive stock options and restricted stock units 6 [1] 3
Diluted weighted-average shares of common stock outstanding 1,044 953
Basic net income per share attributable to FCX common stockholders $ 0.49 $ 0.68
Diluted net income per share attributable to FCX common stockholders $ 0.49 $ 0.68
Potential anti-dilutive additional shares of common stock (in shares) 2  
Outstanding stock options with exercise prices greater than average market price of common stock 30 29
Weighted-average exercise price of outstanding stock options not in-the-money $ 41.04 $ 41.35
[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 two million for first-quarter 2014.