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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income $ 626 $ 824
Defined benefit plans:    
Amortization of unrecognized amounts included in net periodic benefit costs 3 7
Unrealized losses on securities arising during the period 0 (1)
Other comprehensive income 3 6
Total comprehensive income 629 830
Total comprehensive income attributable to noncontrolling interests (106) (176)
Preferred dividends attributable to redeemable noncontrolling interest (10) 0
Total comprehensive income attributable to FCX common stockholders $ 513 $ 654