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Financial Instruments (Unaudited) Unsettled Derivatives (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Paid to brokers associated with margin requirements $ 11 $ 1
Derivative Asset 11 59
Derivative Liability 401 320
Trade Accounts Receivable [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset 7 53
Derivative Liability 0 0
Other Current Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 6
Derivative Liability 0 0
Accounts Payable and Accrued Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset 4 0
Derivative Liability 302 205
Other Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0 0
Derivative Liability 99 115
Commodity Contract [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Asset position 15 69
Liability position 405 330
Derivative Asset, Fair Value, Gross Liability 4 10
Derivative Liability, Fair Value, Gross Asset 4 10
Derivative Asset 11 59
Derivative Liability 401 320
Commodity Contract [Member] | Copper Derivatives [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Asset position 2 6
Liability position 8 1
Derivative Asset, Fair Value, Gross Liability 2 0
Derivative Liability, Fair Value, Gross Asset 2 0
Derivative Asset 0 6
Derivative Liability 6 1
Commodity Contract [Member] | Copper futures and swap contracts [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Asset position 2 [1] 6 [1]
Liability position 8 [1] 0 [1]
Commodity Contract [Member] | Copper forward contracts [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Liability position 0 1
Commodity Contract [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Asset position 13 63
Liability position 99 16
Derivative Asset, Fair Value, Gross Liability 2 10
Derivative Liability, Fair Value, Gross Asset 2 10
Derivative Asset 11 53
Derivative Liability 97 6
Commodity Contract [Member] | Natural gas swaps [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Liability position 10 4
Commodity Contract [Member] | Crude Oil and Natural Gas Derivatives [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Asset position 0 0
Liability position 298 313
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Liability, Fair Value, Gross Asset 0 0
Derivative Asset 0 0
Derivative Liability 298 313
Crude Oil Options [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Derivatives not designated as hedging instruments
    
Derivatives, Fair Value [Line Items]    
Liability position 288 [2] 309 [2]
Deferred Option Premiums and Accrued Interest [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 387 $ 444
[1] FCX paid $11 million to brokers at March 31, 2014, and $1 million at December 31, 2013, for margin requirements (recorded in other current assets).
[2] Included $387 million at March 31, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.