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Debt and Equity Transactions (Unaudited) (Details) - USD ($)
shares in Millions
1 Months Ended 2 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 12 Months Ended
Aug. 04, 2016
Jul. 29, 2016
Jan. 05, 2016
Aug. 04, 2016
Jul. 31, 2016
Feb. 26, 2016
Jun. 30, 2016
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jan. 05, 2016
Dec. 31, 2015
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross [1]             $ 19,319,000,000   $ 19,319,000,000     $ 20,428,000,000
Debt, Current             (770,000,000)   (770,000,000)     (649,000,000)
Long-term debt, less current portion             18,549,000,000   18,549,000,000     19,779,000,000
Liabilities, Fair Value Adjustment                 195,000,000     210,000,000
Unamortized Debt Issuance Expense             120,000,000   120,000,000     $ 129,000,000
Early Repayment of Subordinated Debt             $ 568,000,000          
Stock Issued During Period, Shares, New Issues     4       17       210 206
Extinguishment of Debt, Amount             $ 266,000,000          
Proceeds from Issuance of Common Stock     $ 1,970,000,000           32,000,000 $ 0    
Fees and Commissions     20,000,000                  
Bank Term Loan [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             2,446,000,000   2,446,000,000     $ 3,032,000,000
Credit Facility [Domain] | Revolving Credit Facility [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             0   0     0
Debt Instrument, Amendment Date           Feb. 26, 2016            
Line of Credit Facility, Maximum Borrowing Capacity           $ 3,500,000,000           4,000,000,000
Letters of Credit Issued, Amount             40,000,000   40,000,000      
Line of Credit Facility, Remaining Borrowing Capacity             3,500,000,000   3,500,000,000      
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit             1,500,000,000   1,500,000,000      
Line of Credit [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             192,000,000   192,000,000     442,000,000
Senior Notes [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             11,648,000,000   11,648,000,000     11,908,000,000
Extinguishment of Debt, Amount             268,000,000          
Extinguishment of Debt, Principal Amount             268,000,000          
Notes Payable, Other Payables [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             105,000,000   105,000,000     108,000,000
Cerro Verde [Member] | Credit Facility [Domain]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             1,784,000,000   1,784,000,000     1,781,000,000
Cerro Verde [Member] | Shareholder Loan [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             261,000,000   261,000,000     259,000,000
Freeport-McMoRan Oil & Gas [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term debt, less current portion             7,425,000,000   7,425,000,000     5,883,000,000
Proceeds from Issuance of Common Stock                 0      
Freeport-McMoRan Oil & Gas [Member] | Senior Notes [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             2,524,000,000   2,524,000,000     2,539,000,000
Freeport McMoRan Corporation [Member] | Subordinated Debt [Member]                        
Extinguishment of Debt [Line Items]                        
Long-term Debt, Gross             359,000,000   $ 359,000,000     359,000,000
Subsequent Event [Member]                        
Extinguishment of Debt [Line Items]                        
Common Stock, Value of Shares Authorized for Issue in Transaction   $ 12,000,000                    
Stock Issued During Period, Shares, New Issues       8 3              
Proceeds from Issuance of Common Stock, Gross         $ 226,000,000              
Subsequent Event [Member] | Senior Notes [Member]                        
Extinguishment of Debt [Line Items]                        
Extinguishment of Debt, Principal Amount       $ 101,000,000                
Common Stock [Member]                        
Extinguishment of Debt [Line Items]                        
Stock Issued During Period, Shares, New Issues                 70      
Proceeds from Issuance of Common Stock, Gross     $ 32,000,000                 $ 2,000,000,000
Common Stock [Member] | Subsequent Event [Member]                        
Extinguishment of Debt [Line Items]                        
Common Stock, Value of Shares Authorized for Issue in Transaction $ 12.69                      
Proceeds from Issuance of Common Stock, Gross 167,000,000     $ 85,000,000                
Proceeds from Issuance of Common Stock 166,000,000                      
Fees and Commissions $ 1,000,000                      
Minimum [Member]                        
Extinguishment of Debt [Line Items]                        
Asset Sales Required             $ 3,000,000,000   $ 3,000,000,000      
Maximum [Member] | Common Stock [Member] | Subsequent Event [Member]                        
Extinguishment of Debt [Line Items]                        
Stock Issued During Period, Shares, New Issues 13                      
Proceeds from Issuance of Common Stock, Gross               $ 1,500,000,000        
Morenci [Member]                        
Extinguishment of Debt [Line Items]                        
Change in Ownership, Percentage                 13.00%      
Ultra-deepwater Drillship Contracts [Member]                        
Extinguishment of Debt [Line Items]                        
Stock Issued During Period, Shares, New Issues             48          
Proceeds from Issuance of Common Stock, Gross             $ 540,000,000          
Fees and Commissions             $ 5,000,000          
[1] a.Includes additions for unamortized fair value adjustments totaling $195 million at June 30, 2016, and $210 million at December 31, 2015, and net reductions for unamortized debt issuance costs and unamortized discounts of $120 million at June 30, 2016, and $129 million at December 31, 2015.