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Fair Value Measurement (Unaudited) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Jun. 30, 2016
 [6]
Dec. 31, 2015
Derivatives:      
Derivative assets $ 48   $ 14
Derivatives:      
Derivative Liability 8   86
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 27   24
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 13   7
Derivatives:      
Derivative assets [2],[4] 3   1
Total assets 43   32
Derivatives:      
Derivative Liability [2],[4] 0   7
Loss Contingency, Accrual, Noncurrent [5] 0    
Long-term debt, including current portion [6] 0   0
Total liabilities 0   7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 120   112
Derivatives:      
Derivative assets [2],[4] 47   19
Total assets 167   131
Derivatives:      
Derivative Liability [2],[4] 10   85
Loss Contingency, Accrual, Noncurrent [5] 18    
Long-term debt, including current portion [6] 17,926   13,987
Total liabilities 17,954   14,072
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Derivatives:      
Derivative assets [2],[4] 0   0
Total assets 0   0
Derivatives:      
Derivative Liability [2],[4] 0   0
Loss Contingency, Accrual, Noncurrent [5] 0    
Long-term debt, including current portion [6] 0   0
Total liabilities 0   0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivatives:      
Derivative Liability [2],[4] 9   81
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   7
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivatives:      
Derivative Liability [2],[4] 1   4
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 1 [Member]      
Investment securities (current and long-term):      
Investment securities 0   0
Legally restricted funds (long-term):      
Legally restricted funds 0   0
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 2 [Member]      
Investment securities (current and long-term):      
Investment securities 0   0
Legally restricted funds (long-term):      
Legally restricted funds 0   0
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 3 [Member]      
Investment securities (current and long-term):      
Investment securities 0   0
Legally restricted funds (long-term):      
Legally restricted funds 0   0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 22   21
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 13   7
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 5   3
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 37   37
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 27   28
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 32   26
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 16   13
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 7   7
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 1 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 1   1
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 3 [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Derivatives:      
Derivative assets [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivatives:      
Derivative assets [2],[4] 47   19
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Derivatives:      
Derivative assets [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Derivatives:      
Derivative assets [2],[4] 3   1
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Derivatives:      
Derivative assets [2],[4] 0   0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Derivatives:      
Derivative assets [2],[4] 0   0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 51   47
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 188   171
Derivatives:      
Derivative assets [2],[4] 50   20
Derivatives:      
Derivative Liability [2],[4] 10   92
Loss Contingency, Accrual, Noncurrent 18 [5] $ 18  
Long-term debt, including current portion [6] 18,982   20,428
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 9   81
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 1   11
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 24   23
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 55   52
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 22   21
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 13   7
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 5   3
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 37   37
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 27   28
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 32   26
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 16   13
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 7   7
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 1   1
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative assets [2],[4] 47   19
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative assets [2],[4] 3   1
Reported Value Measurement [Member] | Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member]      
Investment securities (current and long-term):      
Investment securities 28   28
Reported Value Measurement [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member]      
Derivatives:      
Escrow Deposit Disbursements Related to Property Acquisition 120   118
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 51   47
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 188   171
Derivatives:      
Derivative assets [2],[4] 50   20
Total assets 289   238
Derivatives:      
Derivative Liability [2],[4] 10   92
Loss Contingency, Accrual, Noncurrent [5] 18    
Long-term debt, including current portion [6] 17,926   13,987
Total liabilities 17,954   14,079
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 9   81
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 1   11
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 24   23
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 55   52
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 22   21
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 13   7
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 5   3
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 37   37
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 27   28
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 32   26
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 16   13
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 7   7
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 1   1
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative assets [2],[4] 47   19
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative assets [2],[4] 3   1
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 24   23
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 55   52
Derivatives:      
Derivative assets [2],[4] 0   0
Total assets 79   75
Derivatives:      
Derivative Liability [2],[4] 0   0
Loss Contingency, Accrual, Noncurrent [5] 0    
Long-term debt, including current portion [6] 0   0
Total liabilities 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative Liability [2],[4] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 24   23
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 55   52
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member]      
Investment securities (current and long-term):      
Investment securities [1],[2] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]      
Legally restricted funds (long-term):      
Legally restricted funds [1],[2],[3] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member]      
Derivatives:      
Derivative assets [2],[4] 0   0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member]      
Derivatives:      
Derivative assets [2],[4] $ 0   $ 0
[1] Current portion included in other current assets and long-term portion included in other assets.
[2] Recorded at fair value.
[3] Excludes time deposits (which approximated fair value) included in (i) other current assets of $28 million at September 30, 2016, and December 31, 2015, and (ii) other assets of $120 million at September 30, 2016, and $118 million at December 31, 2015, primarily associated with an assurance bond to support PT Freeport Indonesia's (PT-FI) commitment for smelter development in Indonesia.
[4] Refer to Note 7 for further discussion and balance sheet classifications
[5] Included in accounts payable and accrued liabilities.
[6] Recorded at cost except for debt assumed in acquisitions, which were recorded at fair value at the respective acquisition dates.