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Contingencies and Commitments (Unaudited) (Details) shares in Millions, IDR in Trillions | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2016 USD ($) shares | May 31, 2016 | Sep. 30, 2016 USD ($) shares | Jun. 30, 2016 USD ($) shares | Jan. 11, 2017 | Sep. 30, 2016 USD ($) shares | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2016 IDR | May 10, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2014 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  | 33.5 |  |  |  |  | 28.0 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  | $ 415,000,000 |  |  |  |  | $ 311,000,000 |  | $ 1,500,000,000 |  |  | $ 2,000,000,000 |  |  |  |
Gain (Loss) on Contract Termination |  |  |  |  |  |  |  |  |  | (606,000,000) |  | $ 0 |  |  |  |  |
PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment By Foreign Government Of Alleged Obligations |  |  | 231,000,000 |  |  |  |  | 231,000,000 |  | 231,000,000 |  |  |  |  |  |  |
Value Added Tax Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 269,000,000
Assessment By Foreign Government of Alleged Obligations, Expressed in Foreign Currency | IDR |  |  |  |  |  |  |  |  |  |  |  |  |  | IDR 3.0 |  |  |
Income Tax Examination, Penalties Accrued |  |  | 0 |  |  |  |  | 0 |  | 0 |  |  |  |  |  |  |
Royalty Tax [Member] | Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | 537,000,000 |  |  |  |  | 537,000,000 |  | 537,000,000 |  |  |  |  |  |  |
RelatingtotheperiodDecember2006throughSeptember2011 [Member] | Royalty Tax [Member] | Cerro Verde [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment By Foreign Government Of Alleged Obligations |  |  | 430,000,000 |  |  |  |  | 430,000,000 |  | 430,000,000 |  |  |  |  |  |  |
Tax Year 2014 [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assessment By Foreign Government Of Alleged Obligations |  |  |  |  | $ 156,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Tax Overpayment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 284,000,000
Proceeds from Income Tax Refunds |  |  |  |  | 128,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Disputed Tax Assessments Receivable |  |  | 152,000,000 |  |  |  |  | 152,000,000 |  | 152,000,000 |  |  |  |  |  |  |
Cash and Cash Equivalents [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 196,000,000 |
Other Liabilities [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000,000 |
Rowan Companies plc [Member] | Contract Termination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments made under settlement agreement |  |  |  |  | 85,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payable under settlement agreement |  |  | 130,000,000 |  |  |  |  | 130,000,000 |  | 130,000,000 |  |  |  |  |  |  |
Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period, Contingent Consideration |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Change of Amount as Result of Variable Components |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Measurements, Recurring [Member] | Reported Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Accrual, Noncurrent |  |  | $ 18,000,000 | [1] | $ 18,000,000 | [2] |  | $ 18,000,000 | [1] | $ 18,000,000 | [1] |  |  |  |  |  |
Noble Drilling LLC [Member] | Maximum [Member] | Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Payments, Contract Termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |
Rowan Companies plc [Member] | Maximum [Member] | Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Payments, Contract Termination |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |
Ultra-deepwater Drillship Contracts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares |  |  |  |  | 48.0 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  |  |  |  | $ 540,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | shares | 26.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 304,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | PT Freeport Indonesia [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration Date, Export Permit |  |  |  |  |  |  | Jan. 11, 2017 |  |  |  |  |  |  |  |  |  |
[1] | Included in accounts payable and accrued liabilities.
[2] | Recorded at cost except for debt assumed in acquisitions, which were recorded at fair value at the respective acquisition dates.

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