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Debt and Equity Transactions (Unaudited) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Feb. 27, 2015 | Dec. 31, 2014 | Apr. 30, 2014
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 20,900,000,000 |  | $ 20,900,000,000 |  |  |  |
Liabilities, Fair Value Adjustment |  |  | 225,000,000 |  |  |  |
Debt Instrument, Unamortized Discount (Premium), Net | 21,000,000 |  | 21,000,000 |  |  |  |
Unamortized Debt Issuance Expense | 116,000,000 |  | 116,000,000 |  |  | $ 121,000,000 |
Net gain on early extinguishment of debt | 0 | $ 5,000,000 | 0 | $ 5,000,000 |  |  |
Bank Term Loan [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount | 4,000,000,000 |  | 4,000,000,000 |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  |  | $ 205,000,000 | 650,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  |  | 272,000,000 | 200,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  |  |  | 1,000,000,000 | $ 2,200,000,000 |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  |  |  | 313,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  | $ 1,300,000,000 |  |
Credit Facility [Domain] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | 985,000,000 |  | 985,000,000 |  |  |  |
Letters of Credit Outstanding, Amount | 42,000,000 |  | 42,000,000 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 3,000,000,000 |  | 3,000,000,000 |  |  |  |
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit | 1,500,000,000 |  | 1,500,000,000 |  |  |  |
Senior Notes [Member] | 6.625% Senior Notes due 2021 [Member] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | 210,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 6.625%
Net gain on early extinguishment of debt |  | $ 6,000,000 |  |  |  |  |
Cerro Verde [Member] | Credit Facility [Domain] |  |  |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | 1,300,000,000 |  | 1,300,000,000 |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,800,000,000 |  | 1,800,000,000 |  |  |  |
Letters of Credit Outstanding, Amount | 0 |  | 0 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 531,000,000 |  | $ 531,000,000 |  |  |  |
Term of Debt Agreement |  |  | 5 years |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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