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Debt and Equity Transactions (Unaudited) (Details) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2013 Senior Notes [Member] | Mar. 31, 2014 Senior Notes [Member] | Mar. 07, 2013 Senior Notes [Member] | Mar. 31, 2014 Senior Notes [Member] 2.375% Senior Notes due March 2018 [Member] | Mar. 31, 2014 Senior Notes [Member] 3.100% Senior Notes due March 2020 [Member] | Mar. 31, 2014 Senior Notes [Member] 3.875% Senior Notes due March 2023 [Member] | Mar. 31, 2014 Senior Notes [Member] 5.450% Senior Notes due March 2043 [Member] | Mar. 31, 2014 Line of Credit [Member] | Mar. 31, 2014 Credit Facility [Domain] Revolving Credit Facility [Member] | Dec. 31, 2012 Credit Facility [Domain] Revolving Credit Facility [Member] | Jun. 30, 2013 Bank Term Loan [Member] | Mar. 31, 2014 Bank Term Loan [Member] | Feb. 14, 2013 Bank Term Loan [Member] | Mar. 31, 2013 Bridge Loan [Member] | Mar. 31, 2014 Option 1 [Member] Bank Term Loan [Member] | Mar. 31, 2014 Option 2 [Member] Bank Term Loan [Member] | May 31, 2013 Plains Exploration & Production Company [Member] | Jun. 30, 2014 Plains Exploration & Production Company [Member] Senior Notes [Member] 6.625% Senior Notes due 2021 [Member] | Mar. 31, 2014 Plains Exploration & Production Company [Member] Senior Notes [Member] 6.625% Senior Notes due 2021 [Member] | Mar. 31, 2014 Cerro Verde [Member] Credit Facility [Domain] | Mar. 31, 2014 Cerro Verde [Member] Tranche 1 [Member] Credit Facility [Domain] | Mar. 31, 2014 Cerro Verde [Member] Tranche 2 [Member] Credit Facility [Domain] | Mar. 31, 2014 Cerro Verde [Member] Tranche 3 [Member] Credit Facility [Domain]
Extinguishment of Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 210,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.375% | 3.10% | 3.875% | 5.45% |  |  |  |  |  |  |  |  |  |  |  | 6.625% |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  | 6,400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt | 0 | (45,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,000,000) |  |  |  | 6,000,000 |  |  |  |  |
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  |  |  |  |  |  |  |  |  | 115,000,000 | 0 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | 450,000,000 | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  | 1,800,000,000 |  |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  |  |  |  | May 31, 2018 | Mar. 30, 2016 |  |  |  |  |  |  |  |  |  | Mar. 10, 2019 | Sep. 30, 2017 | Mar. 31, 2018 | Sep. 30, 2018
Amount of revolving credit facility available to subsidiary |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 31, 2013 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 1.19% |  |  |  | 1.65% |  |  |  |  |  |  |  |  |  |  |
Term of Debt Agreement |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  | 5 years |  |  |
Line Of Credit Facility Remaining Borrowing Capacity Available For Letters Of Credit |  |  |  |  |  |  |  |  |  |  | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | alternate base rate |  |  |  | LIBOR |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 0.50% |  |  |  | 1.90% |  |  |
Term When Funds Are Available to be Drawn on Debt Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Line of Credit Facility, Current Borrowing Capacity, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% | 70.00% | 35.00%
Letters of Credit Outstanding, Amount |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 6,500,000,000 | 6,500,000,000 | 1,500,000,000 | 1,000,000,000 | 2,000,000,000 | 2,000,000,000 |  |  |  |  | 4,000,000,000 | 4,000,000,000 | 9,500,000,000 |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000,000,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6401765&loc=d3e13305-112630 + Details
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