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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
	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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Amount of borrowing capacity currently available under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility, expressed as a percentage of the maximum borrowing capacity.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Gross amount of debt extinguished.

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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.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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