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Income Taxes (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Tax Disclosure [Line Items]
Taxes on U.S. operations	$ 110	$ 120	$ 193	$ 258
Taxes on international operations	312	786	720	1,632
Total	422	906	913	1,890
Consolidated effective income tax rate (percent)			33.00%	35.00%
Cerro Verde [Member]
Income Tax Disclosure [Line Items]
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 240		$ 240

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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