Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
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+ References

No definition available.

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- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 320
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-Paragraph 1
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- Definition

This element represents the cash inflow during the period from the sale of a component of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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DISPOSITIONS AND ACQUISITIONS (Morenci) (Details) - USD ($) $ in Millions		12 Months Ended
	May 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sales of assets		$ 649	$ 39	$ 717
Morenci
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage					85.00%
Proceeds from divestiture, net	$ 1,000
Net gain on sales of assets	$ 576
Morenci \| Sumitomo Metal Mining Co., Ltd.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage					15.00%
Morenci \| Wholly Owned Affiliate Of SMM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage	13.00%