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Noncontrolling Interests - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Noncontrolling Interest [Line Items] |  |  |
Proceeds from noncontrolling shareholder | $ 12 | $ 171 | $ 169
Charges related to legal matters included in noncontrolling interests | 391 | 85 |
Noncontrolling Interests [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Proceeds from noncontrolling shareholder | 12 | 171 | 169
Charges related to legal matters included in noncontrolling interests | 17 | 34 |
Alumina Limited [Member] |  |  |
Noncontrolling Interest [Line Items] |  |  |
Proceeds from noncontrolling shareholder | $ 9 | $ 171 | $ 169

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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Period Type: | duration

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- Definition Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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