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Recently Adopted and Recently Issued Accounting Guidance - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Other comprehensive income: |  |
Total Other comprehensive income | $ 96 | $ 58
Other comprehensive (loss) income: |  |
Foreign currency translation adjustments | (100) | 309
Other comprehensive income: |  |
Total Other comprehensive income | 1 | 2
Net amount reclassified to earnings: |  |
Total Other comprehensive income (loss) | 115 | (83)
Alcoa [Member] |  |
Pension and other postretirement benefits |  |
Balance at beginning of period | (4,063) | (3,533)
Other comprehensive income: |  |
Unrecognized net actuarial loss and prior service cost/benefit | 11 | (13)
Tax (expense) benefit | (3) | 3
Total Other comprehensive income before reclassifications, net of tax | 8 | (10)
Amortization of net actuarial loss and prior service cost/benefit | 132 | 101
Tax (expense) benefit | (45) | (35)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 87 | 66
Total Other comprehensive income | 95 | 56
Balance at end of period | (3,968) | (3,477)
Foreign currency translation |  |
Balance at beginning of period | 1,147 | 1,349
Other comprehensive (loss) income: |  |
Foreign currency translation adjustments | (116) | 244
Balance at end of period | 1,031 | 1,593
Available-for-sale securities |  |
Balance at beginning of period | 3 |
Other comprehensive income: |  |
Net unrealized holding (loss) gain | (1) | 3
Tax benefit (expense) |  | (1)
Total Other comprehensive (loss) income before reclassifications, net of tax | (1) | 2
Net amount reclassified to earnings | 2 |
Tax benefit (expense) |  |
Total amount reclassified from Accumulated other comprehensive income, net of tax | 2 |
Total Other comprehensive income | 1 | 2
Balance at end of period | 4 | 2
Cash flow hedges |  |
Balance at beginning of period | (489) | (443)
Other comprehensive income (loss): |  |
Net change from periodic revaluations | 136 | (103)
Tax (expense) benefit | (29) | 21
Total Other comprehensive income (loss) before reclassifications, net of tax | 107 | (82)
Net amount reclassified to earnings: |  |
Net amount reclassified to earnings | 7 | (1)
Tax (expense) benefit | (1) | 2
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 6 | 1
Total Other comprehensive income (loss) | 113 | (81)
Balance at end of period | (376) | (524)
Alcoa [Member] | Aluminum contracts [Member] |  |
Net amount reclassified to earnings: |  |
Net amount reclassified to earnings | 7 |
Alcoa [Member] | Interest rate contracts [Member] |  |
Net amount reclassified to earnings: |  |
Net amount reclassified to earnings |  | (1)
Noncontrolling Interests [Member] |  |
Pension and other postretirement benefits |  |
Balance at beginning of period | (77) | (99)
Other comprehensive income: |  |
Amortization of net actuarial loss and prior service cost/benefit | 1 | 2
Tax (expense) benefit | 0 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 1 | 2
Total Other comprehensive income | 1 | 2
Balance at end of period | (76) | (97)
Foreign currency translation |  |
Balance at beginning of period | 257 | 351
Other comprehensive (loss) income: |  |
Foreign currency translation adjustments | 16 | 65
Balance at end of period | 273 | 416
Other comprehensive income: |  |
Tax benefit (expense) |  |
Cash flow hedges |  |
Balance at beginning of period | (5) | (4)
Other comprehensive income (loss): |  |
Net change from periodic revaluations | 3 | (3)
Tax (expense) benefit | (1) | 1
Total Other comprehensive income (loss) before reclassifications, net of tax | 2 | (2)
Net amount reclassified to earnings: |  |
Total Other comprehensive income (loss) | 2 | (2)
Balance at end of period | $ (3) | $ (6)

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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- Definition The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j-k) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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X
- Details
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Namespace Prefix: | us-gaap_
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