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Accumulated other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Pension and other postretirement benefits |  |  |
Total Other comprehensive income (loss) | $ 557 | $ (507) | $ (652)
Foreign currency translation |  |  |
Other comprehensive loss | (1,335) | (296) | (708)
Available-for-sale-securities |  |  |
Other comprehensive (loss) income | (1) | 2 |
Cash flow hedges |  |  |
Total Other comprehensive income (loss) | 184 | (47) | 179
Alcoa [Member] |  |  |
Pension and other postretirement benefits |  |  |
Balance at beginning of period | (4,063) | (3,534) | (2,941)
Unrecognized net actuarial loss and prior service cost/benefit | 281 | (1,184) | (1,159)
Tax (expense) benefit | (88) | 398 | 399
Total Other comprehensive income (loss) before reclassifications, net of tax | 193 | (786) | (760)
Amortization of net actuarial loss and prior service cost/benefit | 520 | 396 | 257
Tax (expense) benefit | (182) | (139) | (90)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 338 | 257 | 167
Total Other comprehensive income (loss) | 531 | (529) | (593)
Balance at end of period | (3,532) | (4,063) | (3,534)
Foreign currency translation |  |  |
Balance at beginning of period | 1,147 | 1,349 | 1,892
Other comprehensive loss | (968) | (202) | (543)
Balance at end of period | 179 | 1,147 | 1,349
Available-for-sale-securities |  |  |
Balance at beginning of period | 3 | 1 | 1
Other comprehensive (loss) income | (1) | 2 |
Balance at end of period | 2 | 3 | 1
Cash flow hedges |  |  |
Balance at beginning of period | (489) | (443) | (627)
Net change from periodic revaluations | 205 | (2) | 88
Tax (expense) benefit | (43) | (10) | (25)
Total Other comprehensive income (loss) before reclassifications, net of tax | 162 | (12) | 63
Net amount reclassified to earnings | (22) | 62 | (167)
Tax (expense) benefit | (3) | 28 | (46)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 19 | (34) | 121
Total Other comprehensive income (loss) | 181 | (46) | 184
Balance at end of period | (308) | (489) | (443)
Alcoa [Member] | Aluminum Contracts [Member] |  |  |
Cash flow hedges |  |  |
Net amount reclassified to earnings | 18 | (65) | 152
Alcoa [Member] | Energy Contracts [Member] |  |  |
Cash flow hedges |  |  |
Net amount reclassified to earnings |  |  | 13
Alcoa [Member] | Foreign Exchange Contracts [Member] |  |  |
Cash flow hedges |  |  |
Net amount reclassified to earnings | 2 |  | (3)
Alcoa [Member] | Interest Rate Contracts [Member] |  |  |
Cash flow hedges |  |  |
Net amount reclassified to earnings | 2 | 3 | 5
Noncontrolling Interests [Member] |  |  |
Pension and other postretirement benefits |  |  |
Balance at beginning of period | (77) | (99) | (40)
Unrecognized net actuarial loss and prior service cost/benefit | 28 | 15 | (97)
Tax (expense) benefit | (9) | (4) | 32
Total Other comprehensive income (loss) before reclassifications, net of tax | 19 | 11 | (65)
Amortization of net actuarial loss and prior service cost/benefit | 11 | 16 | 9
Tax (expense) benefit | (4) | (5) | (3)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 7 | 11 | 6
Total Other comprehensive income (loss) | 26 | 22 | (59)
Balance at end of period | (51) | (77) | (99)
Foreign currency translation |  |  |
Balance at beginning of period | 257 | 351 | 516
Other comprehensive loss | (367) | (94) | (165)
Balance at end of period | (110) | 257 | 351
Cash flow hedges |  |  |
Balance at beginning of period | (5) | (4) | 1
Net change from periodic revaluations | 4 | (1) | (8)
Tax (expense) benefit | (1) |  | 2
Total Other comprehensive income (loss) before reclassifications, net of tax | 3 | (1) | (6)
Net amount reclassified to earnings |  |  | (1)
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  |  | 1
Total Other comprehensive income (loss) | 3 | (1) | (5)
Balance at end of period | (2) | (5) | (4)
Noncontrolling Interests [Member] | Interest Rate Contracts [Member] |  |  |
Cash flow hedges |  |  |
Net amount reclassified to earnings |  |  | $ 1

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: 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=28358780&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 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 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=28358780&loc=d3e681-108580 Reference 5: 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=28361610&loc=d3e1928-114920 + Details
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