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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive Loss by Component (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Pension and other postretirement benefits |  |  |  |
Total Other comprehensive income (loss) | $ 122 | $ 124 | $ 214 | $ 283
Foreign currency translation |  |  |  |
Other comprehensive loss | (1,000) | (36) | (464) | (988)
Available-for-sale securities |  |  |  |
Other comprehensive (loss) income | (1) | 1 | 0 | (1)
Cash flow hedges (P) |  |  |  |
Total Other comprehensive (loss) income | (14) | (49) | (11) | 135
Alcoa [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period | (3,441) | (3,907) | (3,532) | (4,063)
Unrecognized net actuarial loss and prior service cost/benefit | 96 | 46 | 33 | 19
Tax (expense) benefit | (33) | (12) | (8) | 2
Total Other comprehensive income before reclassifications, net of tax | 63 | 34 | 25 | 21
Amortization of net actuarial loss and prior service cost/benefit | 97 | 135 | 296 | 395
Tax (expense) benefit | (34) | (47) | (104) | (138)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 63 | 88 | 192 | 257
Total Other comprehensive income (loss) | 126 | 122 | 217 | 278
Balance at end of period | (3,315) | (3,785) | (3,315) | (3,785)
Foreign currency translation |  |  |  |
Balance at beginning of period | 569 | 428 | 179 | 1,147
Other comprehensive loss | (774) | (4) | (384) | (723)
Balance at end of period | (205) | 424 | (205) | 424
Available-for-sale securities |  |  |  |
Balance at beginning of period | 3 | 1 | 2 | 3
Other comprehensive (loss) income | (1) | 1 | 0 | (1)
Balance at end of period | 2 | 2 | 2 | 2
Cash flow hedges (P) |  |  |  |
Balance at beginning of period | (299) | (305) | (308) | (489)
Net change from periodic revaluations | (35) | (70) | (31) | 151
Tax benefit (expense) | 11 | 14 | 7 | (31)
Total Other comprehensive (loss) income before reclassifications, net of tax | (24) | (56) | (24) | 120
Net amount reclassified to earnings | 6 | 8 | 17 | 16
Tax expense | (1) | (2) | (3) | (2)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 5 | 6 | 14 | 14
Total Other comprehensive (loss) income | (19) | (50) | (10) | 134
Balance at end of period | (318) | (355) | (318) | (355)
Alcoa [Member] | Aluminum Contracts [Member] |  |  |  |
Cash flow hedges (P) |  |  |  |
Net amount reclassified to earnings | 7 | 5 | 18 | 12
Alcoa [Member] | Foreign Exchange Contracts [Member] |  |  |  |
Cash flow hedges (P) |  |  |  |
Net amount reclassified to earnings | (1) | 3 | (2) | 3
Alcoa [Member] | Interest Rate Contracts [Member] |  |  |  |
Cash flow hedges (P) |  |  |  |
Net amount reclassified to earnings |  |  | 1 | 1
Noncontrolling Interests [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period | (50) | (74) | (51) | (77)
Unrecognized net actuarial loss and prior service cost/benefit | (9) |  | (9) |
Tax (expense) benefit | 3 |  | 3 |
Total Other comprehensive income before reclassifications, net of tax | (6) |  | (6) |
Amortization of net actuarial loss and prior service cost/benefit | 3 | 2 | 5 | 7
Tax (expense) benefit | (1) |  | (2) | (2)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 2 | 2 | 3 | 5
Total Other comprehensive income (loss) | (4) | 2 | (3) | 5
Balance at end of period | (54) | (72) | (54) | (72)
Foreign currency translation |  |  |  |
Balance at beginning of period | 36 | 24 | (110) | 257
Other comprehensive loss | (226) | (32) | (80) | (265)
Balance at end of period | (190) | (8) | (190) | (8)
Available-for-sale securities |  |  |  |
Other comprehensive (loss) income | 0 | 0 | 0 | 0
Cash flow hedges (P) |  |  |  |
Balance at beginning of period | (8) | (5) | (2) | (5)
Net change from periodic revaluations | 7 | 2 | (2) | 2
Tax benefit (expense) | (2) | (1) | 1 | (1)
Total Other comprehensive (loss) income before reclassifications, net of tax | 5 | 1 | (1) | 1
Total Other comprehensive (loss) income | 5 | 1 | (1) | 1
Balance at end of period | $ (3) | $ (4) | $ (3) | $ (4)

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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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: 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=36458714&loc=d3e681-108580 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=36458714&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 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + 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 Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: 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=36458714&loc=d3e681-108580 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=36458714&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 10A -Subparagraph (j-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 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=35743120&loc=d3e1928-114920 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: 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=36458714&loc=d3e637-108580 Reference 2: 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=36458714&loc=d3e681-108580 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=36458714&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 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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