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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension and other postretirement benefits |  |  |  |
Total Other comprehensive income | $ 48 | $ 67 | $ 79 | $ 100
Foreign currency translation |  |  |  |
Other comprehensive income | 99 | 77 | 166 | 487
Available-for-sale securities |  |  |  |
Other comprehensive (loss) income | (101) | 3 | (134) | 4
Cash flow hedges |  |  |  |
Total Other comprehensive income (loss) | (2) | (137) | 3 | (219)
Arconic [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period | (1,979) | (3,579) | (2,010) | (3,611)
Unrecognized net actuarial loss and prior service cost | 17 | (5) | 11 | (64)
Tax (expense) benefit | (5) | 3 | (4) | 26
Total Other comprehensive loss before reclassifications, net of tax | 12 | (2) | 7 | (38)
Amortization of net actuarial loss and prior service cost | 56 | 104 | 111 | 208
Tax (expense) benefit | (20) | (37) | (39) | (73)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 36 | 67 | 72 | 135
Total Other comprehensive income | 48 | 65 | 79 | 97
Balance at end of period | (1,931) | (3,514) | (1,931) | (3,514)
Foreign currency translation |  |  |  |
Balance at beginning of period | (622) | (2,109) | (689) | (2,412)
Other comprehensive income | 99 | 45 | 166 | 348
Balance at end of period | (523) | (2,064) | (523) | (2,064)
Available-for-sale securities |  |  |  |
Balance at beginning of period | 99 | (4) | 132 | (5)
Other comprehensive (loss) income | (101) | 3 | (134) | 4
Balance at end of period | (2) | (1) | (2) | (1)
Cash flow hedges |  |  |  |
Balance at beginning of period | 4 | 517 | (1) | 597
Net change from periodic revaluations | (4) | (225) | 4 | (342)
Tax (expense) benefit | 1 | 66 | (2) | 103
Total Other comprehensive income (loss) before reclassifications, net of tax | (3) | (159) | 2 | (239)
Net amount reclassified to earnings | 1 | 7 | 1 | 5
Tax benefit (expense) |  | (1) |  | 1
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 1 | 6 | 1 | 6
Total Other comprehensive income (loss) | (2) | (153) | 3 | (233)
Balance at end of period | 2 | 364 | 2 | 364
Noncontrolling Interests [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period |  | (55) |  | (56)
Unrecognized net actuarial loss and prior service cost |  | 1 |  | 1
Total Other comprehensive loss before reclassifications, net of tax |  | 1 |  | 1
Amortization of net actuarial loss and prior service cost |  |  |  | 2
Tax (expense) benefit |  | 1 |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  | 1 |  | 2
Total Other comprehensive income |  | 2 |  | 3
Balance at end of period |  | (53) |  | (53)
Foreign currency translation |  |  |  |
Balance at beginning of period | (2) | (673) | (2) | (780)
Other comprehensive income |  | 32 |  | 139
Balance at end of period | $ (2) | (641) | $ (2) | (641)
Cash flow hedges |  |  |  |
Balance at beginning of period |  | (5) |  | (3)
Net change from periodic revaluations |  | 18 |  | 15
Tax (expense) benefit |  | (5) |  | (4)
Total Other comprehensive income (loss) before reclassifications, net of tax |  | 13 |  | 11
Net amount reclassified to earnings |  | 5 |  | 5
Tax benefit (expense) |  | (2) |  | (2)
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  | 3 |  | 3
Total Other comprehensive income (loss) |  | 16 |  | 14
Balance at end of period |  | $ 11 |  | $ 11

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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 14A -URI http://asc.fasb.org/extlink&oid=84228862&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 11 -URI http://asc.fasb.org/extlink&oid=84228862&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 14 -URI http://asc.fasb.org/extlink&oid=84228862&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 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging 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 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 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=84228862&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=84228862&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=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + 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 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&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=84228862&loc=d3e637-108580 Reference 4: 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=64808268&loc=d3e32022-110900 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=84228862&loc=SL7669686-108580 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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