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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Changes in Accumulated Other Comprehensive (Loss) by Component | The following table details the activity of the four components that comprise Accumulated other comprehensive loss for both Arconic’s shareholders and noncontrolling interests:
| Arconic |  | Noncontrolling Interests
| 2017 | 2016 | 2015 |  | 2017 | 2016 | 2015
Pension and other postretirement benefits (U) |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,010 | ) | $ | (3,611 | ) | $ | (3,601 | ) |  | $ | — |  | $ | (56 | ) | $ | (64 | )
Other comprehensive (loss) income: |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | (466 | ) | (1,112 | ) | (478 | ) |  | — |  | (9 | ) | 5 |
Tax benefit (expense) | 102 |  | 380 |  | 170 |  |  | — |  | 3 |  | (1 | )
Total Other comprehensive (loss) income before reclassifications, net of tax | (364 | ) | (732 | ) | (308 | ) |  | — |  | (6 | ) | 4 |
Amortization of net actuarial loss and prior service cost/benefit(1) | 222 |  | 389 |  | 458 |  |  | — |  | 4 |  | 6 |
Tax expense(2) | (78 | ) | (136 | ) | (160 | ) |  | — |  | (1 | ) | (2 | )
Total amount reclassified from Accumulated other comprehensive loss, net of tax(8) | 144 |  | 253 |  | 298 |  |  | — |  | 3 |  | 4 |
Total Other comprehensive (loss) income | (220 | ) | (479 | ) | (10 | ) |  | — |  | (3 | ) | 8 |
Transfer to Alcoa Corporation | — |  | 2,080 |  | — |  |  | — |  | 59 |  | — |
Balance at end of period | $ | (2,230 | ) | $ | (2,010 | ) | $ | (3,611 | ) |  | $ | — |  | $ | — |  | $ | (56 | )
Foreign currency translation |  |  |  |  |  |  |
Balance at beginning of period | $ | (689 | ) | $ | (2,412 | ) | $ | (846 | ) |  | $ | (2 | ) | $ | (780 | ) | $ | (351 | )
Other comprehensive income (loss)(3) | 252 |  | 268 |  | (1,566 | ) |  | 2 |  | 182 |  | (429 | )
Transfer to Alcoa Corporation | — |  | 1,455 |  | — |  |  | — |  | 596 |  | — |
Balance at end of period | $ | (437 | ) | $ | (689 | ) | $ | (2,412 | ) |  | $ | — |  | $ | (2 | ) | $ | (780 | )
Available-for-sale securities |  |  |  |  |  |  |
Balance at beginning of period | $ | 132 |  | $ | (5 | ) | $ | — |  |  | $ | — |  | $ | — |  | $ | — |
Other comprehensive (loss) income (4) | (134 | ) | 137 |  | (5 | ) |  | — |  | — |  | — |
Transfer to Alcoa Corporation | — |  | — |  | — |  |  | — |  | — |  | — |
Balance at end of period | $ | (2 | ) | $ | 132 |  | $ | (5 | ) |  | $ | — |  | $ | — |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |
Balance at beginning of period | $ | (1 | ) | $ | 597 |  | $ | (230 | ) |  | — |  | $ | (3 | ) | $ | (2 | )
Other comprehensive income (loss): |  |  |  |  |  |  |
Net change from periodic revaluations | 37 |  | (843 | ) | 1,138 |  |  | — |  | 36 |  | (1 | )
Tax (expense) benefit | (9 | ) | 252 |  | (340 | ) |  | — |  | (10 | ) | — |
Total Other comprehensive income (loss) before reclassifications, net of tax | 28 |  | (591 | ) | 798 |  |  | — |  | 26 |  | (1 | )
Net amount reclassified to earnings: |  |  |  |  |  |  |
Aluminum contracts(5) | (2 | ) | 1 |  | 21 |  |  | — |  | — |  | — |
Energy contracts(6) | — |  | (49 | ) | 6 |  |  | — |  | (34 | ) | — |
Foreign exchange contracts(5) | — |  | — |  | 5 |  |  | — |  | — |  | — |
Interest rate contracts(7) | — |  | 9 |  | 1 |  |  | — |  | 5 |  | — |
Nickel contracts(6) | (1 | ) | 1 |  | 2 |  |  | — |  | — |  | — |
Sub-total | (3 | ) | (38 | ) | 35 |  |  | — |  | (29 | ) | — |
Tax benefit (expense)(2) | 1 |  | 12 |  | (6 | ) |  | — |  | 8 |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(8) | (2 | ) | (26 | ) | 29 |  |  | — |  | (21 | ) | — |
Total Other comprehensive income (loss) | 26 |  | (617 | ) | 827 |  |  | — |  | 5 |  | (1 | )
Transfer to Alcoa Corporation | — |  | 19 |  | — |  |  | — |  | (2 | ) | — |
Balance at end of period | $ | 25 |  | $ | (1 | ) | $ | 597 |  |  | $ | — |  | $ | — |  | $ | (3 | )
(1) | These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note T).
(2) | These amounts were included in Provision for income taxes on the accompanying Statement of Consolidated Operations.
(3) | In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.
(4) | Realized gains and losses were included in Other income, net on the accompanying Statement of Consolidated Operations.
(5) | These amounts were included in Sales on the accompanying Statement of Consolidated Operations.
(6) | These amounts were included in Cost of goods sold on the accompanying Statement of Consolidated Operations.
(7) | These amounts were included in Interest expense on the accompanying Statement of Consolidated Operations.
(8) | A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings. These amounts were reflected on the accompanying Statement of Consolidated Operations in the line items indicated in footnotes 1 through 7.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + 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 + Details
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