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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2018
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
First quarter ended March 31, | 2018 |  | 2017 |  | 2018 |  | 2017
Pension and other postretirement benefits (G) |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,230 | ) |  | $ | (2,010 | ) |  | $ | — |  |  | $ | — |
Other comprehensive income: |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 137 |  |  | (6 | ) |  | — |  |  | — |
Tax (expense) benefit | (31 | ) |  | 1 |  |  | — |  |  | — |
Total Other comprehensive income (loss) before reclassifications, net of tax | 106 |  |  | (5 | ) |  | — |  |  | — |
Amortization of net actuarial loss and prior service cost(1) | 48 |  |  | 55 |  |  | — |  |  | — |
Tax expense(2) | (11 | ) |  | (19 | ) |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) | 37 |  |  | 36 |  |  | — |  |  | — |
Total Other comprehensive income | 143 |  |  | 31 |  |  | — |  |  | — |
Balance at end of period | $ | (2,087 | ) |  | $ | (1,979 | ) |  | $ | — |  |  | $ | — |
Foreign currency translation |  |  |  |  |  |  |
Balance at beginning of period | $ | (437 | ) |  | $ | (689 | ) |  | $ | — |  |  | $ | (2 | )
Other comprehensive income(3) | 122 |  |  | 67 |  |  | — |  |  | — |
Balance at end of period | $ | (315 | ) |  | $ | (622 | ) |  | $ | — |  |  | $ | (2 | )
Available-for-sale securities |  |  |  |  |  |  |
Balance at beginning of period | $ | (2 | ) |  | $ | 132 |  |  | $ | — |  |  | $ | — |
Other comprehensive loss (4) | — |  |  | (33 | ) |  | — |  |  | — |
Balance at end of period | $ | (2 | ) |  | $ | 99 |  |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |
Balance at beginning of period | $ | 25 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income: |  |  |  |  |  |  |
Net change from periodic revaluations | (6 | ) |  | 8 |  |  | — |  |  | — |
Tax benefit (expense) | 1 |  |  | (3 | ) |  | — |  |  | — |
Total Other comprehensive (loss) income before reclassifications, net of tax | (5 | ) |  | 5 |  |  | — |  |  | — |
Net amount reclassified to earnings | (3 | ) |  | — |  |  | — |  |  | — |
Tax benefit (2) | 1 |  |  | — |  |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax (5) | (2 | ) |  | — |  |  | — |  |  | — |
Total Other comprehensive (loss) income | (7 | ) |  | 5 |  |  | — |  |  | — |
Balance at end of period | $ | 18 |  |  | $ | 4 |  |  | $ | — |  |  | $ | — |
(1) | These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note G).
(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 expense (income), net on the accompanying Statement of Consolidated Operations.
(5) | A positive amount indicates a corresponding charge to earnings and a negative amount indicates a corresponding benefit to earnings.

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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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