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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2019
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:
First quarter ended March 31, | 2019 |  | 2018
Pension and other postretirement benefits (F) |  |  |
Balance at beginning of period | $ | (2,344 | ) |  | $ | (2,230 | )
Other comprehensive income: |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 72 |  |  | 137 |
Tax expense | (16 | ) |  | (31 | )
Total Other comprehensive income before reclassifications, net of tax | 56 |  |  | 106 |
Amortization of net actuarial loss and prior service cost(1) | (21 | ) |  | 48 |
Tax benefit (expense)(2) | 5 |  |  | (11 | )
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) | (16 | ) |  | 37 |
Total Other comprehensive income | 40 |  |  | 143 |
Balance at end of period | $ | (2,304 | ) |  | $ | (2,087 | )
Foreign currency translation |  |  |
Balance at beginning of period | $ | (583 | ) |  | $ | (437 | )
Other comprehensive income(3) | 26 |  |  | 122 |
Balance at end of period | $ | (557 | ) |  | $ | (315 | )
Available-for-sale securities |  |  |
Balance at beginning of period | $ | (3 | ) |  | $ | (2 | )
Other comprehensive income(4) | 3 |  |  | — |
Balance at end of period | $ | — |  |  | $ | (2 | )
Cash flow hedges |  |  |
Balance at beginning of period | $ | 4 |  |  | $ | 25 |
Adoption of accounting standards (B) | (2 | ) |  | — |
Other comprehensive income (loss): |  |  |
Net change from periodic revaluations | 8 |  |  | (6 | )
Tax (expense) benefit | (1 | ) |  | 1 |
Total Other comprehensive income (loss) before reclassifications, net of tax | 7 |  |  | (5 | )
Net amount reclassified to earnings | — |  |  | (3 | )
Tax benefit(2) | — |  |  | 1 |
Total amount reclassified from Accumulated other comprehensive income, net of tax(5) | — |  |  | (2 | )
Total Other comprehensive income (loss) | 7 |  |  | (7 | )
Balance at end of period | $ | 9 |  |  | $ | 18 |
Total balance at end of period | $ | (2,852 | ) |  | $ | (2,386 | )
(1) | These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note F).
(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, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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