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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 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
Third quarter ended September 30, | 2018 |  | 2017 |  | 2018 |  | 2017
Pension and other postretirement benefits (G) |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,058 | ) |  | $ | (1,931 | ) |  | $ | — |  |  | $ | — |
Other comprehensive income: |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 30 |  |  | (7 | ) |  | — |  |  | — |
Tax (expense) benefit | (7 | ) |  | 1 |  |  | — |  |  | — |
Total Other comprehensive income (loss) before reclassifications, net of tax | 23 |  |  | (6 | ) |  | — |  |  | — |
Amortization of net actuarial loss and prior service cost(1) | 18 |  |  | 56 |  |  | — |  |  | — |
Tax expense(2) | (4 | ) |  | (19 | ) |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) | 14 |  |  | 37 |  |  | — |  |  | — |
Total Other comprehensive income | 37 |  |  | 31 |  |  | — |  |  | — |
Balance at end of period | $ | (2,021 | ) |  | $ | (1,900 | ) |  | $ | — |  |  | $ | — |
Foreign currency translation |  |  |  |  |  |  |
Balance at beginning of period | $ | (516 | ) |  | $ | (523 | ) |  | $ | — |  |  | $ | (2 | )
Other comprehensive (loss) income(3) | (16 | ) |  | 85 |  |  | — |  |  | — |
Balance at end of period | $ | (532 | ) |  | $ | (438 | ) |  | $ | — |  |  | $ | (2 | )
Available-for-sale securities |  |  |  |  |  |  |
Balance at beginning of period | $ | (4 | ) |  | $ | (2 | ) |  | $ | — |  |  | $ | — |
Other comprehensive income(4) | 1 |  |  | 1 |  |  | — |  |  | — |
Balance at end of period | $ | (3 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |
Balance at beginning of period | $ | 22 |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income: |  |  |  |  |  |  |
Net change from periodic revaluations | (7 | ) |  | 15 |  |  | — |  |  | — |
Tax benefit (expense) | 1 |  |  | (5 | ) |  | — |  |  | — |
Total Other comprehensive (loss) income before reclassifications, net of tax | (6 | ) |  | 10 |  |  | — |  |  | — |
Net amount reclassified to earnings | (5 | ) |  | — |  |  | — |  |  | — |
Tax benefit(2) | 1 |  |  | — |  |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive income, net of tax(5) | (4 | ) |  | — |  |  | — |  |  | — |
Total Other comprehensive (loss) income | (10 | ) |  | 10 |  |  | — |  |  | — |
Balance at end of period | $ | 12 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |
Total balance at end of period | $ | (2,544 | ) |  | $ | (2,327 | ) |  | $ | — |  |  | $ | (2 | )
(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.
| Arconic |  | Noncontrolling Interests
Nine months ended September 30, | 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 | 152 |  |  | 4 |  |  | — |  |  | — |
Tax expense | (35 | ) |  | (3 | ) |  | — |  |  | — |
Total Other comprehensive income before reclassifications, net of tax | 117 |  |  | 1 |  |  | — |  |  | — |
Amortization of net actuarial loss and prior service cost(1) | 118 |  |  | 167 |  |  | — |  |  | — |
Tax expense(2) | (26 | ) |  | (58 | ) |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) | 92 |  |  | 109 |  |  | — |  |  | — |
Total Other comprehensive income | 209 |  |  | 110 |  |  | — |  |  | — |
Balance at end of period | $ | (2,021 | ) |  | $ | (1,900 | ) |  | $ | — |  |  | $ | — |
Foreign currency translation |  |  |  |  |  |  |
Balance at beginning of period | $ | (437 | ) |  | $ | (689 | ) |  | $ | — |  |  | $ | (2 | )
Other comprehensive (loss) income(3) | (95 | ) |  | 251 |  |  | — |  |  | — |
Balance at end of period | $ | (532 | ) |  | $ | (438 | ) |  | $ | — |  |  | $ | (2 | )
Available-for-sale securities |  |  |  |  |  |  |
Balance at beginning of period | $ | (2 | ) |  | $ | 132 |  |  | $ | — |  |  | $ | — |
Other comprehensive loss(4) | (1 | ) |  | (133 | ) |  | — |  |  | — |
Balance at end of period | $ | (3 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |
Balance at beginning of period | $ | 25 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income: |  |  |  |  |  |  |
Net change from periodic revaluations | (4 | ) |  | 20 |  |  | — |  |  | — |
Tax benefit (expense) | 1 |  |  | (7 | ) |  | — |  |  | — |
Total Other comprehensive (loss) income before reclassifications, net of tax | (3 | ) |  | 13 |  |  | — |  |  | — |
Net amount reclassified to earnings | (12 | ) |  | — |  |  | — |  |  | — |
Tax benefit(2) | 2 |  |  | — |  |  | — |  |  | — |
Total amount reclassified from Accumulated other comprehensive income, net of tax(5) | (10 | ) |  | — |  |  | — |  |  | — |
Total Other comprehensive (loss) income | (13 | ) |  | 13 |  |  | — |  |  | — |
Balance at end of period | $ | 12 |  |  | $ | 12 |  |  | $ | — |  |  | $ | — |
Total balance at end of period | $ | (2,544 | ) |  | $ | (2,327 | ) |  | $ | — |  |  | $ | (2 | )
(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://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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