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Accumulated Other Comprehensive Loss | 9 Months Ended
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Sep. 30, 2018
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss 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 The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration