v3.20.2

Accumulated Other Comprehensive Income​ | 9 Months Ended
--- | ---
Sep. 30, 2020
Equity [Abstract] |
Accumulated Other Comprehensive Income​ | Accumulated Other Comprehensive (Loss) Income​ The following table details the activity of the three components that comprise Accumulated other comprehensive (loss) income for Arconic Corporation (such activity for Noncontrolling interest was immaterial for all periods presented):
|  | Third quarter ended September 30, |  | Nine months ended September 30,
|  | 2020 | ​ | 2019 | ​ | 2020 | ​ | 2019
Pension and other postretirement benefits (G) |  |  |  |  | ​ | ​ |  | ​
Balance at beginning of period |  | $ | (1,784) |  |  | $ | (32) |  | ​ | $ | (43) |  |  | $ | (32) |
Establishment of additional defined benefit plans |  | — |  |  | — |  |  | (1,752) |  |  | — |
Separation-related adjustments (A) |  | — |  |  | — |  |  | (50) |  |  | — |
Other comprehensive income: |  |  |  |  | ​ |  |  |
Unrecognized net actuarial loss and prior service benefit |  | 4 |  |  | 1 |  | ​ | (34) |  |  | (1) |
Tax (expense) benefit |  | (1) |  |  | (1) |  | ​ | 8 |  |  | — |
Total Other comprehensive income (loss) before reclassifications, net of tax |  | 3 |  |  | — |  | ​ | (26) |  |  | (1) |
Amortization of net actuarial loss and prior service benefit(1) |  | 36 |  |  | 1 |  | ​ | 153 |  |  | 3 |
Tax expense(2) |  | (8) |  |  | — |  | ​ | (35) |  |  | (1) |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  | 28 |  |  | 1 |  | ​ | 118 |  |  | 2 |
Total Other comprehensive income |  | 31 |  |  | 1 |  | ​ | 92 |  |  | 1 |
Balance at end of period |  | $ | (1,753) |  |  | $ | (31) |  | ​ | $ | (1,753) |  |  | $ | (31) |
Foreign currency translation |  |  |  |  | ​ |  |  |
Balance at beginning of period |  | $ | (53) |  |  | $ | 296 |  | ​ | $ | 338 |  |  | $ | 282 |
Separation-related adjustments (A) |  | — |  |  | — |  |  | (396) |  |  | — |
Other comprehensive income: |  |  |  |  |  |  |  |
Foreign currency translation(3) |  | 37 |  |  | 45 |  |  | 20 |  |  | 59 |
Net amount reclassified to earnings from Accumulated other comprehensive income(3),(5) |  | — |  |  | — |  |  | 22 |  |  | — |
Total Other comprehensive income |  | 37 |  |  | 45 |  | ​ | 42 |  |  | 59 |
Balance at end of period |  | $ | (16) |  |  | $ | 341 |  | ​ | $ | (16) |  |  | $ | 341 |
Cash flow hedges |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (11) |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Separation-related adjustments (A) |  | — |  |  | — |  |  | (4) |  |  | — |
Other comprehensive income: |  |  |  |  |  |  |  |
Net change from periodic revaluations |  | 2 |  |  | — |  |  | 4 |  |  | — |
Tax expense |  | (1) |  |  | — |  |  | (1) |  |  | — |
Total Other comprehensive income before reclassifications, net of tax |  | 1 |  |  | — |  | ​ | 3 |  |  | — |
Net amount reclassified to earnings(4) |  | 14 |  |  | — |  |  | 3 |  |  | — |
Tax expense(2) |  | (3) |  |  | — |  |  | (1) |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  | 11 |  |  | — |  | ​ | 2 |  |  | — |
Total Other comprehensive income |  | 12 |  |  | — |  | ​ | 5 |  |  | — |
Balance at end of period |  | $ | 1 |  |  | $ | — |  | ​ | $ | 1 |  |  | $ | — |
Accumulated other comprehensive (loss) income |  | $ | (1,768) |  |  | $ | 310 |  | ​ | $ | (1,768) |  |  | $ | 310 |
_____________________ (1)These amounts were included in the non-service component of net periodic benefit cost for pension and other postretirement benefits (see Note G). In the 2020 third quarter and nine-month period, these amounts include $3 and $58 related to the settlement of certain pension benefits (see Note G). (2)These amounts were reported 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. In the 2020 nine-month period, the net amount reclassified to earnings was reported in Restructuring and other charges on the accompanying Statement of Consolidated Operations related to the sale of certain foreign subsidiaries. (4)These amounts relate to aluminum contracts, a portion of which were reported in both Sales and Cost of goods sold 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. These amounts were reflected on the accompanying Statement of Consolidated Operations in the line items indicated in footnotes 1 through 4.

X
- 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
Name: | us-gaap_ComprehensiveIncomeNoteTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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