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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2020
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:
| Third quarter ended |  |  | Nine months ended
| September 30, |  |  | September 30,
| 2020 |  | 2019 |  |  | 2020 |  | 2019
Pension and other postretirement benefits (G) |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (866) |  |  | $ | (2,281) |  |  |  | $ | (2,732) |  |  | $ | (2,344) |
Other comprehensive income: |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | (7) |  |  | (6) |  |  |  | (66) |  |  | 60 |
Tax expense | 3 |  |  | 2 |  |  |  | 11 |  |  | (13) |
Total Other comprehensive income (loss) before reclassifications, net of tax | (4) |  |  | (4) |  |  |  | (55) |  |  | 47 |
Amortization of net actuarial loss and prior service cost(1) | 16 |  |  | 39 |  |  |  | 133 |  |  | 54 |
Tax (expense) benefit (2) | (4) |  |  | (9) |  |  |  | (24) |  |  | (12) |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(3) | 12 |  |  | 30 |  |  |  | 109 |  |  | 42 |
Total Other comprehensive income | 8 |  |  | 26 |  |  |  | 54 |  |  | 89 |
Transfer to Arconic Corporation | $ | (22) |  |  | — |  |  |  | $ | 1,798 |  |  | — |
Balance at end of period | $ | (880) |  |  | $ | (2,255) |  |  |  | $ | (880) |  |  | $ | (2,255) |
Foreign currency translation |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (1,097) |  |  | $ | (587) |  |  |  | $ | (596) |  |  | $ | (583) |
Foreign currency translation | 48 |  |  | (87) |  |  |  | (39) |  |  | (91) |
Net amount reclassified from Accumulated other comprehensive loss(4) | — |  |  | — |  |  |  | 14 |  |  | — |
Other comprehensive income (loss) | 48 |  |  | (87) |  |  |  | (25) |  |  | (91) |
Transfer to Arconic Corporation | — |  |  | — |  |  |  | (428) |  |  | — |
Balance at end of period | $ | (1,049) |  |  | $ | (674) |  |  |  | $ | (1,049) |  |  | $ | (674) |
Available-for-sale securities |  |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  |  | $ | — |  |  |  | $ | — |  |  | $ | (3) |
Other comprehensive income (loss)(5) | — |  |  | 1 |  |  |  | — |  |  | 4 |
Balance at end of period | $ | — |  |  | $ | 1 |  |  |  | $ | — |  |  | $ | 1 |
Cash flow hedges |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (5) |  |  | $ | (1) |  |  |  | $ | (1) |  |  | $ | 4 |
Adoption of accounting standard | — |  |  | — |  |  |  | — |  |  | (2) |
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Net change from periodic revaluations | 2 |  |  | — |  |  |  | (6) |  |  | (5) |
Tax expense | 2 |  |  | — |  |  |  | 2 |  |  | 2 |
Total Other comprehensive income (loss) before reclassifications, net of tax | 4 |  |  | — |  |  |  | (4) |  |  | (3) |
Net amount reclassified to earnings | 2 |  |  | 2 |  |  |  | 6 |  |  | 1 |
Tax expense(2) | (1) |  |  | (1) |  |  |  | (1) |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(3) | 1 |  |  | 1 |  |  |  | 5 |  |  | 1 |
Total Other comprehensive income (loss) | 5 |  |  | 1 |  |  |  | 1 |  |  | (2) |
Balance at end of period | $ | — |  |  | $ | — |  |  |  | $ | — |  |  | $ | — |
Accumulated other comprehensive loss | $ | (1,929) |  |  | $ | (2,928) |  |  |  | $ | (1,929) |  |  | $ | (2,928) |
(1)These amounts were recorded in Other expense, net (see Note F). (2)These amounts were included in Provision (benefit) for income taxes on the Statement of Consolidated Operations. (3)A positive amount indicates a charge to earnings and a negative amount indicates a benefit to earnings. (4)Foreign currency translation charges were included in Restructuring and other charges on the Statement of Consolidated Operations due to the sale of foreign entities. (5)Realized gains and losses were included in Other expense, net on the Statement of Consolidated Operations.

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