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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2017
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 |  |  | Third quarter ended |
|  | September 30, |  |  | September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Pension and other postretirement benefits (M) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1,931 | ) |  | $ | (3,514 | ) |  | $ | — |  |  | $ | (53 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost |  |  | (7 | ) |  |  | (819 | ) |  |  | — |  |  |  | (1 | )
Tax benefit |  |  | 1 |  |  |  | 286 |  |  |  | — |  |  |  | — |
Total Other comprehensive loss before reclassifications, net of tax |  |  | (6 | ) |  |  | (533 | ) |  |  | — |  |  |  | (1 | )
Amortization of net actuarial loss and prior service cost(1) |  |  | 56 |  |  |  | 109 |  |  |  | — |  |  |  | 1 |
Tax expense(2) |  |  | (19 | ) |  |  | (38 | ) |  |  | — |  |  |  | (1 | )
Total amount reclassified from Accumulated other comprehensive income, net of tax(5) |  |  | 37 |  |  |  | 71 |  |  |  | — |  |  |  | — |
Total Other comprehensive income (loss) |  |  | 31 |  |  |  | (462 | ) |  |  | — |  |  |  | (1 | )
Balance at end of period |  | $ | (1,900 | ) |  | $ | (3,976 | ) |  | $ | — |  |  | $ | (54 | )
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (523 | ) |  | $ | (2,064 | ) |  | $ | (2 | ) |  | $ | (641 | )
Other comprehensive income(3) |  |  | 85 |  |  |  | 157 |  |  |  | — |  |  |  | 45 |
Balance at end of period |  | $ | (438 | ) |  | $ | (1,907 | ) |  | $ | (2 | ) |  | $ | (596 | )
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (2 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Other comprehensive income(4) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |
Balance at end of period |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 2 |  |  | $ | 364 |  |  | $ | — |  |  | $ | 11 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from periodic revaluations |  |  | 15 |  |  |  | (430 | ) |  |  | — |  |  |  | 20 |
Tax (expense) benefit |  |  | (5 | ) |  |  | 126 |  |  |  | — |  |  |  | (6 | )
Total Other comprehensive income (loss) before reclassifications, net of tax |  |  | 10 |  |  |  | (304 | ) |  |  | — |  |  |  | 14 |
Net amount reclassified to earnings |  |  | — |  |  |  | (46 | ) |  |  | — |  |  |  | (34 | )
Tax benefit (2) |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | 10 |
Total amount reclassified from Accumulated other comprehensive loss, net of tax (5) |  |  | — |  |  |  | (34 | ) |  |  | — |  |  |  | (24 | )
Total Other comprehensive income (loss) |  |  | 10 |  |  |  | (338 | ) |  |  | — |  |  |  | (10 | )
Balance at end of period |  | $ | 12 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 1 |
(1) | These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note M).
(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 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. These amounts were reflected on the accompanying Statement of Consolidated Operations in the line items indicated in footnotes 2 through 4.
|  | Arconic |  |  | Noncontrolling Interests |
|  | Nine months ended |  |  | Nine months ended |
|  | September 30, |  |  | September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Pension and other postretirement benefits (M) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (2,010 | ) |  | $ | (3,611 | ) |  | $ | — |  |  | $ | (56 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost |  |  | 4 |  |  |  | (883 | ) |  |  | — |  |  |  | — |
Tax (expense) benefit |  |  | (3 | ) |  |  | 312 |  |  |  | — |  |  |  | — |
Total Other comprehensive income (loss) before reclassifications, net of tax |  |  | 1 |  |  |  | (571 | ) |  |  | — |  |  |  | — |
Amortization of net actuarial loss and prior service cost(1) |  |  | 167 |  |  |  | 317 |  |  |  | — |  |  |  | 3 |
Tax expense(2) |  |  | (58 | ) |  |  | (111 | ) |  |  | — |  |  |  | (1 | )
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | 109 |  |  |  | 206 |  |  |  | — |  |  |  | 2 |
Total Other comprehensive income (loss) |  |  | 110 |  |  |  | (365 | ) |  |  | — |  |  |  | 2 |
Balance at end of period |  | $ | (1,900 | ) |  | $ | (3,976 | ) |  | $ | — |  |  | $ | (54 | )
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (689 | ) |  | $ | (2,412 | ) |  | $ | (2 | ) |  | $ | (780 | )
Other comprehensive income(3) |  |  | 251 |  |  |  | 505 |  |  |  | — |  |  |  | 184 |
Balance at end of period |  | $ | (438 | ) |  | $ | (1,907 | ) |  | $ | (2 | ) |  | $ | (596 | )
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 132 |  |  | $ | (5 | ) |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income(4) |  |  | (133 | ) |  |  | 4 |  |  |  | — |  |  |  | — |
Balance at end of period |  | $ | (1 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1 | ) |  | $ | 597 |  |  | $ | — |  |  | $ | (3 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from periodic revaluations |  |  | 20 |  |  |  | (772 | ) |  |  | — |  |  |  | 35 |
Tax (expense) benefit |  |  | (7 | ) |  |  | 229 |  |  |  | — |  |  |  | (10 | )
Total Other comprehensive income (loss) before reclassifications, net of tax |  |  | 13 |  |  |  | (543 | ) |  |  | — |  |  |  | 25 |
Net amount reclassified to earnings |  |  | — |  |  |  | (41 | ) |  |  | — |  |  |  | (29 | )
Tax benefit2) |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | 8 |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | — |  |  |  | (28 | ) |  |  | — |  |  |  | (21 | )
Total Other comprehensive income (loss) |  |  | 13 |  |  |  | (571 | ) |  |  | — |  |  |  | 4 |
Balance at end of period |  | $ | 12 |  |  | $ | 26 |  |  | $ | — |  |  | $ | 1 |
(1) | These amounts were included in the computation of net periodic benefit cost for pension and other postretirement benefits (see Note M).
(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 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. These amounts were reflected on the accompanying Statement of Consolidated Operations in the line items indicated in footnotes 2 through 4.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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