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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 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 |
|  | Second quarter ended June 30, |  |  | Second quarter ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Pension and other postretirement benefits (M) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1,979 | ) |  | $ | (3,579 | ) |  | $ | — |  |  | $ | (55 | )
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost |  |  | 17 |  |  |  | (5 | ) |  |  | — |  |  |  | 1 |
Tax (expense) benefit |  |  | (5 | ) |  |  | 3 |  |  |  | — |  |  |  | — |
Total Other comprehensive loss before reclassifications, net of tax |  |  | 12 |  |  |  | (2 | ) |  |  | — |  |  |  | 1 |
Amortization of net actuarial loss and prior service cost(1) |  |  | 56 |  |  |  | 104 |  |  |  | — |  |  |  |  |
Tax (expense) benefit(2) |  |  | (20 | ) |  |  | (37 | ) |  |  | — |  |  |  | 1 |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | 36 |  |  |  | 67 |  |  |  | — |  |  |  | 1 |
Total Other comprehensive income |  |  | 48 |  |  |  | 65 |  |  |  | — |  |  |  | 2 |
Balance at end of period |  | $ | (1,931 | ) |  | $ | (3,514 | ) |  | $ | — |  |  | $ | (53 | )
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (622 | ) |  | $ | (2,109 | ) |  | $ | (2 | ) |  | $ | (673 | )
Other comprehensive income(3) |  |  | 99 |  |  |  | 45 |  |  |  | — |  |  |  | 32 |
Balance at end of period |  | $ | (523 | ) |  | $ | (2,064 | ) |  | $ | (2 | ) |  | $ | (641 | )
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 99 |  |  | $ | (4 | ) |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income(4) |  |  | (101 | ) |  |  | 3 |  |  |  | — |  |  |  | — |
Balance at end of period |  | $ | (2 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 4 |  |  | $ | 517 |  |  | $ | — |  |  | $ | (5 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from periodic revaluations |  |  | (4 | ) |  |  | (225 | ) |  |  | — |  |  |  | 18 |
Tax benefit (expense) |  |  | 1 |  |  |  | 66 |  |  |  | — |  |  |  | (5 | )
Total Other comprehensive income (loss) before reclassifications, net of tax |  |  | (3 | ) |  |  | (159 | ) |  |  | — |  |  |  | 13 |
Net amount reclassified to earnings |  |  | 1 |  |  |  | 7 |  |  |  |  |  |  |  | 5 |
Tax expense(2) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (2 | )
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | 1 |  |  |  | 6 |  |  |  | — |  |  |  | 3 |
Total Other comprehensive income (loss) |  |  | (2 | ) |  |  | (153 | ) |  |  | — |  |  |  | 16 |
Balance at end of period |  | $ | 2 |  |  | $ | 364 |  |  | $ | — |  |  | $ | 11 |
(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 |
|  | Six months ended June 30, |  |  | Six months ended June 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Pension and other postretirement benefits (M) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (2,010 | ) |  | $ | (3,611 | ) |  | $ | — |  |  | $ | (56 | )
Other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost |  |  | 11 |  |  |  | (64 | ) |  |  | — |  |  |  | 1 |
Tax (expense) benefit |  |  | (4 | ) |  |  | 26 |  |  |  | — |  |  |  | — |
Total Other comprehensive loss before reclassifications, net of tax |  |  | 7 |  |  |  | (38 | ) |  |  | — |  |  |  | 1 |
Amortization of net actuarial loss and prior service cost(1) |  |  | 111 |  |  |  | 208 |  |  |  | — |  |  |  | 2 |
Tax expense(2) |  |  | (39 | ) |  |  | (73 | ) |  |  | — |  |  |  | — |
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | 72 |  |  |  | 135 |  |  |  | — |  |  |  | 2 |
Total Other comprehensive income |  |  | 79 |  |  |  | 97 |  |  |  | — |  |  |  | 3 |
Balance at end of period |  | $ | (1,931 | ) |  | $ | (3,514 | ) |  | $ | — |  |  | $ | (53 | )
Foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (689 | ) |  | $ | (2,412 | ) |  | $ | (2 | ) |  | $ | (780 | )
Other comprehensive income(3) |  |  | 166 |  |  |  | 348 |  |  |  | — |  |  |  | 139 |
Balance at end of period |  | $ | (523 | ) |  | $ | (2,064 | ) |  | $ | (2 | ) |  | $ | (641 | )
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 132 |  |  | $ | (5 | ) |  | $ | — |  |  | $ | — |
Other comprehensive (loss) income(4) |  |  | (134 | ) |  |  | 4 |  |  |  | — |  |  |  | — |
Balance at end of period |  | $ | (2 | ) |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (1 | ) |  | $ | 597 |  |  | $ | — |  |  | $ | (3 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net change from periodic revaluations |  |  | 4 |  |  |  | (342 | ) |  |  | — |  |  |  | 15 |
Tax (expense) benefit |  |  | (2 | ) |  |  | 103 |  |  |  | — |  |  |  | (4 | )
Total Other comprehensive income (loss) before reclassifications, net of tax |  |  | 2 |  |  |  | (239 | ) |  |  | — |  |  |  | 11 |
Net amount reclassified to earnings |  |  | 1 |  |  |  | 5 |  |  |  |  |  |  |  | 5 |
Tax benefit (expense)(2) |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | (2 | )
Total amount reclassified from Accumulated other comprehensive loss, net of tax(5) |  |  | 1 |  |  |  | 6 |  |  |  | — |  |  |  | 3 |
Total Other comprehensive income (loss) |  |  | 3 |  |  |  | (233 | ) |  |  | — |  |  |  | 14 |
Balance at end of period |  | $ | 2 |  |  | $ | 364 |  |  | $ | — |  |  | $ | 11 |
(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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