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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Apr. 01, 2019 | Jan. 01, 2019 | Apr. 01, 2018 | Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | $ 4,866 | $ 5,218 | $ 5,585 | $ 4,924 |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Total Other comprehensive (loss) income, net of tax | (59) | 12 | 0 | 100 |  |  |  |
Adoption of accounting standards (B) |  |  |  |  |  | $ 73 |  |
Balance at end of period | 4,710 | 5,375 | 4,710 | 5,375 |  |  |  |
Arconic |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | (2,869) | (2,556) | (2,926) | (2,644) |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Total Other comprehensive (loss) income, net of tax | (59) | 12 |  | 100 |  |  |  |
Adoption of accounting standards (B) |  |  |  |  |  | (2) |  |
Balance at end of period | (2,928) | (2,544) | (2,928) | (2,544) |  |  |  |
Pension and other postretirement benefits |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | (2,281) | (2,058) | (2,344) | (2,230) |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | (6) | 30 | 60 | 152 |  |  |  |
Tax benefit (expense) | 2 | (7) | (13) | (35) |  |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | (4) | 23 | 47 | 117 |  |  |  |
Amortization of net actuarial loss and prior service cost | 39 | 18 | 54 | 118 |  |  |  |
Tax expense benefit | (9) | (4) | (12) | (26) |  |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 30 | 14 | 42 | 92 |  |  |  |
Total Other comprehensive (loss) income, net of tax | 26 | 37 | 89 | 209 |  |  |  |
Balance at end of period | (2,255) | (2,021) | (2,255) | (2,021) |  |  |  |
Foreign currency translation |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | (587) | (516) | (583) | (437) |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Total Other comprehensive (loss) income, net of tax | (87) | (16) | (91) | (95) |  |  |  |
Balance at end of period | (674) | (532) | (674) | (532) |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | 0 | (4) | (3) | (2) |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Total Other comprehensive (loss) income, net of tax | 1 | 1 | 4 | (1) |  |  |  |
Balance at end of period | 1 | (3) | 1 | (3) |  |  |  |
Cash flow hedges |  |  |  |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of period | (1) | 22 | 4 | 25 |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 0 | (7) | (5) | (4) |  |  |  |
Tax benefit (expense) | 0 | 1 | 2 | 1 |  |  |  |
Total Other comprehensive (loss) income before reclassifications, net of tax | 0 | (6) | (3) | (3) |  |  |  |
Amortization of net actuarial loss and prior service cost | 2 | (5) | 1 | (12) |  |  |  |
Tax expense benefit | (1) | 1 | 0 | 2 |  |  |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 1 | (4) | 1 | (10) |  |  |  |
Total Other comprehensive (loss) income, net of tax | 1 | (10) | (2) | (13) |  |  |  |
Balance at end of period | $ 0 | $ 12 | $ 0 | $ 12 |  |  |  |
Accounting Standards Update 2017-12 |  |  |  |  |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Adoption of accounting standards (B) |  |  |  |  |  | 2 |  |
Accounting Standards Update 2017-12 | Cash flow hedges |  |  |  |  |  |  |  |
Other comprehensive income: |  |  |  |  |  |  |  |
Adoption of accounting standards (B) |  |  |  |  | $ 0 | $ (2) | $ 0 | $ 0

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