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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Jan. 01, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 4,621 | $ 5,585 |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive (loss) income, net of tax | (40) | 76 |  |
Foreign currency translation adjustments | (65) | 26 |  |
Adoption of accounting standards |  |  |  | $ 73
Balance at end of period | 4,797 | 5,178 |  |
Arconic |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (3,329) | (2,926) |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive (loss) income, net of tax | (40) | 76 |  |
Adoption of accounting standards |  |  |  | (2)
Balance at end of period | (3,369) | (2,852) |  |
Pension and other postretirement benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,732) | (2,344) |  |
Other comprehensive income: |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 1 | 72 |  |
Tax expense | 0 | (16) |  |
Total Other comprehensive income before reclassifications, net of tax | 1 | 56 |  |
Amortization of net actuarial loss and prior service cost | 43 | (21) |  |
Tax (expense) benefit | (7) | 5 |  |
Amount reclassified from Accumulated other comprehensive loss, net of tax | 36 | (16) |  |
Total Other comprehensive (loss) income, net of tax | 37 | 40 |  |
Balance at end of period | (2,695) | (2,304) |  |
Foreign currency translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (596) | (583) |  |
Other comprehensive income: |  |  |  |
Amount reclassified from Accumulated other comprehensive loss, net of tax | 14 | 0 |  |
Total Other comprehensive (loss) income, net of tax | (65) | 26 |  |
Foreign currency translation adjustments | (79) | 26 |  |
Balance at end of period | (661) | (557) |  |
Available-for-sale securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | (3) |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive (loss) income, net of tax | 1 | 3 |  |
Balance at end of period | 1 | 0 |  |
Cash flow hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (1) | 4 |  |
Other comprehensive income: |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | (11) | 8 |  |
Tax expense | (1) | (1) |  |
Total Other comprehensive income before reclassifications, net of tax | (12) | 7 |  |
Amortization of net actuarial loss and prior service cost | (1) | 0 |  |
Tax (expense) benefit | 0 | 0 |  |
Amount reclassified from Accumulated other comprehensive loss, net of tax | (1) | 0 |  |
Total Other comprehensive (loss) income, net of tax | (13) | 7 |  |
Balance at end of period | $ (14) | $ 9 |  |
Accounting Standards Update 2017-12 | Cash flow hedges |  |  |  |
Other comprehensive income: |  |  |  |
Adoption of accounting standards |  |  | $ 0 | $ (2)

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