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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Jan. 01, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,585 | $ 4,924 |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive income, net of tax | 76 | 258 |  |
Adoption of accounting standards (B) |  |  | $ 73 |
Balance at end of period | 5,178 | 5,282 |  |
Arconic |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,926) | (2,644) |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive income, net of tax | 76 | 258 |  |
Adoption of accounting standards (B) |  |  | (2) |
Balance at end of period | (2,852) | (2,386) |  |
Pension and other postretirement benefits (F) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,344) | (2,230) |  |
Other comprehensive income: |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 72 | 137 |  |
Tax (expense) benefit | (16) | (31) |  |
Total Other comprehensive income before reclassifications, net of tax | 56 | 106 |  |
Amortization of net actuarial loss and prior service cost | (21) | 48 |  |
Tax benefit (expense) | 5 | (11) |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | (16) | 37 |  |
Total Other comprehensive income, net of tax | 40 | 143 |  |
Balance at end of period | (2,304) | (2,087) |  |
Foreign currency translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (583) | (437) |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive income, net of tax | 26 | 122 |  |
Balance at end of period | (557) | (315) |  |
Available-for-sale securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (3) | (2) |  |
Other comprehensive income: |  |  |  |
Total Other comprehensive income, net of tax | 3 | 0 |  |
Balance at end of period | 0 | (2) |  |
Cash flow hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 4 | 25 |  |
Other comprehensive income: |  |  |  |
Unrecognized net actuarial loss and prior service cost/benefit | 8 | (6) |  |
Tax (expense) benefit | (1) | 1 |  |
Total Other comprehensive income before reclassifications, net of tax | 7 | (5) |  |
Amortization of net actuarial loss and prior service cost | 0 | (3) |  |
Tax benefit (expense) | 0 | 1 |  |
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | (2) |  |
Total Other comprehensive income, net of tax | 7 | (7) |  |
Balance at end of period | $ 9 | $ 18 |  |
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) |  |  | $ (2) | $ 0

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