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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,218 | $ 5,753 | $ 4,924 | $ 5,141
Total Other comprehensive income, net of tax | 12 | 127 | 100 | 241
Balance at end of period | 5,375 | 5,961 | 5,375 | 5,961
Arconic |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,556) | (2,454) | (2,644) | (2,568)
Total Other comprehensive income, net of tax | 12 | 127 | 100 | 241
Balance at end of period | (2,544) | (2,327) | (2,544) | (2,327)
Pension and other postretirement benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (2,058) | (1,931) | (2,230) | (2,010)
Other comprehensive income (loss), before reclassifications, before tax | 30 | (7) | 152 | 4
Tax (expense) benefit | (7) | 1 | (35) | (3)
Total Other comprehensive income (loss) before reclassifications, net of tax | 23 | (6) | 117 | 1
Reclassification from accumulated other comprehensive income, before tax | 18 | 56 | 118 | 167
Tax (expense) benefit | (4) | (19) | (26) | (58)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 14 | 37 | 92 | 109
Total Other comprehensive income, net of tax | 37 | 31 | 209 | 110
Balance at end of period | (2,021) | (1,900) | (2,021) | (1,900)
Foreign currency translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (516) | (523) | (437) | (689)
Total Other comprehensive income, net of tax | (16) | 85 | (95) | 251
Balance at end of period | (532) | (438) | (532) | (438)
Available-for-sale securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (4) | (2) | (2) | 132
Total Other comprehensive income, net of tax | 1 | 1 | (1) | (133)
Balance at end of period | (3) | (1) | (3) | (1)
Cash flow hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 22 | 2 | 25 | (1)
Other comprehensive income (loss), before reclassifications, before tax | (7) | 15 | (4) | 20
Tax (expense) benefit | 1 | (5) | 1 | (7)
Total Other comprehensive income (loss) before reclassifications, net of tax | (6) | 10 | (3) | 13
Reclassification from accumulated other comprehensive income, before tax | (5) | 0 | (12) | 0
Tax (expense) benefit | 1 | 0 | 2 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | (4) | 0 | (10) | 0
Total Other comprehensive income, net of tax | (10) | 10 | (13) | 13
Balance at end of period | 12 | 12 | 12 | 12
Noncontrolling Interests |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at end of period | 0 | (2) | 0 | (2)
Pension and other postretirement benefits |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | 0
Other comprehensive income (loss), before reclassifications, before tax | 0 | 0 | 0 | 0
Tax (expense) benefit | 0 | 0 | 0 | 0
Total Other comprehensive income (loss) before reclassifications, net of tax | 0 | 0 | 0 | 0
Reclassification from accumulated other comprehensive income, before tax | 0 | 0 | 0 | 0
Tax (expense) benefit | 0 | 0 | 0 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Total Other comprehensive income, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0 | 0
Foreign currency translation |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | (2) | 0 | (2)
Total Other comprehensive income, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 0 | (2) | 0 | (2)
Available-for-sale securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | 0
Total Other comprehensive income, net of tax | 0 | 0 | 0 | 0
Balance at end of period | 0 | 0 | 0 | 0
Cash flow hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 0 | 0 | 0
Other comprehensive income (loss), before reclassifications, before tax | 0 | 0 | 0 | 0
Tax (expense) benefit | 0 | 0 | 0 | 0
Total Other comprehensive income (loss) before reclassifications, net of tax | 0 | 0 | 0 | 0
Reclassification from accumulated other comprehensive income, before tax | 0 | 0 | 0 | 0
Tax (expense) benefit | 0 | 0 | 0 | 0
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 0 | 0 | 0 | 0
Total Other comprehensive income, net of tax | 0 | 0 | 0 | 0
Balance at end of period | $ 0 | $ 0 | $ 0 | $ 0

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