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Accumulated Other Comprehensive Loss - Summary of Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pension and other postretirement benefits |  |  |  |
Total Other comprehensive income (loss) | $ 31 | $ (463) | $ 110 | $ (363)
Foreign currency translation |  |  |  |
Other comprehensive income | 85 | 202 | 251 | 689
Available-for-sale securities |  |  |  |
Other comprehensive (loss) income | 1 |  | (133) | 4
Cash flow hedges |  |  |  |
Total Other comprehensive income (loss) | 10 | (348) | 13 | (567)
Arconic [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period | (1,931) | (3,514) | (2,010) | (3,611)
Unrecognized net actuarial loss and prior service cost | (7) | (819) | 4 | (883)
Tax (expense) benefit | 1 | 286 | (3) | 312
Total Other comprehensive income (loss) before reclassifications, net of tax | (6) | (533) | 1 | (571)
Amortization of net actuarial loss and prior service cost | 56 | 109 | 167 | 317
Tax (expense) benefit | (19) | (38) | (58) | (111)
Total amount reclassified from Accumulated other comprehensive loss, net of tax | 37 | 71 | 109 | 206
Total Other comprehensive income (loss) | 31 | (462) | 110 | (365)
Balance at end of period | (1,900) | (3,976) | (1,900) | (3,976)
Foreign currency translation |  |  |  |
Balance at beginning of period | (523) | (2,064) | (689) | (2,412)
Other comprehensive income | 85 | 157 | 251 | 505
Balance at end of period | (438) | (1,907) | (438) | (1,907)
Available-for-sale securities |  |  |  |
Balance at beginning of period | (2) | (1) | 132 | (5)
Other comprehensive (loss) income | 1 |  | (133) | 4
Balance at end of period | (1) | (1) | (1) | (1)
Cash flow hedges |  |  |  |
Balance at beginning of period | 2 | 364 | (1) | 597
Net change from periodic revaluations | 15 | (430) | 20 | (772)
Tax (expense) benefit | (5) | 126 | (7) | 229
Total Other comprehensive income (loss) before reclassifications, net of tax | 10 | (304) | 13 | (543)
Net amount reclassified to earnings |  | (46) |  | (41)
Tax benefit |  | 12 |  | 13
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  | (34) |  | (28)
Total Other comprehensive income (loss) | 10 | (338) | 13 | (571)
Balance at end of period | 12 | 26 | 12 | 26
Noncontrolling Interests [Member] |  |  |  |
Pension and other postretirement benefits |  |  |  |
Balance at beginning of period |  | (53) |  | (56)
Unrecognized net actuarial loss and prior service cost |  | (1) |  |
Total Other comprehensive income (loss) before reclassifications, net of tax |  | (1) |  |
Amortization of net actuarial loss and prior service cost |  | 1 |  | 3
Tax (expense) benefit |  | (1) |  | (1)
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  |  |  | 2
Total Other comprehensive income (loss) |  | (1) |  | 2
Balance at end of period |  | (54) |  | (54)
Foreign currency translation |  |  |  |
Balance at beginning of period | (2) | (641) | (2) | (780)
Other comprehensive income |  | 45 |  | 184
Balance at end of period | $ (2) | (596) | $ (2) | (596)
Cash flow hedges |  |  |  |
Balance at beginning of period |  | 11 |  | (3)
Net change from periodic revaluations |  | 20 |  | 35
Tax (expense) benefit |  | (6) |  | (10)
Total Other comprehensive income (loss) before reclassifications, net of tax |  | 14 |  | 25
Net amount reclassified to earnings |  | (34) |  | (29)
Tax benefit |  | 10 |  | 8
Total amount reclassified from Accumulated other comprehensive loss, net of tax |  | (24) |  | (21)
Total Other comprehensive income (loss) |  | (10) |  | 4
Balance at end of period |  | $ 1 |  | $ 1

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