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Other Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Carrying Values and Fair Values of Other Financial Instruments | The carrying values and fair values of Arconic’s financial instruments were as follows:
| 2017 |  | 2016
December 31, | Carrying value | Fair value |  | Carrying value | Fair value
Cash and cash equivalents | $ | 2,150 |  | $ | 2,150 |  |  | $ | 1,863 |  | $ | 1,863 |
Restricted cash | 4 |  | 4 |  |  | 15 |  | 15 |
Derivatives – current asset | 61 |  | 61 |  |  | 14 |  | 14 |
Noncurrent receivables | 20 |  | 20 |  |  | 21 |  | 21 |
Derivatives – noncurrent asset | 33 |  | 33 |  |  | 10 |  | 10 |
Available-for-sale securities | 106 |  | 106 |  |  | 102 |  | 102 |
Investment in common stock of Alcoa Corporation | — |  | — |  |  | 1,020 |  | 1,020 |
Short-term debt | 38 |  | 38 |  |  | 40 |  | 40 |
Derivatives – current liability | 45 |  | 45 |  |  | 5 |  | 5 |
Commercial paper | — |  | — |  |  | — |  | — |
Derivatives – noncurrent liability | 14 |  | 14 |  |  | 3 |  | 3 |
Contingent payment related to an acquisition | — |  | — |  |  | 78 |  | 78 |
Long-term debt, less amount due within one year | 6,806 |  | 7,443 |  |  | 8,044 |  | 8,519 |

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