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Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments, All Other Investments [Abstract] |
Schedule of Carrying Values and Fair Values of Financial Instruments | The carrying values and fair values of Arconic’s financial instruments were as follows:
|  | September 30, 2017 |  |  | December 31, 2016 |
|  | Carrying value |  |  | Fair value |  |  | Carrying value |  |  | Fair value |
Cash and cash equivalents |  | $ | 1,815 |  |  |  | 1,815 |  |  | $ | 1,863 |  |  | $ | 1,863 |
Restricted cash |  |  | 5 |  |  |  | 5 |  |  |  | 15 |  |  |  | 15 |
Derivatives - current asset |  |  | 41 |  |  |  | 41 |  |  |  | 14 |  |  |  | 14 |
Noncurrent receivables |  |  | 18 |  |  |  | 18 |  |  |  | 21 |  |  |  | 21 |
Derivatives - noncurrent asset |  |  | 24 |  |  |  | 24 |  |  |  | 10 |  |  |  | 10 |
Available-for-sale securities |  |  | 106 |  |  |  | 106 |  |  |  | 102 |  |  |  | 102 |
Investment in common stock of Alcoa Corporation |  |  | — |  |  |  | — |  |  |  | 1,020 |  |  |  | 1,020 |
Short-term borrowings |  |  | 54 |  |  |  | 54 |  |  |  | 36 |  |  |  | 36 |
Derivatives - current liability |  |  | 31 |  |  |  | 31 |  |  |  | 5 |  |  |  | 5 |
Long-term debt due within one year |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 4 |
Derivatives - noncurrent liability |  |  | 11 |  |  |  | 11 |  |  |  | 3 |  |  |  | 3 |
Contingent payment related to an acquisition |  |  | 81 |  |  |  | 81 |  |  |  | 78 |  |  |  | 78 |
Long-term debt, less amount due within one year |  |  | 6,802 |  |  |  | 7,440 |  |  |  | 8,044 |  |  |  | 8,519 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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