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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [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:
| March 31, 2018 |  | December 31, 2017
| Carrying value |  | Fair value |  | Carrying value |  | Fair value
Cash and cash equivalents | $ | 1,205 |  |  | $ | 1,205 |  |  | $ | 2,150 |  |  | $ | 2,150 |
Restricted cash | 3 |  |  | 3 |  |  | 4 |  |  | 4 |
Derivatives – current asset | 37 |  |  | 37 |  |  | 61 |  |  | 61 |
Noncurrent receivables | 20 |  |  | 20 |  |  | 20 |  |  | 20 |
Derivatives – noncurrent asset | 19 |  |  | 19 |  |  | 33 |  |  | 33 |
Available-for-sale securities | 96 |  |  | 96 |  |  | 106 |  |  | 106 |
Short-term debt | 45 |  |  | 45 |  |  | 38 |  |  | 38 |
Derivatives – current liability | 29 |  |  | 29 |  |  | 45 |  |  | 45 |
Derivatives – noncurrent liability | 8 |  |  | 8 |  |  | 14 |  |  | 14 |
Long-term debt, less amount due within one year | 6,309 |  |  | 6,631 |  |  | 6,806 |  |  | 7,443 |

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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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