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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Fair Values of Financial Instruments | The following table summarizes Arconic’s financial liabilities that were not carried at fair value at September 30, 2018 and December 31, 2017:
| September 30, 2018 |  | December 31, 2017
| Carrying value |  | Fair value |  | Carrying value |  | Fair value
Long-term debt, less amount due within one year | $ | 6,315 |  |  | $ | 6,495 |  |  | $ | 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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