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Financial Instruments | 12 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Financial Instruments Disclosure | Financial InstrumentsFair Value—Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The fair value hierarchy distinguishes between (i) market participant assumptions developed based on market data obtained from independent sources (observable inputs) and (ii) an entity’s own assumptions about market participant assumptions developed based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: •Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. •Level 2—Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means. •Level 3—Inputs that are both significant to the fair value measurement and unobservable. The respective carrying value and fair value of Arconic’s financial instruments were as follows:
|  | 2021 |  | 2020
December 31, |  | Carrying value |  | Fair value |  | Carrying value |  | Fair value
Cash and cash equivalents |  | $ | 335 |  |  | $ | 335 |  |  | $ | 787 |  |  | $ | 787 |
Derivative instruments - assets |  | 1 |  |  | 1 |  |  | 3 |  |  | 3 |
Short-term borrowings |  | — |  |  | — |  |  | 14 |  |  | 14 |
Derivatives instruments - liabilities |  | 23 |  |  | 23 |  |  | 2 |  |  | 2 |
Long-term debt |  | 1,594 |  |  | 1,692 |  |  | 1,278 |  |  | 1,399 |
The following methods were used to estimate the fair value of financial instruments: Cash and cash equivalents and Short-term borrowings. The carrying amounts approximate fair value because of the short maturity of the instruments. The fair value amounts for Cash and cash equivalents were classified in Level 1 of the fair value hierarchy and Short-term borrowings were classified in Level 2 of the fair value hierarchy. Derivative instruments. The fair value of financial instruments that hedge forward sale commitments for aluminum and forward purchase commitments for aluminum, natural gas, and certain alloying materials was based on quoted market prices (e.g., aluminum prices on the 10-year London Metal Exchange forward curve) or other significant observable inputs (e.g., regional premiums for aluminum contracts) and were classified in Level 1 or Level 2 of the fair value hierarchy. Long-term debt. The fair value was based on quoted market prices for public debt and were classified in Level 2 of the fair value hierarchy.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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