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Fair Value of Financial Instruments
6 Months Ended
Jun. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments Fair Value of Financial Instruments
The carrying values of Cash and cash equivalents, Restricted cash, Derivatives, Noncurrent receivables, and Short-term debt included in the Consolidated Balance Sheet approximate their fair value. The Company holds exchange-traded fixed income securities which are considered available-for-sale securities that are carried at fair value which is based on quoted market prices which are classified in Level 1 of the fair value hierarchy. The fair value of Long-term debt, less amount due within one year was based on quoted market prices for public debt and on interest rates that are currently available to Howmet for issuance of debt with similar terms and maturities for non-public debt. The fair value amounts for all Long-term debt were classified in Level 2 of the fair value hierarchy.
 June 30, 2021December 31, 2020
 Carrying
value
Fair
value
Carrying
value
Fair
value
Long-term debt, less amount due within one year$4,227 $4,886 $4,699 $5,426 
Restricted cash, which was included in Prepaid expenses and other current assets in the Consolidated Balance Sheet, was $1 at both June 30, 2021 and December 31, 2020.