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Fair Value of Financial Instruments
3 Months Ended
Mar. 31, 2024
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 Long-term debt due within one year 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 and are carried at fair value based on quoted market prices. The aforementioned securities are classified in Level 1 of the fair value hierarchy and are included in Other noncurrent assets in the Consolidated Balance Sheet. 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.
 March 31, 2024December 31, 2023
 Carrying
value
Fair
value
Carrying
value
Fair
value
Long-term debt$3,486 $3,470 $3,500 $3,504 
Restricted cash, which is included in Prepaid expenses and other current assets in the Consolidated Balance Sheet, was $1 and less than $1 as of March 31, 2024 and December 31, 2023, respectively.