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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Disclosures
9. FAIR VALUE OF FINANCIAL INSTRUMENTS
The following table presents the financial assets and liabilities the company records at fair value on a recurring basis identified by the level of inputs used to determine fair value. See Note 1 for the definitions of these levels and for further information on our financial instruments.
 December 31, 2023December 31, 2022
$ in millionsLevel 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Financial Assets
Marketable securities$321 $1 $8 $330 $310 $$$319 
Marketable securities valued using NAV9 13 
Total marketable securities321 1 8 339 310 332 
Derivatives 5  5 — — 
The notional value of the company’s foreign currency forward contracts at December 31, 2023 and 2022 was $286 million and $221 million, respectively. The portion of notional value designated as a cash flow hedge at December 31, 2023 and 2022 was $162 million and $87 million, respectively.
The derivative fair values and related unrealized gains/losses at December 31, 2023 and 2022 were not material.
There were no transfers of financial instruments into or out of Level 3 of the fair value hierarchy during the years ended December 31, 2023 and 2022.
The carrying value of cash and cash equivalents and commercial paper approximates fair value.