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Fair Value of Financial Instruments
12 Months Ended
Dec. 31, 2020
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, 2020December 31, 2019
$ in millionsLevel 1Level 2TotalLevel 1Level 2Total
Financial Assets (Liabilities)
Marketable securities$377 $1 $378 $364 $$365 
Marketable securities valued using NAV18 17 
Total marketable securities377 1 396 364 382 
Derivatives   — (3)(3)
The notional value of the company’s foreign currency forward contracts at December 31, 2020 and 2019 was $133 million and $98 million, respectively. At December 31, 2020, no portion of the notional value was designated as a cash flow hedge. The portion of notional value designated as a cash flow hedge at December 31, 2019 was $7 million.
The derivative fair values and related unrealized gains/losses at December 31, 2020 and 2019 were not material.
There were no transfers of financial instruments between the three levels of the fair value hierarchy during the years ended December 31, 2020 and 2019.
The carrying value of cash and cash equivalents and commercial paper approximates fair value.