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Fair Value Measurements
9 Months Ended
Sep. 27, 2020
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table summarizes the estimated fair value of our financial instruments which are measured at fair value on a recurring basis:
Estimated fair value
Fair value
hierarchy
September 27, 2020December 31, 2019
Assets:
Money market funds12,637 
Marketable equity securities113 
Derivative instruments-assets29 10 
Liabilities:
Derivative instruments-liabilities2(7)(1)
The following methods and assumptions were used to estimate the fair value of financial instruments:

Assets and liabilities measured at fair value on a recurring basis
Investments in money market funds (as part of our cash and cash equivalents) and marketable equity securities have fair value measurements which are all based on quoted prices in active markets for identical assets or liabilities. For derivatives the fair value is based upon significant other observable inputs depending on the nature of the derivative.

Assets and liabilities recorded at fair value on a non-recurring basis
We measure and record our non-marketable equity securities, equity method investments and non-financial assets, such as intangible assets and property, plant and equipment, at fair value when an impairment charge is required.

Assets and liabilities not recorded at fair value on a recurring basis
Financial instruments not recorded at fair value on a recurring basis include non-marketable equity securities and equity method investments that have not been remeasured or impaired in the current period and debt.

As of September 27, 2020, the estimated fair value of debt, including the current portion, was $10.4 billion ($7.9 billion as of December 31, 2019). The fair value is estimated on the basis of broker-dealer quotes, which are Level 2 inputs. Accrued interest is included under accrued liabilities and not within the carrying amount or estimated fair value of debt.