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Fair Value of Financial Assets and Liabilities
3 Months Ended
Mar. 29, 2020
Fair Value Disclosures [Abstract]  
Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets and Liabilities

The following table summarizes the estimated fair value and carrying amount of our financial instruments:
 
 
 
March 29, 2020
 
December 31, 2019
 
 
Fair value
hierarchy
 
Carrying
amount

 
Estimated
fair value

 
Carrying
amount

 
Estimated
fair value

Assets:
 
 
 
 
 
 
 
 
 
Money market funds
1
 
6

 
6

 
6

 
6

Other financial assets
2
 
42

 
42

 
42

 
42

Derivative instruments-assets
2
 
8

 
8

 
10

 
10

 
 
 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
 
 
Long-term debt (bonds)
2
 
(7,366
)
 
(7,534
)
 
(7,365
)
 
(7,922
)
Derivative instruments-liabilities
2
 
(11
)
 
(11
)
 
(1
)
 
(1
)


The following methods and assumptions were used to estimate the fair value of financial instruments:

Financial assets and financial liabilities measured at fair value on a recurring basis
Investments in money market funds (as part of our cash and cash equivalents) have fair value measurements which are all based on quoted prices in active markets for identical assets or liabilities.

Other financial assets and derivatives
For other financial assets and derivatives the fair value is based upon significant other observable inputs depending on the nature of the other financial asset and derivative.

Debt
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.

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