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Fair Value Measurements
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block] FAIR VALUE MEASUREMENTS
In accordance with the provisions of ASC 820, the following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring basis in our Consolidated Balance Sheet as of December 31, 2020 and 2019:
December 31, 2020
 (dollars in millions)
TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$881 $773 $108 $ 
Derivative assets241  241  
Derivative liabilities(98) (98) 
December 31, 2019
 (dollars in millions)
TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Available-for-sale securities$53 $53 $— $— 
Derivative assets46 — 46 — 
Derivative liabilities(282)— (282)— 
Valuation Techniques. Our available-for-sale securities include equity investments that are traded in active markets, either domestically or internationally, and are measured at fair value using closing stock prices from active markets. Our derivative assets and liabilities include foreign exchange contracts that are measured at fair value using internal models based on observable market inputs such as forward rates, interest rates, our own credit risk and our counterparties’ credit risks.
As of December 31, 2020, there has not been any significant impact to the fair value of our derivative liabilities due to our own credit risk. Similarly, there has not been any significant adverse impact to our derivative assets based on our evaluation of our counterparties’ credit risks.
The following table provides carrying amounts and fair values of financial instruments that are not carried at fair value in our Consolidated Balance Sheet at December 31:
 20202019
(dollars in millions)Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Customer financing notes receivable$271 $264 $220 $220 
Short-term borrowings(247)(247)(2,293)(2,293)
Long-term debt (excluding finance leases)(31,512)(38,615)(40,883)(45,887)
Long-term liabilities(27)(25)(334)(320)
The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Consolidated Balance Sheet as of December 31, 2020 and 2019:
December 31, 2020
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$264 $ $264 $ 
Short-term borrowings(247) (160)(87)
Long-term debt (excluding finance leases)(38,615) (38,540)(75)
Long-term liabilities(25) (25) 

December 31, 2019
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$220 $— $220 $— 
Short-term borrowings(2,293)— — (2,293)
Long-term debt (excluding finance leases)(45,887)— (45,802)(85)
Long-term liabilities(320)— (320)—