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Fair Value Measurements
9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Disclosures [Text Block] Fair Value Measurements
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 Condensed Consolidated Balance Sheet as of September 30, 2021 and December 31, 2020:
September 30, 2021
(dollars in millions)TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$965 $890 $75 $ 
Derivative assets103  103  
Derivative liabilities(133) (133) 
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)— 
Valuation Techniques. 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 September 30, 2021, 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 Condensed Consolidated Balance Sheet at September 30, 2021 and December 31, 2020:
 September 30, 2021December 31, 2020
(dollars in millions)Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Customer financing notes receivable$299 $326 $271 $264 
Short-term borrowings(206)(206)(247)(247)
Long-term debt (excluding finance leases)(30,942)(36,200)(31,512)(38,615)
Long-term liabilities(35)(33)(27)(25)
The following table provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet at September 30, 2021 and December 31, 2020:
September 30, 2021
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$326 $ $326 $ 
Short-term borrowings(206) (160)(46)
Long-term debt (excluding finance leases)(36,200) (36,147)(53)
Long-term liabilities(33) (33) 
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)—