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Fair Value Measurements
12 Months Ended
Dec. 31, 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 Consolidated Balance Sheet as of December 31, 2021 and 2020:
December 31, 2021
 (dollars in millions)
TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$965 $890 $75 $ 
Derivative assets70  70  
Derivative liabilities(213) (213) 
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 December 31, 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 Consolidated Balance Sheet at December 31:
 20212020
(dollars in millions)Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Customer financing notes receivables$195 $192 $271 $264 
Long-term debt (excluding finance leases)(31,250)(35,828)(31,512)(38,615)
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, 2021 and 2020:
December 31, 2021
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivables$192 $ $192 $ 
Long-term debt (excluding finance leases)(35,828) (35,778)(50)
December 31, 2020
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivables$264 $— $264 $— 
Long-term debt (excluding finance leases)(38,615)— (38,540)(75)
The fair value of our Short-term borrowings approximates the carrying value due to their short-term nature, with commercial paper classified as level 2 and other short-term borrowings classified as level 3 within the fair value hierarchy.