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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring
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:
June 30, 2024
(dollars in millions)TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$714 $650 $64 $ 
Derivative assets204  204  
Derivative liabilities192  192  
December 31, 2023
(dollars in millions)TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$745 $682 $63 $— 
Derivative assets308 — 308 — 
Derivative liabilities180 — 180 — 
Fair Value, by Balance Sheet Grouping
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:
 June 30, 2024December 31, 2023
(dollars in millions)Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Customer financing notes receivable$66 $57 $74 $63 
Long-term debt (excluding finance leases)41,828 38,542 43,546 41,598 
The following tables provide the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet:
June 30, 2024
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$57 $ $57 $ 
Long-term debt (excluding finance leases)38,542  35,250 3,292 
December 31, 2023
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$63 $— $63 $— 
Long-term debt (excluding finance leases)41,598 — 37,559 4,039