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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
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, 2022
(dollars in millions)TotalLevel 1Level 2Level 3
Recurring fair value measurements:
Marketable securities held in trusts$788 $725 $63 $— 
Derivative assets58 — 58 — 
Derivative liabilities367 — 367 — 
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 liabilities213 — 213 — 
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, 2022December 31, 2021
(dollars in millions)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
Customer financing notes receivable$198 $187 $195 $192 
Long-term debt (excluding finance leases)31,204 29,505 31,250 35,828 
The following tables provides the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Condensed Consolidated Balance Sheet:
June 30, 2022
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$187 $— $187 $— 
Long-term debt (excluding finance leases)29,505 — 29,457 48 
December 31, 2021
(dollars in millions)TotalLevel 1Level 2Level 3
Customer financing notes receivable$192 $— $192 $— 
Long-term debt (excluding finance leases)35,828 — 35,778 50