Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

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 Consolidated Balance Sheet:

	December 31, 2023
(dollars in millions)	Total		Level 1		Level 2		Level 3
Recurring fair value measurements:
Marketable securities held in trusts	$	745	$	682	$	63	$	—
Derivative assets	308		—		308		—
Derivative liabilities	180		—		180		—

	December 31, 2022
(dollars in millions)	Total		Level 1		Level 2		Level 3
Recurring fair value measurements:
Marketable securities held in trusts	$	774	$	713	$	61	$	—
Derivative assets	84		—		84		—
Derivative liabilities	386		—		386		—

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 Consolidated Balance Sheet at December 31:

	2023				2022
(dollars in millions)	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Customer financing notes receivables	$	74	$	63	$	169	$	161
Long-term debt (excluding finance leases)	43,546		41,598		31,201		28,049

The following tables provide the valuation hierarchy classification of assets and liabilities that are not carried at fair value in our Consolidated Balance Sheet at December 31:

	2023
(dollars in millions)	Total		Level 1		Level 2		Level 3
Customer financing notes receivable	$	63	$	—	$	63	$	—
Long-term debt (excluding finance leases)	41,598		—		37,559		4,039

	2022
(dollars in millions)	Total		Level 1		Level 2		Level 3
Customer financing notes receivable	$	161	$	—	$	161	$	—
Long-term debt (excluding finance leases)	28,049		—		28,003		46