Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

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)	Total		Level 1		Level 2		Level 3
Recurring fair value measurements:
Marketable securities held in trusts	$	965	$	890	$	75	$	—
Derivative assets	70		—		70		—
Derivative liabilities	(213)		—		(213)		—

	December 31, 2020
(dollars in millions)	Total		Level 1		Level 2		Level 3
Recurring fair value measurements:
Marketable securities held in trusts	$	881	$	773	$	108	$	—
Derivative assets	241		—		241		—
Derivative liabilities	(98)		—		(98)		—

Fair Value, by Balance Sheet Grouping [Table Text Block]

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:

	2021				2020
(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)	Total		Level 1		Level 2		Level 3
Customer financing notes receivables	$	192	$	—	$	192	$	—
Long-term debt (excluding finance leases)	(35,828)		—		(35,778)		(50)

	December 31, 2020
(dollars in millions)	Total		Level 1		Level 2		Level 3
Customer financing notes receivables	$	264	$	—	$	264	$	—
Long-term debt (excluding finance leases)	(38,615)		—		(38,540)		(75)