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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis

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:

			September 30, 2025
(dollars in millions)			Total						Level 1						Level 2						Level 3
Recurring fair value measurements:
Marketable securities held in trusts			$	713					$	641					$	72					$	—
Derivative assets			362						—						362						—
Derivative liabilities			342						—						342						—

			December 31, 2024
(dollars in millions)			Total						Level 1						Level 2						Level 3
Recurring fair value measurements:
Marketable securities held in trusts			$	786					$	721					$	65					$	—
Derivative assets			187						—						187						—
Derivative liabilities			451						—						451						—

Schedule of Assets and Liabilities Not Carried at Fair Value

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:

			September 30, 2025												December 31, 2024
(dollars in millions)			Carrying Amount						Fair Value						Carrying Amount						Fair Value
Long-term debt (excluding finance leases)			$	38,766					$	36,854					$	40,991					$	37,956

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:

			September 30, 2025
(dollars in millions)			Total						Level 1						Level 2						Level 3
Long-term debt (excluding finance leases)			$	36,854					$	—					$	34,823					$	2,031

			December 31, 2024
(dollars in millions)			Total						Level 1						Level 2						Level 3
Long-term debt (excluding finance leases)			$	37,956					$	—					$	35,180					$	2,776

X

- Definition

Tabular disclosure of financial instrument measured at fair value on recurring or nonrecurring basis. Includes, but is not limited to, instrument classified in shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-3

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- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-12

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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