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Fair Value Measurements (Tables) | 6 Months Ended
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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) | Total |  | Level 1 |  | Level 2 |  | Level 3
Recurring fair value measurements: |  |  |  |  |  |  |
Marketable securities held in trusts | $ | 714 |  |  | $ | 650 |  |  | $ | 64 |  |  | $ | — |
Derivative assets | 204 |  |  | — |  |  | 204 |  |  | — |
Derivative liabilities | 192 |  |  | — |  |  | 192 |  |  | — |
| 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 |  |  | — |
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, 2024 |  | December 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) | Total |  | Level 1 |  | Level 2 |  | Level 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) | 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 |

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- 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 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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