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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Contributions to Plans | Contributions to our plans were as follows:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(dollars in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
U.S. qualified defined benefit plans | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
International defined benefit plans | 1 |  |  | 6 |  |  | 15 |  |  | 18 |
PRB plans | 7 |  |  | 6 |  |  | 18 |  |  | 19 |
Defined contribution plans | 316 |  |  | 308 |  |  | 1,057 |  |  | 1,042 |
Schedule of Amounts Recognized in the Balance Sheet | The amounts recognized in the Condensed Consolidated Balance Sheet consist of:
(dollars in millions) | September 30, 2025 |  | December 31, 2024
Non-current pension assets (included in Other assets) | $ | 2,659 |  |  | $ | 1,819 |
Current pension and PRB liabilities (included in Accrued employee compensation) | 257 |  |  | 256 |
Future pension and postretirement benefit obligations | 1,981 |  |  | 2,104 |
The amounts recognized in Future pension and postretirement benefit obligations consist of:
(dollars in millions) | September 30, 2025 |  | December 31, 2024
Non-current pension liabilities | $ | 1,434 |  |  | $ | 1,532 |
Non-current PRB liabilities | 480 |  |  | 523 |
Other pension and PRB related items | 67 |  |  | 49 |
Future pension and postretirement benefit obligations | $ | 1,981 |  |  | $ | 2,104 |
Schedule of Net Periodic Costs (Income) | The components of net periodic income for our defined pension plans were as follows:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(dollars in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Operating expense |  |  |  |  |  |  |
Service cost | $ | 42 |  |  | $ | 47 |  |  | $ | 126 |  |  | $ | 141 |
Non-operating expense |  |  |  |  |  |  |
Interest cost | 587 |  |  | 597 |  |  | 1,756 |  |  | 1,789 |
Expected return on plan assets | (922) |  |  | (937) |  |  | (2,760) |  |  | (2,810) |
Amortization of prior service credit | (32) |  |  | (42) |  |  | (107) |  |  | (127) |
Recognized actuarial net loss | 5 |  |  | 5 |  |  | 15 |  |  | 15 |
Net settlement, curtailment, and special termination benefit loss | — |  |  | 4 |  |  | 14 |  |  | — |
Non-service pension income | (362) |  |  | (373) |  |  | (1,082) |  |  | (1,133) |
Total net periodic pension income | $ | (320) |  |  | $ | (326) |  |  | $ | (956) |  |  | $ | (992) |
Schedule of Marketable Securities | The fair value of marketable securities held in trusts was as follows:
(dollars in millions) | September 30, 2025 |  | December 31, 2024
Marketable securities held in trusts | $ | 713 |  |  | $ | 786 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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