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Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance | The following tables summarize the components of net periodic benefit cost related to our pension and postretirement health care and life insurance plans:
| (dollars in millions)
| Pension |  | Health Care and Life
Three Months Ended September 30, | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost - Cost of services | $ | 34 |  |  | $ | 39 |  |  | $ | 7 |  |  | $ | 11 |
Service cost - Selling, general and administrative expense | 6 |  |  | 6 |  |  | 1 |  |  | 2 |
Service cost | $ | 40 |  |  | $ | 45 |  |  | $ | 8 |  |  | $ | 13 |
Amortization of prior service cost (credit) | $ | 28 |  |  | $ | 28 |  |  | $ | (33) |  |  | $ | (32) |
Expected return on plan assets | (133) |  |  | (134) |  |  | (7) |  |  | (7) |
Interest cost | 102 |  |  | 111 |  |  | 137 |  |  | 136 |
Remeasurement gain, net | (31) |  |  | (46) |  |  | — |  |  | — |
Other components | $ | (34) |  |  | $ | (41) |  |  | $ | 97 |  |  | $ | 97 |
Total | $ | 6 |  |  | $ | 4 |  |  | $ | 105 |  |  | $ | 110 |
| (dollars in millions)
| Pension |  | Health Care and Life
Nine Months Ended September 30, | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost - Cost of services | $ | 103 |  |  | $ | 119 |  |  | $ | 21 |  |  | $ | 33 |
Service cost - Selling, general and administrative expense | 17 |  |  | 19 |  |  | 4 |  |  | 6 |
Service cost | $ | 120 |  |  | $ | 138 |  |  | $ | 25 |  |  | $ | 39 |
Amortization of prior service cost (credit) | $ | 84 |  |  | $ | 84 |  |  | $ | (97) |  |  | $ | (96) |
Expected return on plan assets | (401) |  |  | (482) |  |  | (21) |  |  | (21) |
Interest cost | 306 |  |  | 380 |  |  | 410 |  |  | 407 |
Remeasurement loss, net | 14 |  |  | 17 |  |  | — |  |  | — |
Other components | $ | 3 |  |  | $ | (1) |  |  | $ | 292 |  |  | $ | 290 |
Total | $ | 123 |  |  | $ | 137 |  |  | $ | 317 |  |  | $ | 329 |

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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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