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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2024
Retirement Benefits [Abstract] |
Benefit or (Income) Cost Related to Pension and Postretirement Health Care and Life Insurance | The following table summarizes the components of net periodic benefit cost (income) related to our pension and postretirement health care and life insurance plans:
| (dollars in millions)
| Pension |  | Health Care and Life
Three Months Ended June 30, | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost - Cost of services | $ | 39 |  |  | $ | 45 |  |  | $ | 11 |  |  | $ | 12 |
Service cost - Selling, general and administrative expense | 6 |  |  | 7 |  |  | 2 |  |  | 2 |
Service cost | $ | 45 |  |  | $ | 52 |  |  | $ | 13 |  |  | $ | 14 |
Amortization of prior service cost (credit) | $ | 28 |  |  | $ | 28 |  |  | $ | (32) |  |  | $ | (104) |
Expected return on plan assets | (140) |  |  | (253) |  |  | (7) |  |  | (8) |
Interest cost | 112 |  |  | 188 |  |  | 136 |  |  | 136 |
Remeasurement loss, net | 136 |  |  | — |  |  | — |  |  | — |
Other components | $ | 136 |  |  | $ | (37) |  |  | $ | 97 |  |  | $ | 24 |
Total | $ | 181 |  |  | $ | 15 |  |  | $ | 110 |  |  | $ | 38 |
| (dollars in millions)
| Pension |  | Health Care and Life
Six Months Ended June 30, | 2024 |  | 2023 |  | 2024 |  | 2023
Service cost - Cost of services | $ | 80 |  |  | $ | 91 |  |  | $ | 22 |  |  | $ | 23 |
Service cost - Selling, general and administrative expense | 13 |  |  | 14 |  |  | 4 |  |  | 4 |
Service cost | $ | 93 |  |  | $ | 105 |  |  | $ | 26 |  |  | $ | 27 |
Amortization of prior service cost (credit) | $ | 56 |  |  | $ | 56 |  |  | $ | (64) |  |  | $ | (209) |
Expected return on plan assets | (348) |  |  | (506) |  |  | (14) |  |  | (15) |
Interest cost | 269 |  |  | 376 |  |  | 271 |  |  | 272 |
Remeasurement loss, net | 63 |  |  | — |  |  | — |  |  | — |
Other components | $ | 40 |  |  | $ | (74) |  |  | $ | 193 |  |  | $ | 48 |
Total | $ | 133 |  |  | $ | 31 |  |  | $ | 219 |  |  | $ | 75 |

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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://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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