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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits, Description [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The components of net periodic benefit cost for the three and six months ended June 30 were as follows.
COMPONENTS OF NET PERIODIC BENEFIT COST
| Three Months Ended June 30, |  | Six Months Ended June 30,
(Dollars in millions) | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit cost |  |  |  |  |  |  |
Interest cost | $ | 8 |  |  | $ | 9 |  |  | $ | 16 |  |  | $ | 17 |
Expected return on plan assets | (8) |  |  | (8) |  |  | (16) |  |  | (16) |
Amortization of unrecognized: |  |  |  |  |  |  |
Actuarial (gain) loss | 3 |  |  | 3 |  |  | 6 |  |  | 6 |
Net periodic benefit cost | $ | 3 |  |  | $ | 4 |  |  | $ | 6 |  |  | $ | 7 |

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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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