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Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2026
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic (benefit) cost for defined benefit pension plans are summarized in the following table:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(Dollars in millions) | Income Statement Location | 2026 |  | 2025 |  | 2026 |  | 2025
Service cost | Personnel expense | $ | 75 |  |  | $ | 69 |  |  | $ | 150 |  |  | $ | 137 |
Interest cost | Other expense | 122 |  |  | 114 |  |  | 244 |  |  | 228 |
Estimated return on plan assets | Other expense | (267) |  |  | (242) |  |  | (534) |  |  | (485) |
Net periodic (benefit) cost |  | $ | (70) |  |  | $ | (59) |  |  | $ | (140) |  |  | $ | (120) |

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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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