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Employee Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The following summarizes the components of net periodic benefit for our qualified and supplemental pension plans:
(Dollars in millions) |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost |  | $ | 2 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 4 |
Non-service (benefit) costs: |  |  |  |  |  |  |  |
Interest cost |  | 3 |  |  | 4 |  |  | 10 |  |  | 10 |
Expected return on plan assets |  | (6) |  |  | (5) |  |  | (17) |  |  | (16) |
Amortization of actuarial (gain) loss and prior service cost |  | — |  |  | — |  |  | (2) |  |  | 1 |
Total non-service benefit |  | (3) |  |  | (1) |  |  | (9) |  |  | (5) |
Net periodic benefit |  | $ | (1) |  |  | $ | — |  |  | $ | (5) |  |  | $ | (1) |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -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 -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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