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Pension and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Components Of Net Periodic Benefit Costs | Net periodic pension cost included the following components:
|  | Three Months Ended June 30 |  |
|  | Qualified Plans |  | Non-qualified Plans |  |  |  | Total
|  | 2024 |  | 2023 |  |  |  | 2024 |  | 2023 |  |  |  | 2024 |  | 2023 |  |
| (In millions)
Service cost | $ | 4 |  |  | $ | 6 |  |  |  |  | $ | 1 |  |  | $ | — |  |  |  |  | $ | 5 |  |  | $ | 6 |  |  |
Interest cost | 21 |  |  | 21 |  |  |  | 1 |  | 1 |  |  |  |  | 22 |  | 22 |  |
Expected return on plan assets | (31) |  |  | (30) |  |  |  | — |  | — |  |  |  |  | (31) |  |  | (30) |  |
Amortization of actuarial loss | 6 |  |  | 6 |  |  |  | — |  | — |  |  |  |  | 6 |  |  | 6 |  |
Net periodic pension cost | $ | — |  |  | $ | 3 |  |  |  |  | $ | 2 |  |  | $ | 1 |  |  |  |  | $ | 2 |  |  | $ | 4 |  |  |
|  | Six Months Ended June 30 |  |
|  | Qualified Plans |  | Non-qualified Plans |  |  |  | Total
|  | 2024 |  | 2023 |  |  |  | 2024 |  | 2023 |  |  |  | 2024 |  | 2023 |  |
| (In millions)
Service cost | $ | 10 |  |  | $ | 11 |  |  |  |  | $ | 1 |  |  | $ | 1 |  |  |  |  | $ | 11 |  |  | $ | 12 |  |  |
Interest cost | 41 |  | 42 |  |  |  | 2 |  |  | 3 |  |  |  |  | 43 |  |  | 45 |  |  |
Expected return on plan assets | (62) |  | (60) |  |  |  | — |  |  | — |  |  |  |  | (62) |  |  | (60) |  |  |
Amortization of actuarial loss | 11 |  | 12 |  |  |  | 1 |  |  | 1 |  |  |  |  | 12 |  |  | 13 |  |  |
Net periodic pension cost | $ | — |  |  | $ | 5 |  |  |  |  | $ | 4 |  |  | $ | 5 |  |  |  |  | $ | 4 |  |  | $ | 10 |  |  |

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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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