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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost (credit) for the Corporation's qualified pension plan, non-qualified pension plan and postretirement benefit plan are as follows.
Qualified Defined Benefit Pension Plan | Three Months Ended March 31, |  |
(in millions) | 2025 |  | 2024 |  |  |  |
Service cost | $ | 9 |  |  | $ | 8 |  |  |  |  |
Other components of net benefit credit: |  |  |  |  |  |  |
Interest cost | 21 |  |  | 21 |  |  |  |  |
Expected return on plan assets | (44) |  |  | (45) |  |  |  |  |
Amortization of prior service credit | (4) |  |  | (3) |  |  |  |  |
Amortization of net loss | 6 |  |  | 6 |  |  |  |  |
Total other components of net benefit credit | (21) |  |  | (21) |  |  |  |  |
Net periodic defined benefit credit | $ | (12) |  |  | $ | (13) |  |  |  |  |
Non-Qualified Defined Benefit Pension Plan | Three Months Ended March 31, |  |
(in millions) | 2025 |  | 2024 |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  |  |  |
Other components of net benefit cost: |  |  |  |  |  |  |
Interest cost | 2 |  |  | 2 |  |  |  |  |
Amortization of prior service credit | (1) |  |  | (2) |  |  |  |  |
Amortization of net loss | 1 |  |  | 1 |  |  |  |  |
Total other components of net benefit cost | 2 |  |  | 1 |  |  |  |  |
Net periodic defined benefit cost | $ | 3 |  |  | $ | 2 |  |  |  |  |
Postretirement Benefit Plan | Three Months Ended March 31, |  |
(in millions) | 2025 |  | 2024 |  |  |  |
Other components of net benefit credit: |  |  |  |  |  |  |
Expected return on plan assets | $ | (1) |  |  | $ | (1) |  |  |  |  |
Net periodic defined benefit credit | $ | (1) |  |  | $ | (1) |  |  |  |  |

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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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