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Pension Plans, Retirement Benefits and Savings Plans (Table) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Summary of the components of net periodic benefit cost (benefit) for the Company's pension and postretirement benefit plans recognized in the consolidated statement of income [Table Text Block] | The following table summarizes the components of net periodic benefit cost (benefit) for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income for the three months ended September 30, 2025 and 2024.
|  | Pension Plans |  | Postretirement Benefit Plans
(for the three months ended September 30, in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Net Periodic Benefit Cost (Benefit): |  |  |  |  |  |  |  |
Service cost |  | $ | 28 |  |  | $ | 29 |  |  | $ | — |  |  | $ | — |
Non-service cost (benefit): |  |  |  |  |  |  |  |
Interest cost on benefit obligation |  | 44 |  |  | 43 |  |  | 1 |  |  | 1 |
Expected return on plan assets |  | (71) |  |  | (74) |  |  | — |  |  | — |
Amortization of unrecognized: |  |  |  |  |  |  |  |
Prior service benefit |  | — |  |  | — |  |  | — |  |  | — |
Net actuarial (gain) loss |  | 4 |  |  | 2 |  |  | (3) |  |  | (3) |
Total non-service cost (benefit) |  | (23) |  |  | (29) |  |  | (2) |  |  | (2) |
Net periodic benefit cost (benefit) |  | $ | 5 |  |  | $ | — |  |  | $ | (2) |  |  | $ | (2) |
The following table indicates the line items in which the respective service cost and non-service cost (benefit) are presented in the consolidated statement of income for the three months ended September 30, 2025 and 2024.
|  | Pension Plans |  | Postretirement Benefit Plans
(for the three months ended September 30, in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service Cost: |  |  |  |  |  |  |  |
Claims and claim adjustment expenses |  | $ | 11 |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |
General and administrative expenses |  | 17 |  |  | 18 |  |  | — |  |  | — |
Total service cost |  | 28 |  |  | 29 |  |  | — |  |  | — |
Non-Service Cost (Benefit): |  |  |  |  |  |  |  |
Claims and claim adjustment expenses |  | (9) |  |  | (11) |  |  | (1) |  |  | — |
General and administrative expenses |  | (14) |  |  | (18) |  |  | (1) |  |  | (2) |
Total non-service cost (benefit) |  | (23) |  |  | (29) |  |  | (2) |  |  | (2) |
Net periodic benefit cost (benefit) |  | $ | 5 |  |  | $ | — |  |  | $ | (2) |  |  | $ | (2) |
The following table summarizes the components of net periodic benefit cost (benefit) for the Company’s pension and postretirement benefit plans recognized in the consolidated statement of income for the nine months ended September 30, 2025 and 2024.
|  | Pension Plans |  | Postretirement Benefit Plans
(for the nine months ended September 30, in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Net Periodic Benefit Cost (Benefit): |  |  |  |  |  |  |  |
Service cost |  | $ | 85 |  |  | $ | 87 |  |  | $ | — |  |  | $ | — |
Non-service cost (benefit): |  |  |  |  |  |  |  |
Interest cost on benefit obligation |  | 132 |  |  | 129 |  |  | 2 |  |  | 3 |
Expected return on plan assets |  | (211) |  |  | (223) |  |  | — |  |  | — |
Amortization of unrecognized: |  |  |  |  |  |  |  |
Prior service benefit |  | — |  |  | — |  |  | (1) |  |  | (2) |
Net actuarial (gain) loss |  | 11 |  |  | 5 |  |  | (9) |  |  | (7) |
Total non-service cost (benefit) |  | (68) |  |  | (89) |  |  | (8) |  |  | (6) |
Net periodic benefit cost (benefit) |  | $ | 17 |  |  | $ | (2) |  |  | $ | (8) |  |  | $ | (6) |
The following table indicates the line items in which the respective service cost and non-service cost (benefit) are presented in the consolidated statement of income for the nine months ended September 30, 2025 and 2024.
|  | Pension Plans |  | Postretirement Benefit Plans
(for the nine months ended September 30, in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service Cost: |  |  |  |  |  |  |  |
Claims and claim adjustment expenses |  | $ | 33 |  |  | $ | 34 |  |  | $ | — |  |  | $ | — |
General and administrative expenses |  | 52 |  |  | 53 |  |  | — |  |  | — |
Total service cost |  | 85 |  |  | 87 |  |  | — |  |  | — |
Non-Service Cost (Benefit): |  |  |  |  |  |  |  |
Claims and claim adjustment expenses |  | (26) |  |  | (34) |  |  | (3) |  |  | (2) |
General and administrative expenses |  | (42) |  |  | (55) |  |  | (5) |  |  | (4) |
Total non-service cost (benefit) |  | (68) |  |  | (89) |  |  | (8) |  |  | (6) |
Net periodic benefit cost (benefit) |  | $ | 17 |  |  | $ | (2) |  |  | $ | (8) |  |  | $ | (6) |

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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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