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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Pension [Member] |
Net Periodic Benefit Cost |
|  |  |  | Pension Benefits |
|  |  | For the three months ended September 30, |  | For the nine months ended ‎September 30, |
| ($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Components of total pension benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |
| Service cost |  | $ | 11 |  | $ | 11 |  | $ | 33 |  | $ | 34 |
| Interest cost on projected benefit obligation |  |  | 31 |  |  | 31 |  |  | 95 |  |  | 94 |
| Expected return on plan assets |  |  | (38) |  |  | (40) |  |  | (114) |  |  | (124) |
| Pension remeasurement gain |  |  | - |  |  | (23) |  |  | (44) |  |  | (25) |
| Pension building sale - loss |  |  | 19 |  |  | - |  |  | 19 |  |  | - |
| Net periodic pension (benefit) costs |  |  | 23 |  |  | (21) |  |  | (11) |  |  | (21) |
| Pension special termination benefit enhancements |  |  | - |  |  | 1 |  |  | - |  |  | 11 |
| Total pension (benefit) cost |  | $ | 23 |  | $ | (20) |  | $ | (11) |  | $ | (10) |
OPEB [Member] |
Net Periodic Benefit Cost |
|  |  |  | Postretirement |
|  |  | For the three months ended September 30, |  | For the nine months ended September 30, |
| ($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Components of net periodic postretirement benefit cost |  |  |  |  |  |  |  |  |  |  |  |  |
| Service cost |  | $ | 3 |  | $ | 2 |  | $ | 5 |  | $ | 5 |
| Interest cost on projected benefit obligation |  |  | 8 |  |  | 7 |  |  | 22 |  |  | 22 |
| Amortization of prior service credit gain recognized |  |  | (7) |  |  | (6) |  |  | (19) |  |  | (19) |
| OPEB remeasurement (gain) loss |  |  | - |  |  | 21 |  |  | 8 |  |  | (6) |
| Total periodic postretirement (benefit) cost |  | $ | 4 |  | $ | 24 |  | $ | 16 |  | $ | 2 |

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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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