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v3.25.3

Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of Components of Net Cost (Benefit) for Pension and Other Postretirement Plans |
Components of net cost (benefit) for pension and other postretirement plans |  |  |  |
|  | Three months ended September 30, |  | Nine months ended September 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Pension benefits |  |  |  |  |  |  |  |
Service cost (1) |  | $ | 28 |  |  | $ | 26 |  |  | $ | 79 |  |  | $ | 52 |
Interest cost |  | 58 |  |  | 59 |  |  | 177 |  |  | 175 |
Expected return on plan assets |  | (77) |  |  | (74) |  |  | (233) |  |  | (227) |
Costs and expenses |  | 9 |  |  | 11 |  |  | 23 |  |  | — |
Remeasurement of projected benefit obligation |  | 20 |  |  | 233 |  |  | 128 |  |  | 140 |
Remeasurement of plan assets |  | (127) |  |  | (214) |  |  | (158) |  |  | (129) |
Remeasurement (gains) losses |  | (107) |  |  | 19 |  |  | (30) |  |  | 11 |
Pension net (benefit) cost |  | $ | (98) |  |  | $ | 30 |  |  | $ | (7) |  |  | $ | 11 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  | 2 |  |  | 2 |  |  | 6 |  |  | 7 |
Amortization of prior service credit |  | (1) |  |  | — |  |  | (1) |  |  | (1) |
Costs and expenses |  | 1 |  |  | 2 |  |  | 5 |  |  | 6 |
Remeasurement of benefit obligation |  | (1) |  |  | 7 |  |  | — |  |  | 4 |
Remeasurement of plan assets |  | — |  |  | — |  |  | — |  |  | — |
Remeasurement (gains) losses |  | (1) |  |  | 7 |  |  | — |  |  | 4 |
Postretirement net cost |  | $ | — |  |  | $ | 9 |  |  | $ | 5 |  |  | $ | 10 |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | 10 |  |  | $ | 13 |  |  | $ | 28 |  |  | $ | 6 |
Remeasurement (gains) losses |  | (108) |  |  | 26 |  |  | (30) |  |  | 15 |
Total net (benefit) cost |  | $ | (98) |  |  | $ | 39 |  |  | $ | (2) |  |  | $ | 21 |
(1) For the first nine months of 2024, service cost includes a $38 million refund of premiums previously paid to the Pension Benefit Guaranty Corporation.
Schedule of Pension and Postretirement Benefits Remeasurement Gains and Losses |
Pension and postretirement benefits remeasurement gains and losses |  |  |  |
|  | Three months ended September 30, |  | Nine months ended September 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Remeasurement of benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | 29 |  |  | $ | 213 |  |  | $ | 93 |  |  | $ | 115 |
Other assumptions |  | (10) |  |  | 27 |  |  | 35 |  |  | 29 |
Remeasurement of plan assets (gains) losses |  | (127) |  |  | (214) |  |  | (158) |  |  | (129) |
Remeasurement (gains) losses |  | $ | (108) |  |  | $ | 26 |  |  | $ | (30) |  |  | $ | 15 |

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