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v3.25.2

Benefit Plans (Tables) | 6 Months Ended
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Jun. 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 June 30, |  | Six months ended June 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Pension benefits |  |  |  |  |  |  |  |
Service cost (1) |  | $ | 26 |  |  | $ | (7) |  |  | $ | 51 |  |  | $ | 26 |
Interest cost |  | 59 |  |  | 58 |  |  | 119 |  |  | 116 |
Expected return on plan assets |  | (78) |  |  | (76) |  |  | (156) |  |  | (153) |
Costs and expenses |  | 7 |  |  | (25) |  |  | 14 |  |  | (11) |
Remeasurement of projected benefit obligation |  | 55 |  |  | (68) |  |  | 108 |  |  | (93) |
Remeasurement of plan assets |  | (54) |  |  | 60 |  |  | (31) |  |  | 85 |
Remeasurement (gains) losses |  | 1 |  |  | (8) |  |  | 77 |  |  | (8) |
Pension net cost (benefit) |  | $ | 8 |  |  | $ | (33) |  |  | $ | 91 |  |  | $ | (19) |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  | 2 |  |  | 3 |  |  | 4 |  |  | 5 |
Amortization of prior service credit |  | — |  |  | (1) |  |  | — |  |  | (1) |
Costs and expenses |  | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Remeasurement of benefit obligation |  | (1) |  |  | (1) |  |  | 1 |  |  | (3) |
Remeasurement of plan assets |  | — |  |  | — |  |  | — |  |  | — |
Remeasurement (gains) losses |  | (1) |  |  | (1) |  |  | 1 |  |  | (3) |
Postretirement net cost |  | $ | 1 |  |  | $ | 1 |  |  | $ | 5 |  |  | $ | 1 |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | 9 |  |  | $ | (23) |  |  | $ | 18 |  |  | $ | (7) |
Remeasurement (gains) losses |  | — |  |  | (9) |  |  | 78 |  |  | (11) |
Total net cost (benefit) |  | $ | 9 |  |  | $ | (32) |  |  | $ | 96 |  |  | $ | (18) |
(1) For the second quarter and first six months of 2024, service cost includes a $38 million refund of premiums previously paid to the Pension Benefit Guaranty Corporation.
Schedule of Pension and Postretirement Benefits Remeasurement Gains and Losses |
Pension and postretirement benefits remeasurement gains and losses |  |  |  |
|  | Three months ended June 30, |  | Six months ended June 30,
($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Remeasurement of benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | 5 |  |  | $ | (57) |  |  | $ | 64 |  |  | $ | (98) |
Other assumptions |  | 49 |  |  | (12) |  |  | 45 |  |  | 2 |
Remeasurement of plan assets (gains) losses |  | (54) |  |  | 60 |  |  | (31) |  |  | 85 |
Remeasurement (gains) losses |  | $ | — |  |  | $ | (9) |  |  | $ | 78 |  |  | $ | (11) |

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