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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2024
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) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 26 |  |  | $ | 34 |  |  | $ | 52 |  |  | $ | 99 |
Interest cost |  | 59 |  |  | 58 |  |  | 175 |  |  | 176 |
Expected return on plan assets |  | (74) |  |  | (78) |  |  | (227) |  |  | (234) |
Costs and expenses |  | 11 |  |  | 14 |  |  | — |  |  | 41 |
Remeasurement of projected benefit obligation |  | 233 |  |  | (211) |  |  | 140 |  |  | (156) |
Remeasurement of plan assets |  | (214) |  |  | 369 |  |  | (129) |  |  | 219 |
Remeasurement (gains) losses |  | 19 |  |  | 158 |  |  | 11 |  |  | 63 |
Pension net cost |  | $ | 30 |  |  | $ | 172 |  |  | $ | 11 |  |  | $ | 104 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  | 2 |  |  | 3 |  |  | 7 |  |  | 8 |
Amortization of prior service credit |  | — |  |  | (6) |  |  | (1) |  |  | (18) |
Costs and expenses |  | 2 |  |  | (3) |  |  | 6 |  |  | (10) |
Remeasurement of benefit obligation |  | 7 |  |  | (9) |  |  | 4 |  |  | (7) |
Remeasurement of plan assets |  | — |  |  | — |  |  | — |  |  | — |
Remeasurement (gains) losses |  | 7 |  |  | (9) |  |  | 4 |  |  | (7) |
Postretirement net cost (benefit) |  | $ | 9 |  |  | $ | (12) |  |  | $ | 10 |  |  | $ | (17) |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | 13 |  |  | $ | 11 |  |  | $ | 6 |  |  | $ | 31 |
Remeasurement (gains) losses |  | 26 |  |  | 149 |  |  | 15 |  |  | 56 |
Total net cost |  | $ | 39 |  |  | $ | 160 |  |  | $ | 21 |  |  | $ | 87 |
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) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Remeasurement of benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | 213 |  |  | $ | (231) |  |  | $ | 115 |  |  | $ | (180) |
Other assumptions |  | 27 |  |  | 11 |  |  | 29 |  |  | 17 |
Remeasurement of plan assets (gains) losses |  | (214) |  |  | 369 |  |  | (129) |  |  | 219 |
Remeasurement (gains) losses |  | $ | 26 |  |  | $ | 149 |  |  | $ | 15 |  |  | $ | 56 |

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