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Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |  |
($ in millions) |  | 2024 |  | 2023 |  |  |  |
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 33 |  |  | $ | 33 |  |  |  |  |
Interest cost |  | 58 |  |  | 60 |  |  |  |  |
Expected return on plan assets |  | (77) |  |  | (77) |  |  |  |  |
Amortization of prior service credit |  | — |  |  | — |  |  |  |  |
Costs and expenses |  | 14 |  |  | 16 |  |  |  |  |
Remeasurement of projected benefit obligation |  | (25) |  |  | 123 |  |  |  |  |
Remeasurement of plan assets |  | 25 |  |  | (180) |  |  |  |  |
Remeasurement (gains) losses |  | — |  |  | (57) |  |  |  |  |
Pension net cost (benefit) |  | $ | 14 |  |  | $ | (41) |  |  |  |  |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  |  |  |
Interest cost |  | 2 |  |  | 3 |  |  |  |  |
Amortization of prior service credit |  | — |  |  | (6) |  |  |  |  |
Costs and expenses |  | 2 |  |  | (3) |  |  |  |  |
Remeasurement of projected benefit obligation |  | (2) |  |  | 4 |  |  |  |  |
Remeasurement of plan assets |  | — |  |  | — |  |  |  |  |
Remeasurement (gains) losses |  | (2) |  |  | 4 |  |  |  |  |
Postretirement net cost |  | $ | — |  |  | $ | 1 |  |  |  |  |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | 16 |  |  | $ | 13 |  |  |  |  |
Remeasurement (gains) losses |  | (2) |  |  | (53) |  |  |  |  |
Total net cost (benefit) |  | $ | 14 |  |  | $ | (40) |  |  |  |  |
Schedule of Pension and Postretirement Benefits Remeasurement Gains and Losses |
Pension and postretirement benefits remeasurement gains and losses |  |  |  |
|  | Three months ended March 31, |  |
($ in millions) |  | 2024 |  | 2023 |  |  |  |
Remeasurement of projected benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | (41) |  |  | $ | 124 |  |  |  |  |
Other assumptions |  | 14 |  |  | 3 |  |  |  |  |
Remeasurement of plan assets (gains) losses |  | 25 |  |  | (180) |  |  |  |  |
Remeasurement (gains) losses |  | $ | (2) |  |  | $ | (53) |  |  |  |  |

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