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v3.23.3

Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Schedule of Company's Pension and Postretirement Benefit Plans |
Components of net cost (benefit) for pension and other postretirement plans |  |  |  |
|  | Three months ended September 30, |  | Nine months ended September 30,
($ in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Pension benefits |  |  |  |  |  |  |  |
Service cost |  | $ | 34 |  |  | $ | 22 |  |  | $ | 99 |  |  | $ | 79 |
Interest cost |  | 58 |  |  | 59 |  |  | 176 |  |  | 157 |
Expected return on plan assets |  | (78) |  |  | (85) |  |  | (234) |  |  | (295) |
Amortization of prior service credit |  | — |  |  | (2) |  |  | — |  |  | (27) |
Costs and expenses |  | 14 |  |  | (6) |  |  | 41 |  |  | (86) |
Remeasurement of projected benefit obligation |  | (211) |  |  | (254) |  |  | (156) |  |  | (1,427) |
Remeasurement of plan assets |  | 369 |  |  | 335 |  |  | 219 |  |  | 1,563 |
Remeasurement (gains) losses |  | 158 |  |  | 81 |  |  | 63 |  |  | 136 |
Pension net cost |  | $ | 172 |  |  | $ | 75 |  |  | $ | 104 |  |  | $ | 50 |
Postretirement benefits |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Interest cost |  | 3 |  |  | 3 |  |  | 8 |  |  | 7 |
Amortization of prior service credit |  | (6) |  |  | (7) |  |  | (18) |  |  | (19) |
Costs and expenses |  | (3) |  |  | (4) |  |  | (10) |  |  | (11) |
Remeasurement of projected benefit obligation |  | (9) |  |  | (2) |  |  | (7) |  |  | (45) |
Remeasurement of plan assets |  | — |  |  | — |  |  | — |  |  | — |
Remeasurement (gains) losses |  | (9) |  |  | (2) |  |  | (7) |  |  | (45) |
Postretirement net benefit |  | $ | (12) |  |  | $ | (6) |  |  | $ | (17) |  |  | $ | (56) |
Pension and postretirement benefits |  |  |  |  |  |  |  |
Costs and expenses |  | $ | 11 |  |  | $ | (10) |  |  | $ | 31 |  |  | $ | (97) |
Remeasurement (gains) losses |  | 149 |  |  | 79 |  |  | 56 |  |  | 91 |
Total net cost (benefit) |  | $ | 160 |  |  | $ | 69 |  |  | $ | 87 |  |  | $ | (6) |
Pension and postretirement benefits remeasurement gains and losses |  |  |  |
|  | Three months ended September 30, |  | Nine months ended September 30,
($ in millions) |  | 2023 |  | 2022 |  | 2023 |  | 2022
Remeasurement of projected benefit obligation (gains) losses: |  |  |  |  |  |  |  |
Discount rate |  | $ | (231) |  |  | $ | (284) |  |  | $ | (180) |  |  | $ | (1,289) |
Other assumptions |  | 11 |  |  | 28 |  |  | 17 |  |  | (183) |
Remeasurement of plan assets (gains) losses |  | 369 |  |  | 335 |  |  | 219 |  |  | 1,563 |
Remeasurement (gains) losses |  | $ | 149 |  |  | $ | 79 |  |  | $ | 56 |  |  | $ | 91 |

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