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Investment And Other Income (loss), Net (Tables) | 9 Months Ended
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Sep. 30, 2025
Investment And Other Income (loss), Net [Abstract] |
Components Of Investment And Other Income |
|  |  | For the three months ended ‎September 30, |  | For the nine months ended ‎September 30, |
| ($ in millions) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Interest and dividend income |  | $ | 4 |  | $ | 20 |  | $ | 20 |  | $ | 58 |
| Pension benefit |  |  | 7 |  |  | 9 |  |  | 19 |  |  | 30 |
| OPEB costs |  |  | (1) |  |  | (1) |  |  | (3) |  |  | (3) |
| OPEB remeasurement gain (loss) |  |  | - |  |  | (21) |  |  | (8) |  |  | 6 |
| Pension remeasurement gain |  |  | - |  |  | 23 |  |  | 44 |  |  | 25 |
| Pension building sale (loss) |  |  | (19) |  |  | - |  |  | (19) |  |  | - |
| All other, net |  |  | - |  |  | (1) |  |  | 1 |  |  | 1 |
| Total investment and other income (loss), net |  | $ | (9) |  | $ | 29 |  | $ | 54 |  | $ | 117 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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