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Fair Value Of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value Of Financial Instruments [Abstract] |
Pension Plan Assets Measured At Fair Value On Recurring Basis |
|  |  | Fair Value Measurements at December 31, 2024 |
| ($ in millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
| Cash and Cash Equivalents |  | $ | 127 |  | $ | 127 |  | $ | - |  | $ | - |
| Government Obligations |  |  | 394 |  |  | - |  |  | 394 |  |  | - |
| Equities |  |  | 2 |  |  | 2 |  |  | - |  |  | - |
| Interest in Limited Partnerships and |  |  |  |  |  |  |  |  |  |  |  |  |
| Limited Liability Companies |  |  | 161 |  |  | - |  |  | - |  |  | 161 |
| Commingled Funds |  |  | 1,596 |  |  | - |  |  | 1,596 |  |  | - |
| Total investments at fair value |  | $ | 2,280 |  | $ | 129 |  | $ | 1,990 |  | $ | 161 |
| Interest in Registered Investment Companies (1) |  |  | - |  |  |  |  |  |  |  |  |  |
| Interest in Limited Partnerships and |  |  |  |  |  |  |  |  |  |  |  |  |
| Limited Liability Companies (1) |  |  | 65 |  |  |  |  |  |  |  |  |  |
| Interest and Dividend Receivable |  |  | 2 |  |  |  |  |  |  |  |  |  |
| Due from Broker for Securities Sold |  |  | 14 |  |  |  |  |  |  |  |  |  |
| Value of Funds Held in Insurance Co. |  |  | 4 |  |  |  |  |  |  |  |  |  |
| Due to Broker for Securities Purchased |  |  | (37) |  |  |  |  |  |  |  |  |  |
| Total Plan Assets, at Fair Value |  | $ | 2,328 |  |  |  |  |  |  |  |  |  |
|  |  | Fair Value Measurements at December 31, 2023 |
| ($ in millions) |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
| Cash and Cash Equivalents |  | $ | 128 |  | $ | 128 |  | $ | - |  | $ | - |
| Government Obligations |  |  | 300 |  |  | - |  |  | 300 |  |  | - |
| Corporate and Other Obligations |  |  | 160 |  |  | - |  |  | 160 |  |  | - |
| Equities |  |  | 90 |  |  | 90 |  |  | - |  |  | - |
| Interest in Limited Partnerships and |  |  |  |  |  |  |  |  |  |  |  |  |
| Limited Liability Companies |  |  | 162 |  |  | - |  |  | - |  |  | 162 |
| Commingled Funds |  |  | 1,310 |  |  | - |  |  | 1,310 |  |  | - |
| Total investments at fair value |  | $ | 2,150 |  | $ | 218 |  | $ | 1,770 |  | $ | 162 |
| Interest in Registered Investment Companies (1) |  |  | 54 |  |  |  |  |  |  |  |  |  |
| Interest in Limited Partnerships and |  |  |  |  |  |  |  |  |  |  |  |  |
| Limited Liability Companies (1) |  |  | 81 |  |  |  |  |  |  |  |  |  |
| Interest and Dividend Receivable |  |  | 5 |  |  |  |  |  |  |  |  |  |
| Due from Broker for Securities Sold |  |  | 11 |  |  |  |  |  |  |  |  |  |
| Value of Funds Held in Insurance Co. |  |  | 5 |  |  |  |  |  |  |  |  |  |
| Due to Broker for Securities Purchased |  |  | (38) |  |  |  |  |  |  |  |  |  |
| Total Plan Assets, at Fair Value |  | $ | 2,268 |  |  |  |  |  |  |  |  |  |
(1)In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. These balances are intended to permit reconciliation of the fair value hierarchy to the plan asset amounts presented in Note 18 - Retirement Plans.
Changes In Fair Value of Plan's Level 3 Assets |
|  |  | Interest in Limited Partnerships and Limited Liability Companies |
| ($ in millions) |  | 2024 |  | 2023 |
| Balance at beginning of year |  | $ | 162 |  | $ | 156 |
| Realized gains |  |  | 15 |  |  | 13 |
| Unrealized (loss) gain |  |  | (1) |  |  | 6 |
| Purchases |  |  | - |  |  | - |
| Sales and distributions |  |  | (15) |  |  | (13) |
| Balance at end of year |  | $ | 161 |  | $ | 162 |
Redemption Of The Plan's Level 3 Investments |
|  |  |  |  |  | Liquidation |  | Capitalization |
| ($ in millions) |  | Fair Value |  | Period |  | Rate |
| Interest in Limited Partnerships and Limited Liability Companies (2) |  |  |  |  |  |  |  |  |  |
| 426 E. Casino Road, LLC (1) |  | $ | 19 |  |  | N/A |  |  | 6.75% |
| 100 Comm Drive, LLC (1) |  |  | 10 |  |  | N/A |  |  | 8.25% |
| 100 CTE Drive, LLC (1) |  |  | 13 |  |  | N/A |  |  | 10.00% |
| 6430 Oakbrook Parkway, LLC (1) |  |  | 27 |  |  | N/A |  |  | 8.50% |
| 8001 West Jefferson, LLC (1) |  |  | 22 |  |  | N/A |  |  | 9.50% |
| 1500 MacCorkle Ave SE, LLC (1) |  |  | 11 |  |  | N/A |  |  | 10.00% |
| 400 S. Pike Road West, LLC (1) |  |  | 1 |  |  | N/A |  |  | 9.00% |
| 601 N. US 131, LLC (1) |  |  | 1 |  |  | N/A |  |  | 9.25% |
| 9260 E. Stockton Blvd., LLC (1) |  |  | 7 |  |  | N/A |  |  | 7.75% |
| 120 E. Lime Street, LLC (1) |  |  | 11 |  |  | N/A |  |  | 8.50% |
| 610 N. Morgan Street, LLC (1) |  |  | 39 |  |  | N/A |  |  | 8.25% |
| Total Interest in Limited Partnerships and Limited Liability Companies |  | $ | 161 |  |  |  |  |  |  |
(1)The entity invests in commercial real estate properties that are leased to Frontier, with the exception of the E. Casino Road property which is leased to a third party. The leases are triple net, whereby we are responsible for all expenses, including but not limited to, insurance, repairs and maintenance and payment of property taxes. (2)All Level 3 investments have the same redemption frequency (through the liquidation of underlying investments) and redemption notice period (none). The fair value of these properties is based on independent appraisals.
Fair Value Of Long-Term Debt |
|  |  | 2024 |  | 2023 |
|  |  |  | Carrying |  |  |  |  |  | Carrying |  |  |  |
| ($ in millions) |  |  | Amount |  |  | Fair Value |  |  | Amount |  |  | Fair Value |
| Total debt |  | $ | 11,569 |  | $ | 11,749 |  | $ | 11,231 |  | $ | 10,712 |

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