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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2024
Income Taxes [Abstract] |
Reconciliation Of Provision For Income Taxes |
|  |  | For the year ended |  | For the year ended |  | For the year ended |
|  |  | ended December 31, |  | December 31, |  | December 31, |
|  |  | 2024 |  | 2023 |  | 2022 |
| Consolidated tax provision at federal statutory rate |  | 21.0 | % |  | 21.0 | % |  | 21.0 | % |
| State income tax provisions, net of federal income tax benefit |  | (10.5) |  |  | 13.7 |  |  | 4.8 |  |
| Tax reserve adjustment |  | - |  |  | - |  |  | 0.6 |  |
| Changes in certain deferred tax balances |  | 0.4 |  |  | 23.4 |  |  | (0.5) |  |
| Nondeductible transaction costs |  | (1.5) |  |  | - |  |  | - |  |
| Nondeductible Executive Compensation under Sec. 162(m) |  | (2.6) |  |  | 12.2 |  |  | 2.0 |  |
| Sec. 162(f) nondeductible penalties |  | (0.3) |  |  | 3.1 |  |  | 0.3 |  |
| All other, net |  | 0.5 |  |  | 1.9 |  |  | (1.8) |  |
| Effective tax rate |  | 7.0 | % |  | 75.3 | % |  | 26.4 | % |
Components Of Net Deferred Income Tax Liability (Asset) |
|  |  |  | December 31, |  |  | December 31, |
| ($ in millions) |  |  | 2024 |  |  | 2023 |
| Deferred income tax liabilities: |  |  |  |  |  |  |
| Property, plant, and equipment basis differences |  | $ | 1,753 |  | $ | 1,342 |
| Intangibles |  |  | 94 |  |  | 184 |
| Deferred revenue/expense |  |  | (7) |  |  | (8) |
| Other, net |  |  | 48 |  |  | 45 |
|  |  | $ | 1,888 |  | $ | 1,563 |
| Deferred income tax assets: |  |  |  |  |  |  |
| Pension liability |  | $ | 26 |  | $ | 48 |
| Tax operating loss carryforward |  |  | 705 |  |  | 476 |
| Employee benefits |  |  | 75 |  |  | 83 |
| Interest expense deduction |  |  |  |  |  |  |
| limitation carryforward |  |  | 468 |  |  | 260 |
| Accrued expenses |  |  | 84 |  |  | 80 |
| Lease obligations |  |  | 131 |  |  | 111 |
| Tax credit |  |  | 45 |  |  | 32 |
| Allowance for doubtful accounts |  |  | 16 |  |  | 11 |
| Other, net |  |  | (28) |  |  | (1) |
|  |  |  | 1,522 |  |  | 1,100 |
| Less: Valuation allowance |  |  | (243) |  |  | (180) |
| Net deferred income tax asset |  |  | 1,279 |  |  | 920 |
| Net deferred income tax liability |  | $ | 609 |  | $ | 643 |
Schedule Of Components Of Income Tax Expense (Benefit) |
|  | For the year ended |  | For the year ended |  | For the year ended |
|  | December 31, |  | December 31, |  | December 31, |
| ($ in millions) | 2024 |  | 2023 |  | 2022 |
| Income tax expense (benefit): |  |  |  |  |  |  |  |  |
| Current: |  |  |  |  |  |  |  |  |
| Federal | $ | - |  | $ | - |  | $ | - |
| State |  | 4 |  |  | 10 |  |  | (7) |
| Total Current |  | 4 |  |  | 10 |  |  | (7) |
| Deferred: |  |  |  |  |  |  |  |  |
| Federal |  | (69) |  |  | 58 |  |  | 125 |
| State |  | 41 |  |  | 20 |  |  | 40 |
| Total Deferred |  | (28) |  |  | 78 |  |  | 165 |
| Total income tax expense (benefit) |  | (24) |  |  | 88 |  |  | 158 |
| Income taxes charged (credited) to equity of Frontier: |  |  |  |  |  |  |  |  |
| Deferred income taxes (benefits) arising from the recognition of additional pension/OPEB liability |  | (6) |  |  | 6 |  |  | 8 |
| Total income taxes charged (credited) to equity of Frontier |  | - |  |  | - |  |  | - |
| Total income tax expense (benefit) | $ | (30) |  | $ | 94 |  | $ | 166 |
Changes In The Balance Of Unrecognized Tax Benefits |
| ($ in millions) |  | December 31, |  | December 31, |  | December 31,
|  |  | 2024 |  | 2023 |  | 2022
| Unrecognized tax benefits - beginning of period |  | $ | 5 |  | $ | 5 |  | $ | 1
| Gross decreases - prior period tax positions |  |  | - |  |  | (1) |  |  | -
| Gross increases (decrease) - current period tax positions |  |  | 2 |  |  | 1 |  |  | 4
| Unrecognized tax benefits - end of period |  | $ | 7 |  | $ | 5 |  | $ | 5

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