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Net (Loss) Income Per Common Share (Tables) | 12 Months Ended
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Dec. 31, 2024
Net (Loss) Income Per Common Share [Abstract] |
Reconciliation Of Net (Loss) Income Per Share |
|  |  | For the year ended |  | For the year ended |  | For the year ended |
| ($ in millions and shares in thousands, |  | December 31, |  | December 31, |  | December 31, |
| except per share amounts) |  | 2024 |  | 2023 |  | 2022 |
| Net (loss) income used for |  |  |  |  |  |  |  |  |  |
| basic and diluted earnings per share: |  |  |  |  |  |  |  |  |  |
| Net (loss) income attributable to Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Less: Dividends paid on unvested restricted stock awards |  |  | - |  |  | - |  |  | - |
| Total basic net income attributable to |  |  |  |  |  |  |  |  |  |
| Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Effect of loss related to dilutive stock units |  |  | - |  |  | - |  |  | - |
| Total diluted net (loss) income attributable to |  |  |  |  |  |  |  |  |  |
| Frontier common shareholders |  | $ | (322) |  | $ | 29 |  | $ | 441 |
| Basic earnings per share: |  |  |  |  |  |  |  |  |  |
| Total weighted average shares and |  |  |  |  |  |  |  |  |  |
| unvested restricted stock awards outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Less: Weighted average unvested restricted stock awards |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Basic net (loss) income per share attributable |  |  |  |  |  |  |  |  |  |
| to Frontier common shareholders |  | $ | (1.30) |  | $ | 0.12 |  | $ | 1.80 |
| Diluted earnings per share: |  |  |  |  |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  |  | 248,184 |  |  | 245,517 |  |  | 244,781 |
| Effect of dilutive units |  |  | - |  |  | 2,330 |  |  | - |
| Effect of dilutive restricted stock awards |  |  | - |  |  | 612 |  |  | 499 |
| Effect of dilutive performance stock awards |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - diluted |  |  | 248,184 |  |  | 248,459 |  |  | 245,280 |
| Diluted net (loss) income per share attributable to Frontier common shareholders |  | $ | (1.30) |  | $ | 0.12 |  | $ | 1.80 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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