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Net (Loss) Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2025
Net (Loss) Earnings Per Share [Abstract] |
Reconciliation Of Net (Loss) Income Per Share |
|  | For the three months ended September 30, |  | For the nine months ended September 30, |
| ($ in millions and shares in thousands, except per share amounts) | 2025 |  | 2024 |  | 2025 |  | 2024 |
| Net loss used for basic and diluted earnings |  |  |  |  |  |  |  |  |  |  |  |
| per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total basic net loss |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (76) |  | $ | (82) |  | $ | (263) |  | $ | (204) |
| Effect of loss related to dilutive stock units |  | - |  |  | - |  |  | - |  |  | - |
| Total diluted net loss |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (76) |  | $ | (82) |  | $ | (263) |  | $ | (204) |
| Basic earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares and unvested |  |  |  |  |  |  |  |  |  |  |  |
| restricted stock awards outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Less: Weighted average unvested restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Basic net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.30) |  | $ | (0.33) |  | $ | (1.05) |  | $ | (0.82) |
| Diluted earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Effect of dilutive performance stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Effect of dilutive restricted stock awards |  | - |  |  | - |  |  | - |  |  | - |
| Total weighted average shares outstanding - diluted |  | 250,320 |  |  | 248,986 |  |  | 250,111 |  |  | 247,866 |
| Diluted net loss per share |  |  |  |  |  |  |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.30) |  | $ | (0.33) |  | $ | (1.05) |  | $ | (0.82) |

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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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