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Net (Loss) Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2025
Net (Loss) Earnings Per Share [Abstract] |
Reconciliation Of Net (Loss) Income Per Share |
|  | For the three months ended ‎March 31, |
| ($ in millions and shares in thousands, except per share amounts) | 2025 |  | 2024 |
| Net loss used for basic and diluted earnings |  |  |  |  |  |
| per share: |  |  |  |  |  |
| Total basic net income (loss) |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (64) |  | $ | 1 |
| Effect of loss related to dilutive stock units |  | - |  |  | - |
| Total diluted net income (loss) |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (64) |  | $ | 1 |
| Basic earnings per share: |  |  |  |  |  |
| Total weighted average shares and unvested |  |  |  |  |  |
| restricted stock awards outstanding - basic |  | 249,830 |  |  | 246,301 |
| Less: Weighted average unvested restricted stock awards |  | - |  |  | - |
| Total weighted average shares outstanding - basic |  | 249,830 |  |  | 246,301 |
| Basic net earnings (loss) per share |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.26) |  | $ | - |
| Diluted earnings per share: |  |  |  |  |  |
| Total weighted average shares outstanding - basic |  | 249,830 |  |  | 246,301 |
| Effect of dilutive performance stock awards |  | - |  |  | 72 |
| Effect of dilutive restricted stock awards |  | - |  |  | 667 |
| Total weighted average shares outstanding - diluted |  | 249,830 |  |  | 247,040 |
| Diluted net earnings (loss) per share |  |  |  |  |  |
| attributable to Frontier common shareholders | $ | (0.26) |  | $ | 0.00 |

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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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