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Net (Loss) Earnings Per Share | 3 Months Ended
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Mar. 31, 2025
Net (Loss) Earnings Per Share [Abstract] |
Net (Loss) Earnings Per Share | (14) Net (Loss) Earnings Per Share: The reconciliation of the net (loss) income per common share calculation is as follows:
|  | 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 |
In calculating diluted net loss per common share, the effect of certain outstanding RSUs and PSUs has been excluded from the computation as the effect would be antidilutive. For the three months ended March 31, 2025, RSUs of approximately 868,000 and PSUs of approximately 807,000 have been excluded. In calculating diluted net income per common share for the three months ended March 31, 2025 and 2024, the effect of certain outstanding PSUs is included in the computation as their respective performance metrics have been satisfied as of March 31, 2025 and 2024, respectively.

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