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Net (Loss) Income Per Common Share (Reconciliation Of Net (Loss) Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Net (Loss) income attributable to Frontier common shareholders $ (322) $ 29 $ 441
Less: Dividends paid on unvested restricted stock awards
Total basic net income (loss) attributable to Frontier common shareholders (322) 29 441
Effect of loss related to dilutive stock units
Total diluted net income (loss) attributable to Frontier common shareholders $ (322) $ 29 $ 441
Total weighted average shares and unvested restricted stock awards outstanding - basic (in shares) 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) earnings per share attributable to Frontier common shareholders $ (1.30) $ 0.12 $ 1.80
Total weighted average shares outstanding - basic 248,184 245,517 244,781
Total weighted average shares outstanding - diluted 248,184 248,459 245,280
Diluted net (loss) earnings per share attributable to Frontier common shareholders $ (1.30) $ 0.12 $ 1.80
Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Effect of dilutive awards (in shares)   2,330  
Performance Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Effect of dilutive awards (in shares)
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Effect of dilutive awards (in shares)   612 499