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Net (Loss) Earnings Per Share (Reconciliation Of Net (Loss) Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net (Loss) Earnings Per Share [Abstract]        
Total basic net loss attributable to Frontier common shareholders $ (123) $ (123) $ (187) $ (122)
Effect of loss related to dilutive stock units
Total diluted net loss attributable to Frontier common shareholders $ (123) $ (123) $ (187) $ (122)
Total weighted average shares and unvested restricted stock awards outstanding - basic (in shares) 250,259 248,754 250,019 247,382
Less: Weighted average unvested restricted stock awards
Total weighted average shares outstanding - basic 250,259 248,754 250,019 247,382
Basic net loss per share attributable to Frontier common shareholders $ (0.49) $ (0.49) $ (0.75) $ (0.49)
Total weighted average shares outstanding - basic 250,259 248,754 250,019 247,382
Total weighted average shares outstanding - diluted 250,259 248,754 250,019 247,382
Diluted net loss per share attributable to Frontier common shareholders $ (0.49) $ (0.49) $ (0.75) $ (0.49)