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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net (Loss) Earnings Per Share [Abstract]        
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)
Total weighted average shares and unvested restricted stock awards outstanding - basic (in shares) 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)
Total weighted average shares outstanding - basic 250,320 248,986 250,111 247,866
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)