Net Income (Loss) Per Common Share	12 Months Ended
	Dec. 31, 2021
Net Income (Loss) Per Common Share [Abstract]
Net Income (Loss) Per Common Share	‎ (17) Net Income (Loss) Per Common Share: The reconciliation of the net loss per common share calculation is as follows: Successor Predecessor For the eight For the four For the year For the year months ended months ended ended ended December 31, April 30, December 31, December 31, 2021 2021 2020 2019 ($ in millions and shares in thousands, except per share amounts) Net income (loss) used for basic and diluted earnings (loss) per share: Net income (loss) attributable to Frontier common shareholders $ 414  $ 4,541  $ (402) $ (5,911) Less: Dividends paid on unvested restricted stock awards - - - - Total basic net income (loss) attributable to Frontier common shareholders $ 414  $ 4,541  $ (402) $ (5,911) Effect of loss related to dilutive stock units - - - - Total diluted net income (loss) attributable to Frontier common shareholders $ 414  $ 4,541  $ (402) $ (5,911) Basic earnings (loss) per share: Total weighted average shares and unvested restricted stock awards outstanding - basic 244,405  104,799  104,944  105,356  Less: Weighted average unvested restricted stock awards - (215) (477) (1,291) Total weighted average shares outstanding - basic 244,405  104,584  104,467  104,065  Basic net income (loss) per share attributable to Frontier common shareholders $ 1.69  $ 43.42  $ (3.85) $ (56.80) Diluted earnings (loss) per share: Total weighted average shares outstanding - basic 244,405  104,584  104,467  104,065  Effect of dilutive shares 1,480  340  - - Total weighted average shares outstanding - diluted 245,885  104,924  104,467  104,065  Diluted net income (loss) per share attributable to Frontier common shareholders $ 1.68  $ 43.28  $ (3.85) $ (56.80) In calculating diluted net income per common share for the years ended December 31, 2021, and diluted net loss for 2020 and 2019 the effect of all common stock equivalents is excluded from the computation as the effect would be antidilutive. Stock UnitsAs of December 31, 2021, there were no stock units outstanding. As of April 30, 2021, there were 339,544 stock units issued under Old Frontier director and employee compensation plans that were included in the diluted EPS calculation for the four months ended April 30, 2021 as the effect would be dilutive.