Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Successor [Member]
Revenue	$ 1,447,000
Operating expenses:
Cost of service	553,000
Selling, general and administrative expenses	435,000
Depreciation and amortization	284,000
Restructuring costs and other charges	54,000
Total operating expenses	1,326,000
Operating income	121,000
Investment and other income, net	77,000
Interest expense (see Note 8)	(103,000)
Income before income taxes	95,000
Income tax expense	30,000
Net income	$ 65,000
Basic net earnings per share attributable to Frontier common shareholders	$ 0.27
Diluted net earnings per share attributable to Frontier common shareholders	$ 0.26
Total weighted average shares outstanding - basic	244,433
Total weighted average shares outstanding - diluted	245,251
Predecessor [Member]
Revenue		$ 1,676,000
Operating expenses:
Cost of service		620,000
Selling, general and administrative expenses		408,000
Depreciation and amortization		387,000
Restructuring costs and other charges		2,000
Total operating expenses		1,417,000
Operating income		259,000
Investment and other income, net		2,000
Reorganization items, net		(25,000)
Interest expense (see Note 8)		(89,000)
Income before income taxes		147,000
Income tax expense		87,000
Net income		$ 60,000
Basic net earnings per share attributable to Frontier common shareholders		$ 0.57
Diluted net earnings per share attributable to Frontier common shareholders		$ 0.57
Total weighted average shares outstanding - basic		104,556
Total weighted average shares outstanding - diluted		104,896