Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2022	Apr. 30, 2021	Jun. 30, 2022
Operating expenses:
Restructuring costs and other charges		$ 11
Successor [Member]
Revenue		1,061	$ 1,459		$ 2,906
Operating expenses:
Cost of service		396	546		1,099
Selling, general and administrative expenses		269	427		862
Depreciation and amortization		179	290		574
Restructuring costs and other charges		11	30		84
Total operating expenses		855	1,293		2,619
Operating income		206	166		287
Investment and other income (loss), net		(2)	122		199
Interest expense (See Note 8)		(62)	(118)		(221)
Income before income taxes		142	170		265
Income tax expense (benefit)		43	69		99
Net income		$ 99	$ 101		$ 166
Basic net earnings per share attributable to Frontier common shareholders		$ 0.41	$ 0.41		$ 0.68
Diluted net earnings per share attributable to Frontier common shareholders		$ 0.41	$ 0.41		$ 0.68
Total weighted average shares outstanding - basic		244,401	244,723		244,592
Total weighted average shares outstanding - diluted		244,401	244,723		244,831
Predecessor [Member]
Revenue	$ 555			$ 2,231
Operating expenses:
Cost of service	210			830
Selling, general and administrative expenses	129			537
Depreciation and amortization	119			506
Restructuring costs and other charges	5			7
Total operating expenses	463			1,880
Operating income	92			351
Investment and other income (loss), net	(1)			1
Reorganization items, net	4,196			4,171
Interest expense (See Note 8)	(29)			(118)
Income before income taxes	4,258			4,405
Income tax expense (benefit)	(223)			(136)
Net income	$ 4,481			$ 4,541
Basic net earnings per share attributable to Frontier common shareholders	$ 42.81			$ 43.42
Diluted net earnings per share attributable to Frontier common shareholders	$ 42.68			$ 43.28
Total weighted average shares outstanding - basic	104,662			104,584
Total weighted average shares outstanding - diluted	105,002			104,924