Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2022
Operating expenses:
Restructuring costs and other charges		$ 19
Successor [Member]
Revenue	$ 1,444	1,576		$ 2,637	$ 4,350
Operating expenses:
Cost of service	544	590		986	1,643
Selling, general and administrative expenses	431	421		690	1,293
Depreciation and amortization	296	273		452	870
Restructuring costs and other charges	4	8		19	88
Total operating expenses	1,275	1,292		2,147	3,894
Operating income	169	284		490	456
Investment and other income (loss), net (See Note 10)	211	(37)		(39)	410
Pension settlement costs	(50)				(50)
Interest expense (See Note 8)	(135)	(90)		(152)	(356)
Income before income taxes	195	157		299	460
Income tax expense	75	31		74	174
Net income	$ 120	$ 126		$ 225	$ 286
Basic net earnings per share attributable to Frontier common shareholders	$ 0.49	$ 0.52		$ 0.92	$ 1.17
Diluted net earnings per share attributable to Frontier common shareholders	$ 0.49	$ 0.51		$ 0.92	$ 1.17
Total weighted average shares outstanding - basic	244,984	244,403		244,402	244,711
Total weighted average shares outstanding - diluted	245,212	245,667		245,600	245,080
Predecessor [Member]
Revenue			$ 2,231
Operating expenses:
Cost of service			830
Selling, general and administrative expenses			537
Depreciation and amortization			506
Restructuring costs and other charges			7
Total operating expenses			1,880
Operating income			351
Investment and other income (loss), net (See Note 10)			1
Reorganization items, net			4,171
Interest expense (See Note 8)			(118)
Income before income taxes			4,405
Income tax expense			(136)
Net income			$ 4,541
Basic net earnings per share attributable to Frontier common shareholders			$ 43.42
Diluted net earnings per share attributable to Frontier common shareholders			$ 43.28
Total weighted average shares outstanding - basic			104,584
Total weighted average shares outstanding - diluted			104,924