Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,126	$ 2,251	$ 6,487	$ 6,911
Operating expenses:
Network access expenses	353	390	1,094	1,209
Network related expenses	476	498	1,437	1,468
Selling, general and administrative expenses	445	487	1,374	1,560
Depreciation and amortization	471	539	1,462	1,670
Goodwill impairment	400		400	670
Acquisition and integration costs		1		15
Restructuring costs and other charges	14	14	20	55
Total operating expenses	2,159	1,929	5,787	6,647
Operating income (loss)	(33)	322	700	264
Investment and other income, net	3	4	16	4
Pension settlement costs	9	15	34	77
Gain (loss) on extinguishment of debt	(2)	1	31	(89)
Interest expense	389	381	1,148	1,157
Loss before income taxes	(430)	(69)	(435)	(1,055)
Income tax benefit	(4)	(31)	(11)	(280)
Net loss	(426)	(38)	(424)	(775)
Less: Dividends on preferred stock		54	107	161
Net loss attributable to Frontier common shareholders	$ (426)	$ (92)	$ (531)	$ (936)
Basic net loss per share attributable to Frontier common shareholders	$ (4.11)	$ (1.19)	$ (6.09)	$ (12.06)
Diluted net loss per share attributable to Frontier common shareholders	$ (4.11)	$ (1.19)	$ (6.09)	$ (12.07)
Total weighted average shares outstanding - basic	103,665	77,797	87,138	77,714
Total weighted average shares outstanding - diluted	103,665	77,797	87,138	77,875