Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,304	$ 2,608	$ 4,660	$ 3,963
Operating expenses:
Network access expenses	408	453	819	613
Network related expenses	477	546	971	872
Selling, general and administrative expenses	531	596	1,075	953
Depreciation and amortization	552	575	1,131	891
Goodwill Impairment	670		670
Acquisition and integration costs	12	127	14	265
Pension settlement costs	19		62
Restructuring costs and other charges	29		41
Total operating expenses	2,698	2,297	4,783	3,594
Operating income (loss)	(394)	311	(123)	369
Investment and other income, net			3	11
Loss on extinguishment of debt and debt exchanges	90		90
Interest expense	388	386	776	759
Loss before income taxes	(872)	(75)	(986)	(379)
Income tax benefit	(210)	(48)	(249)	(166)
Net loss	(662)	(27)	(737)	(213)
Less: Dividends on preferred stock	53	53	107	107
Net loss attributable to Frontier common shareholders	$ (715)	$ (80)	$ (844)	$ (320)
Basic net loss per share attributable to Frontier common shareholders	$ (9.20)	$ (1.05)	$ (10.88)	$ (4.14)
Diluted net loss per share attributable to Frontier common shareholders	$ (9.21)	$ (1.05)	$ (10.89)	$ (4.14)
Total weighted average shares outstanding - basic	77,795	77,625	77,679	77,611
Total weighted average shares outstanding - diluted	77,951	77,625	77,835	77,611