Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,251	$ 2,524	$ 6,911	$ 6,487
Operating expenses:
Network access expenses	390	440	1,209	1,053
Network related expenses	497	527	1,468	1,399
Selling, general and administrative expenses	486	582	1,561	1,535
Depreciation and amortization	539	578	1,670	1,469
Goodwill Impairment			670
Acquisition and integration costs	1	122	15	387
Pension settlement costs	15		77
Restructuring costs and other charges	14	11	55	11
Total operating expenses	1,942	2,260	6,725	5,854
Operating income	309	264	186	633
Investment and other income, net	2	3	5	14
Loss on extinguishment of debt and debt exchanges	(1)	7	89	7
Interest expense	381	386	1,157	1,145
Loss before income taxes	(69)	(126)	(1,055)	(505)
Income tax benefit	(31)	(46)	(280)	(212)
Net loss	(38)	(80)	(775)	(293)
Less: Dividends on preferred stock	54	54	161	161
Net loss attributable to Frontier common shareholders	$ (92)	$ (134)	$ (936)	$ (454)
Basic net loss per share attributable to Frontier common shareholders	$ (1.19)	$ (1.73)	$ (12.06)	$ (5.87)
Diluted net loss per share attributable to Frontier common shareholders	$ (1.19)	$ (1.73)	$ (12.07)	$ (5.87)
Total weighted average shares outstanding - basic	77,797	77,612	77,714	77,608
Total weighted average shares outstanding - diluted	77,797	77,612	77,875	77,608