Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Operations [Abstract]
Revenue	$ 9,128	$ 8,896	$ 5,576
Operating expenses:
Network access expenses	1,597	1,470	640
Network related expenses	1,959	1,887	1,287
Selling, general and administrative expenses	2,018	2,093	1,346
Depreciation and amortization	2,184	2,031	1,320
Goodwill impairment	2,748
Acquisition and integration costs	25	436	236
Pension settlement costs	83
Restructuring costs and other charges	82	91	2
Total operating expenses	10,696	8,008	4,831
Operating income (loss)	(1,568)	888	745
Investment and other income, net	3	27	7
Loss on early extinguishment of debt and debt exchanges	88	7
Interest expense	1,534	1,531	1,113
Loss before income taxes	(3,187)	(623)	(361)
Income tax benefit	(1,383)	(250)	(165)
Net loss	(1,804)	(373)	(196)
Less: Dividends on preferred stock	214	214	120
Net loss attributable to Frontier common shareholders	$ (2,018)	$ (587)	$ (316)
Basic net loss per share attributable to common shareholders of Frontier (in dollars per share)	$ (25.99)	$ (7.61)	$ (4.41)
Diluted net loss per share attributable to Frontier common shareholders	$ (25.99)	$ (7.61)	$ (4.41)
Total weighted average shares outstanding - basic	77,736	77,607	72,308
Total weighted average shares outstanding - diluted	77,736	77,607	72,308