Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements Of Operations [Abstract]
Revenue	$ 8,611	$ 9,128	$ 8,896
Operating expenses:
Network access expenses	1,441	1,597	1,470
Network related expenses	1,898	1,958	1,876
Selling, general and administrative expenses	1,815	2,017	2,081
Depreciation and amortization	1,954	2,184	2,031
Goodwill impairment	641	2,748
Acquisition and integration costs		25	436
Restructuring costs and other charges	35	82	91
Total operating expenses	7,784	10,611	7,985
Operating income (loss)	827	(1,483)	911
Investment and other income, net	13	1	4
Pension settlement costs	41	83
Gain (Loss) on early extinguishment of debt and debt exchanges	32	(88)	(7)
Interest expense	1,536	1,534	1,531
Loss before income taxes	(705)	(3,187)	(623)
Income tax benefit	(62)	(1,383)	(250)
Net loss	(643)	(1,804)	(373)
Less: Dividends on preferred stock	107	214	214
Net loss attributable to Frontier common shareholders	$ (750)	$ (2,018)	$ (587)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (8.37)	$ (25.99)	$ (7.61)
Total weighted average shares outstanding - Basic and diluted	89,683	77,736	77,607