Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements Of Operations [Abstract]
Revenue	$ 8,107	$ 8,611	$ 9,128
Operating expenses:
Network access expenses	1,247	1,441	1,597
Network related expenses	1,810	1,898	1,958
Selling, general and administrative expenses	1,804	1,815	2,017
Depreciation and amortization	1,780	1,954	2,184
Goodwill Impairment	5,725	641	2,748
Loss on disposal of Northwest Operations	446
Acquisition and integration costs			25
Restructuring costs and other charges	168	35	82
Total operating expenses	12,980	7,784	10,611
Operating income (loss)	(4,873)	827	(1,483)
Investment and other income (loss), net	(37)	13	1
Pension settlement costs	57	41	83
Gains (Loss) on early extinguishment of debt	(20)	32	(88)
Interest expense	1,535	1,536	1,534
Loss before income taxes	(6,522)	(705)	(3,187)
Income tax benefit	(611)	(62)	(1,383)
Net loss	(5,911)	(643)	(1,804)
Less: Dividends on preferred stock		107	214
Net loss attributable to Frontier common shareholders	$ (5,911)	$ (750)	$ (2,018)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (56.80)	$ (8.37)	$ (25.99)
Total weighted average shares outstanding - basic and diluted	104,065	89,683	77,736