Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements Of Operations [Abstract]
Revenue	$ 1,997	$ 2,126	$ 6,165	$ 6,487
Operating expenses:
Network access expenses	307	353	963	1,094
Network related expenses	464	476	1,365	1,437
Selling, general and administrative expenses	445	445	1,346	1,374
Depreciation and amortization	422	471	1,360	1,462
Goodwill impairment	276	400	5,725	400
Loss on disposal of Northwest Operations	30		414
Restructuring costs and other charges	27	14	86	20
Total operating expenses	1,971	2,159	11,259	5,787
Operating income (loss)	26	(33)	(5,094)	700
Investment and other income (loss), net	(10)	3	(28)	16
Pension settlement costs		9		34
Gain (loss) on extinguishment of debt		(2)	(20)	31
Interest expense	382	389	1,144	1,148
Loss before income taxes	(366)	(430)	(6,286)	(435)
Income tax benefit	(21)	(4)	(537)	(11)
Net loss	(345)	(426)	(5,749)	(424)
Less: Dividends on preferred stock				107
Net loss attributable to Frontier common shareholders	$ (345)	$ (426)	$ (5,749)	$ (531)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (3.31)	$ (4.11)	$ (55.26)	$ (6.09)
Total weighted average shares outstanding - basic and diluted	104,135	103,665	104,031	87,138