Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,067	$ 2,162	$ 4,168	$ 4,361
Operating expenses:
Network access expenses	318	369	656	741
Network related expenses	445	478	901	961
Selling, general and administrative expenses	445	460	901	929
Depreciation and amortization	454	486	938	991
Goodwill impairment	5,449		5,449
Loss on disposal of Northwest Operations	384		384
Restructuring costs and other charges	31	2	59	6
Total operating expenses	7,526	1,795	9,288	3,628
Operating income (loss)	(5,459)	367	(5,120)	733
Investment and other income (loss), net	(9)	5	(18)	13
Pension settlement costs		25		25
Gain (loss) on extinguishment of debt			(20)	33
Interest expense	383	385	762	759
Loss before income taxes	(5,851)	(38)	(5,920)	(5)
Income tax benefit	(534)	(20)	(516)	(7)
Net income (loss)	(5,317)	(18)	(5,404)	2
Less: Dividends on preferred stock		54		107
Net loss attributable to Frontier common shareholders	$ (5,317)	$ (72)	$ (5,404)	$ (105)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (51.07)	$ (0.92)	$ (51.97)	$ (1.35)
Total weighted average shares outstanding - basic and diluted	104,118	78,026	103,987	77,685