Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Consolidated Statements Of Operations [Abstract]
Revenue	$ 1,801	$ 2,067	$ 3,734	$ 4,168
Operating expenses:
Network access expenses	255	318	541	656
Network related expenses	430	445	874	901
Selling, general and administrative expenses	407	445	851	901
Depreciation and amortization	397	454	812	938
Goodwill impairment		5,449		5,449
Loss on disposal of Northwest Operations	136	384	160	384
Restructuring costs and other charges	36	31	84	59
Total operating expenses	1,661	7,526	3,322	9,288
Operating income (loss)	140	(5,459)	412	(5,120)
Investment and other loss, net	(20)	(9)	(15)	(18)
Pension settlement costs	56		159
Loss on extinguishment of debt				(20)
Reorganization items, net	(142)		(142)
Interest expense (contractual interest for the three and six months ended were $372 million and $744 million, respectively)	160	383	543	762
Loss before income taxes	(238)	(5,851)	(447)	(5,920)
Income tax benefit	(57)	(534)	(80)	(516)
Net loss	$ (181)	$ (5,317)	$ (367)	$ (5,404)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (1.73)	$ (51.07)	$ (3.51)	$ (51.97)
Total weighted average shares outstanding - basic and diluted	104,525	104,118	104,437	103,987