Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,162	$ 2,304	$ 4,361	$ 4,660
Operating expenses:
Network access expenses	369	408	741	819
Network related expenses	478	477	961	970
Selling, general and administrative expenses	460	531	929	1,073
Depreciation and amortization	486	552	991	1,131
Goodwill impairment		670		670
Acquisition and integration costs		12		14
Restructuring costs and other charges	2	29	6	41
Total operating expenses	1,795	2,679	3,628	4,718
Operating income (loss)	367	(375)	733	(58)
Investment and other income, net	5		13
Pension settlement costs	25	19	25	62
Gain (loss) on extinguishment of debt		(90)	33	(90)
Interest expense	385	388	759	776
Loss before income taxes	(38)	(872)	(5)	(986)
Income tax benefit	(20)	(210)	(7)	(249)
Net income (loss)	(18)	(662)	2	(737)
Less: Dividends on preferred stock	54	53	107	107
Net loss attributable to Frontier common shareholders	$ (72)	$ (715)	$ (105)	$ (844)
Basic net loss per share attributable to Frontier common shareholders	$ (0.92)	$ (9.20)	$ (1.35)	$ (10.88)
Diluted net loss per share attributable to Frontier common shareholders	$ (0.92)	$ (9.21)	$ (1.35)	$ (10.89)
Total weighted average shares outstanding - basic	78,026	77,795	77,685	77,679
Total weighted average shares outstanding - diluted	78,026	77,951	77,685	77,835