Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,199	$ 2,356
Operating expenses:
Network access expenses	372	411
Network related expenses	483	493
Selling, general and administrative expenses	469	542
Depreciation and amortization	505	579
Acquisition and integration costs		2
Restructuring costs and other charges	4	12
Total operating expenses	1,833	2,039
Operating income	366	317
Investment and other income, net	8
Pension settlement costs		43
Gain on extinguishment of debt	33
Interest expense	374	388
Income (loss) before income taxes	33	(114)
Income tax expense (benefit)	13	(39)
Net income (loss)	20	(75)
Less: Dividends on preferred stock	53	54
Net loss attributable to Frontier common shareholders	$ (33)	$ (129)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (0.44)	$ (1.67)
Total weighted average shares outstanding - basic and diluted	77,416	77,591