Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements Of Operations [Abstract]
Revenue	$ 2,101	$ 2,199
Operating expenses:
Network access expenses	338	372
Network related expenses	456	483
Selling, general and administrative expenses	456	469
Depreciation and amortization	484	505
Restructuring costs and other charges	28	4
Total operating expenses	1,762	1,833
Operating income	339	366
Investment and other income (loss), net	(9)	8
Gain (loss) on extinguishment of debt	(20)	33
Interest expense	379	374
Income (loss) before income taxes	(69)	33
Income tax expense	18	13
Net income (loss)	(87)	20
Less: Dividends on preferred stock		53
Net loss attributable to Frontier common shareholders	$ (87)	$ (33)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (0.84)	$ (0.44)
Total weighted average shares outstanding - basic and diluted	103,885	77,416