Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements Of Operations [Abstract]
Revenue	$ 1,933	$ 2,101
Operating expenses:
Network access expenses	286	338
Network related expenses	444	456
Selling, general and administrative expenses	444	456
Depreciation and amortization	415	484
Loss on disposal of Northwest Operations	24
Restructuring costs and other charges	48	28
Total operating expenses	1,661	1,762
Operating income	272	339
Investment and other income (loss), net	5	(9)
Pension settlement costs	103
Loss on extinguishment of debt		(20)
Interest expense	383	379
Loss before income taxes	(209)	(69)
Income tax (benefit) expense	(23)	18
Net loss	$ (186)	$ (87)
Basic and diluted net loss per share attributable to Frontier common shareholders	$ (1.78)	$ (0.84)
Total weighted average shares outstanding - basic and diluted	104,363	103,885