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Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Consolidated Statements Of Operations [Abstract]      
Revenue $ 5,937 $ 5,751 $ 5,787
Operating expenses:      
Cost of service 2,110 2,125 2,169
Selling, general, and administrative expenses 1,725 1,646 1,745
Depreciation and amortization 1,625 1,415 1,182
Restructuring costs and other charges 124 73 99
Total operating expenses 5,584 5,259 5,195
Operating income 353 492 592
Investment and other income (loss), net (See Note 11) 105 278 554
Pension settlement costs   (55)
Interest expense (See Note 8) (804) (653) (492)
(Loss) income before income taxes (346) 117 599
Income tax expense (benefit) (24) 88 158
Net (loss) income $ (322) $ 29 $ 441
Basic net (loss) earnings per share attributable to Frontier common shareholders $ (1.30) $ 0.12 $ 1.80
Diluted net (loss) earnings per share attributable to Frontier common shareholders $ (1.30) $ 0.12 $ 1.80
Total weighted average shares outstanding - basic 248,184 245,517 244,781
Total weighted average shares outstanding - diluted 248,184 248,459 245,280