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Consolidated Statements Of Operations - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Consolidated Statements Of Operations [Abstract]        
Revenue $ 1,550 $ 1,489 $ 4,600 $ 4,431
Operating expenses:        
Cost of service 547 538 1,600 1,576
Selling, general, and administrative expenses 395 427 1,318 1,304
Depreciation and amortization 470 410 1,372 1,196
Restructuring costs and other charges 21 28 73 88
Total operating expenses 1,433 1,403 4,363 4,164
Operating income 117 86 237 267
Investment and other income (loss), net (See Note 12) (9) 29 54 117
Interest expense (198) (203) (595) (601)
Loss before income taxes (90) (88) (304) (217)
Income tax benefit (14) (6) (41) (13)
Net loss $ (76) $ (82) $ (263) $ (204)
Basic net loss per share attributable to Frontier common shareholders $ (0.30) $ (0.33) $ (1.05) $ (0.82)
Diluted net loss per share attributable to Frontier common shareholders $ (0.30) $ (0.33) $ (1.05) $ (0.82)
Total weighted average shares outstanding - basic 250,320 248,986 250,111 247,866
Total weighted average shares outstanding - diluted 250,320 248,986 250,111 247,866