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Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Principal debt outstanding, beginning	$ 11,569
Principal Payments and Retirements	(5)
New Borrowings	480
Principal debt outstanding, ending	12,044
Less: Debt issuance costs	(91)	$ (89)
Less: Current portion	(10)	(10)
Less: Debt premium / (discount)	(36)	(44)
Plus: Unamortized fair value adjustments	101	125
Long-term debt	12,008	$ 11,551
Long-term debt, fair value adjustment	236
Secured Debt Issued By Frontier [Member]
Debt Instrument [Line Items]
Principal debt outstanding, beginning	8,436
Principal Payments and Retirements	(5)
Principal debt outstanding, ending	8,431
Secured Debt Issued By Subsidiaries [Member]
Debt Instrument [Line Items]
Principal debt outstanding, beginning	2,383
New Borrowings	480
Principal debt outstanding, ending	2,863
Unsecured Debt Issued By Subsidiaries [Member]
Debt Instrument [Line Items]
Principal debt outstanding, beginning	750
Principal debt outstanding, ending	$ 750

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