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Convertible Promissory Note (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	Aug. 27, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Interest rate		6.774%	6.996%
Convertible debt, outstanding		$ 50
Convertible Unsecured Promissory Note [Member]
Debt Instrument [Line Items]
Interest rate margin	0.87%
Interest rate		5.05%
Convertible debt, outstanding	$ 50
Debt instrument, conversion description		Upon termination of the Merger Agreement, any outstanding borrowings under the Convertible Note, and any accrued but unpaid interest thereon, will automatically, subject to limited exceptions, convert into shares of Frontier common stock at a conversion price of $38.50 per share.
Conversion price, per share		$ 38.50
Convertible Unsecured Promissory Note [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, maximum initial principal amount	$ 200

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The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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