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Long-Term Debt (Long-Term Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Apr. 30, 2021
Debt Instrument [Line Items] |  |  |
Principal debt outstanding, beginning | $ 11,231 |  |
Principal Payments and Retirements | (412) |  |
New Borrowings | 750 |  |
Principal debt outstanding, ending | 11,569 |  |
Less: Debt issuance costs | (89) | $ (71) |
Less: Current portion | (10) | (15) |
Less: Debt premium / (discount) | (44) | (64) |
Plus: Unamortized fair value adjustments | 125 | 165 |
Long-term debt | $ 11,551 | $ 11,246 |
Long-term debt, fair value adjustment |  |  | $ (236)
Interest Rate | 6.996% |  |
Secured Debt Issued By Frontier [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt outstanding, beginning | $ 8,848 |  |
Principal Payments and Retirements | (412) |  |
Principal debt outstanding, ending | $ 8,436 |  |
Interest Rate | 6.837% |  |
Secured Debt Issued By Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt outstanding, beginning | $ 1,633 |  |
New Borrowings | 750 |  |
Principal debt outstanding, ending | $ 2,383 |  |
Interest Rate | 7.592% |  |
Unsecured Debt Issued By Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal debt outstanding, beginning | $ 750 |  |
Principal debt outstanding, ending | $ 750 |  |
Interest Rate | 6.899% |  |

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