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Long-Term Debt and Credit Facilities - Transaction Support Agreement Transactions - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Long-term Debt and Credit Facilities |  |  |  |
Aggregate principal |  | $ 744 |  |
Net (loss) gain on early retirement of debt | $ 275 | 348 | $ 618 | $ 214
Reduction in debt from fair value adjustment |  | 492 |  |
Payment for lender fees |  | 209 |  |
Payment for third-party costs |  | 174 |  |
Debt instrument, capitalized lender fees |  | 52 |  |
Third party costs capitalized |  | 62 |  |
Gain (Loss) On Extinguishment Of Debt |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Debt instrument, lender fees |  | 157 |  |
Selling, General and Administrative Expenses |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Debt instrument, third-party costs |  | 112 |  |
Level 3 Financing, Inc. |  |  |  |
Long-term Debt and Credit Facilities |  |  |  |
Aggregate principal |  | $ 2,600 |  |

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