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Long-Term Debt and Credit Facilities - Transaction Support Agreement Transactions - New Debt Issuances (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Nov. 30, 2024 | Sep. 24, 2024
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 11,925 |  |
Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, periodic payment | 66 |  |
Senior Notes |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount |  | $ 393 | $ 848
Term Loan A | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | 357 |  |
Term Loan B-1 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | 1,606 |  |
Term Loan B-1 | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | 1,199 |  |
Term Loan B-2 | Term Loan |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | 1,606 |  |
Term Loan B-2 | Term Loan | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,199 |  |
4.125% Superpriority Notes due 2029-2030 | Senior Notes |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 4.125% |  |
Debt instrument, face amount | $ 808 |  |
10.500% First Lien Notes due 2029 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 10.50% |  |
Debt instrument, face amount | $ 668 |  |
11.000% First Lien Notes due 2029 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 11.00% |  |
Debt instrument, face amount | $ 1,575 |  |
4.875% Second Lien Notes due 2029 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 4.875% |  |
Debt instrument, face amount | $ 606 |  |
10.750% First Lien Notes due 2030 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 10.75% |  |
Debt instrument, face amount | $ 678 |  |
4.500% Second Lien Notes due 2030 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 4.50% |  |
Debt instrument, face amount | $ 712 |  |
3.875% Second Lien Notes due 2030 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 3.875% |  |
Debt instrument, face amount | $ 458 |  |
4.000% Second Lien Notes due 2031 | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Stated interest rate (as a percent) | 4.00% |  |
Debt instrument, face amount | $ 453 |  |
11.000% First Lien Notes Due 2029- One | Senior Notes | Level 3 Financing, Inc. |  |  |
Long-term Debt and Credit Facilities |  |  |
Debt instrument, face amount | $ 1,375 |  |

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