Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Long-Term Debt and Credit Facilities - 2026 Debt Transactions - Senior Secured Notes Issuance and Second Lien Tender Offers (Details) - USD ($) $ in Millions	Mar. 31, 2026	Feb. 02, 2026	Jan. 09, 2026
Long-term Debt and Credit Facilities
Repurchased face amount	$ 5	$ 4,765
Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Repurchased face amount			$ 607
Level 3 Financing, Inc. \| Senior Notes \| 4.875% Second Lien Notes due 2029
Long-term Debt and Credit Facilities
Repurchased face amount	$ 1		$ 595
Stated interest rate (as a percent)	4.875%		4.875%
Level 3 Financing, Inc. \| Senior Notes \| 4.500% Second Lien Notes due 2030
Long-term Debt and Credit Facilities
Repurchased face amount			$ 8
Stated interest rate (as a percent)			4.50%
Level 3 Financing, Inc. \| Senior Notes \| 3.875% Second Lien Notes due 2030
Long-term Debt and Credit Facilities
Repurchased face amount			$ 4
Stated interest rate (as a percent)			3.875%