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 - Supplemental Indentures and Lumen Parent Guarantee (Details) - USD ($) $ in Millions	Jun. 30, 2026	May 21, 2026	Apr. 30, 2026	Mar. 31, 2026	Feb. 02, 2026	Jan. 09, 2026
Long-term Debt and Credit Facilities
Repurchased face amount	$ 14			$ 5	$ 4,765
Level 3 Financing, Inc.
Long-term Debt and Credit Facilities
Repurchased face amount		$ 766				$ 607
Level 3 Financing, Inc. \| Senior Notes \| First Lien Notes Due 2033
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			6.875%
Level 3 Financing, Inc. \| Senior Notes \| First Lien Notes Due 2034
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			7.00%