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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Long-Term Debt and Credit Facilities - Exchange Offers and Consent Solicitations (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2026 USD ($)	Jun. 11, 2026 USD ($) debt_instrument
Long-term Debt and Credit Facilities
Debt modification expense	$ 9	$ 9
Qwest Corporation \| Senior Notes
Long-term Debt and Credit Facilities
Number of debt instruments issued \| debt_instrument			2
Qwest Corporation \| Senior Notes \| 6.500% Notes due 2051
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			6.50%
Debt instrument, face amount			$ 1,002
Qwest Corporation \| Senior Notes \| 6.750% Notes due 2052
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			6.75%
Debt instrument, face amount			$ 382
Qwest Corporation \| Senior Notes \| 6.500% Notes due 2056
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			6.50%
Debt instrument, face amount			$ 146
Qwest Corporation \| Senior Notes \| 6.750% Notes due 2057
Long-term Debt and Credit Facilities
Stated interest rate (as a percent)			6.75%
Debt instrument, face amount			$ 108