Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Valuation allowance	$ 0	$ 0
Net deferred tax liabilities	1,334,000,000	1,317,000,000
Unrecognized tax benefits that would impact effective income tax rate	0
Liabilities recorded for interest related to uncertain tax positions	160,000,000	125,000,000
Related Party Transaction [Line Items]
Income taxes paid (received)	497,000,000	509,000,000	$ 673,000,000
Unfavorable impact of non-deductible goodwill impairments		505,000,000
Qwest Services Corporation
Related Party Transaction [Line Items]
Income taxes paid (received)	$ 497,000,000	$ 509,000,000	$ 673,000,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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Amount, after refund, of cash paid to foreign, federal, state, and local jurisdictions as income tax.

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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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Amount of interest expense accrued for an underpayment of income taxes.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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