Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Valuation allowance	$ 8	$ 8
Net deferred tax liabilities	1,274	1,247
Deferred income taxes, net	1,276	1,249
Deferred income tax assets, net	2	2
Unrecognized tax benefits that would impact effective income tax rate	407	422
Liabilities recorded for interest related to uncertain tax positions	75	60
Related Party Transaction [Line Items]
Income taxes paid (received)	697	556	$ 539
Qwest Services Corporation
Related Party Transaction [Line Items]
Income taxes paid (received)	$ 697	$ 556	$ (539)

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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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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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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

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