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Employee Benefits - Other Benefit Plans (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Retirement Benefits [Abstract] |  |  |
Active health care benefit expenses | $ 281 | $ 288 | $ 296
Participating employees' contribution to health care plan | $ 79 | $ 89 | 101
Common stock included in the assets of the Defined Contribution Plan (in shares) | 8 | 9 |
Expenses related to the 401(k) Plan | $ 82 | $ 87 | $ 91

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- Definition The entity's health care expenses for its active employees. + References No definition available. + Details
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Namespace Prefix: | lumn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The contribution made by active employees for the health care benefit provided to the employees. + References No definition available. + Details
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Namespace Prefix: | lumn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of shares of the Entity's common stock held by and included in the assets of the Entity's Defined Contribution Plan. + References No definition available. + Details
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Namespace Prefix: | lumn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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