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Long-Term Debt and Credit Facilities - Long-Term Debt Maturities (Details) $ in Millions | Sep. 30, 2025 USD ($)
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Debt Disclosure [Abstract] |
2025 (remaining three months) | $ 25
2026 | 89
2027 | 139
2028 | 716
2029 | 3,761
2030 and thereafter | 13,498
Total long-term debt | $ 18,228

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- Definition Long-Term Debt And Lease Obligation, Maturity, Remainder Of Fiscal Year + References No definition available. + Details
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Balance Type: | credit
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- Definition Long-Term Debt And Lease Obligation, Maturity, Year Five And Thereafter + References No definition available. + Details
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- Definition Long-Term Debt And Lease Obligation, Maturity, Year Four + References No definition available. + Details
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Namespace Prefix: | lumn_
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- Definition Long-Term Debt And Lease Obligation, Maturity, Year One + References No definition available. + Details
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- Definition Long-Term Debt And Lease Obligation, Maturity, Year Three + References No definition available. + Details
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Namespace Prefix: | lumn_
Data Type: | xbrli:monetaryItemType
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- Definition Long-Term Debt And Lease Obligation, Maturity, Year Two + References No definition available. + Details
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Namespace Prefix: | lumn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of long-term debt and lease obligation, including portion classified as current. + References No definition available. + Details
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