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Background and Summary of Significant Accounting Policies - Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) reporting_unit segment | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Statement [Line Items] |  |  |
Advertising expense | $ 26,000,000 | $ 24,000,000 | $ 25,000,000
Bank overdrafts |  | 0 |
Accounts receivable, period past due | 30 days |  |
Number of reporting units | reporting_unit | 1 |  |
Number of operating segments | segment | 1 |  |
Customer relationships |  |  |
Statement [Line Items] |  |  |
Finite-lived intangible assets, maximum useful life | 10 years |  |
Capitalized software |  |  |
Statement [Line Items] |  |  |
Finite-lived intangible assets, maximum useful life | 7 years |  |
Qwest Communications International, Inc. | Pension, Supplemental and Other Postretirement Benefit Plans |  |  |
Statement [Line Items] |  |  |
Pension settlement term | 30 years |  |
Repayments on affiliate obligation | $ 61,000,000 | 46,000,000 |
Qwest Communications International, Inc. | Pension, Supplemental and Other Postretirement Benefit Plans |  |  |
Statement [Line Items] |  |  |
Repayments on affiliate obligation | $ 61,000,000 | $ 46,000,000 |
Minimum |  |  |
Statement [Line Items] |  |  |
Contract term | 1 year |  |
Maximum |  |  |
Statement [Line Items] |  |  |
Contract term | 5 years |  |
Customer relationship period for revenue recognition | 20 years |  |
Average | Consumer customers, average contract life |  |  |
Statement [Line Items] |  |  |
Customer life | 32 months |  |
Average | Business customer, average contract life |  |  |
Statement [Line Items] |  |  |
Customer life | 30 months |  |

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