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Employee Benefits - Pension and Post-Retirement Benefits (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
CenturyLink, Inc. |  |  |
Employee Benefits |  |  |
Allocated expenses by parent entities (as a percent) | 72.00% | 69.00% | 70.00%
Pension Plan |  |  |
Employee Benefits |  |  |
Defined benefit plan, service cost | $ 31,000,000 | $ 38,000,000 | $ 41,000,000
Pension Plan | CenturyLink, Inc. |  |  |
Employee Benefits |  |  |
Employer contributions to benefit plan | 0 | 0 |
Pension Plan | CenturyLink, Inc. |  |  |
Employee Benefits |  |  |
Unfunded status | 615,000,000 | 1,200,000,000 |
Post-Retirement Benefit Plan |  |  |
Employee Benefits |  |  |
Defined benefit plan, service cost | 7,000,000 | 10,000,000 | $ 10,000,000
Post-Retirement Benefit Plan | CenturyLink, Inc. |  |  |
Employee Benefits |  |  |
Unfunded status | $ 2,000,000,000 | 2,800,000,000 |
Pension, Supplemental and Other Postretirement Benefit Plans | Qwest Communications International, Inc. |  |  |
Employee Benefits |  |  |
Pension settlement term | 30 years |  |
Repayments on affiliate obligation | $ 61,000,000 | $ 46,000,000 |

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