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Debt - Receivables Securitization Agreement (Details) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jul. 21, 2021 | Jul. 20, 2021 | Mar. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Repayment of long-term debt | $ 1,301 | $ 5 |  |  |
Subsequent event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio |  |  |  | 3.75 |
UScellular | Receivables securitization agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount borrowed | 100 |  |  |  | $ 275
Repayment of long-term debt | 200 |  |  |  |
Maximum borrowing capacity | 450 |  |  |  |
Amount available for use | 350 |  |  |  |
Assets pledged as collateral | $ 382 |  |  |  |
UScellular | Receivables securitization agreement | Subsequent event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Consolidated leverage ratio |  |  | 3.75 |  |

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