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Debt - Narrative (Details) - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Sep. 01, 2021 | Jun. 30, 2021
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs |  | $ 26
Redemption price rate |  | 100.00%
Subsequent event |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 14 |
Redemption price rate | 100.00% |
6.875% Senior Notes |  |
Debt Instrument [Line Items] |  |
Amount redeemed |  | $ 225
Interest rate |  | 6.875%
7.0% Senior Notes |  |
Debt Instrument [Line Items] |  |
Amount redeemed |  | $ 300
Interest rate |  | 7.00%
7.25% 2063 Senior Notes | UScellular |  |
Debt Instrument [Line Items] |  |
Amount redeemed |  | $ 275
Interest rate |  | 7.25%
5.5% 2070 Senior Notes | UScellular |  |
Debt Instrument [Line Items] |  |
Interest rate |  | 5.50%
Redemption price rate |  | 100.00%
Principal amount |  | $ 500
Long-term debt |  | 484
Debt issuance costs |  | 16
7.25% 2064 Senior Notes | UScellular |  |
Debt Instrument [Line Items] |  |
Amount redeemed |  | $ 300
Interest rate |  | 7.25%
Unamortized debt issuance costs |  | $ 10
Redemption price rate |  | 100.00%
6.625% Senior Notes | Subsequent event |  |
Debt Instrument [Line Items] |  |
Amount redeemed | $ 116 |
Interest rate | 6.625% |
6.95% Senior Notes | UScellular | Subsequent event |  |
Debt Instrument [Line Items] |  |
Amount redeemed | $ 342 |
Interest rate | 6.95% |

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