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Debt - Narrative (Details) - USD ($) $ in Millions | Oct. 14, 2021 | Sep. 01, 2021 | Jun. 16, 2021 | May 17, 2021 | May 12, 2021
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Debt Instrument [Line Items] |  |  |  |  |
Unamortized debt issuance costs |  | $ 14 |  |  | $ 26
Redemption price rate |  | 100.00% |  |  | 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 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount redeemed |  | $ 116 |  |  |
Interest rate |  | 6.625% |  |  |
6.95% Senior Notes | UScellular |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount redeemed |  | $ 342 |  |  |
Interest rate |  | 6.95% |  |  |
5.875% Senior Notes | Subsequent event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount redeemed | $ 195 |  |  |  |
Interest rate | 5.875% |  |  |  |
Unamortized debt issuance costs | $ 7 |  |  |  |
Redemption price rate | 100.00% |  |  |  |

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