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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
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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Face (par) amount of debt instrument at time of issuance.

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