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Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
6.7% Senior Notes | UScellular
Financial Instruments
Interest rate	6.70%
Book Value | Retail
Financial Instruments
Long-term debt	$ 1,500	$ 1,500
Book Value | Institutional
Financial Instruments
Long-term debt	536	536
Book Value | Other
Financial Instruments
Long-term debt	2,062	1,753
Fair Value | Level 2 | Retail
Financial Instruments
Long-term debt	1,062	899
Fair Value | Level 2 | Institutional
Financial Instruments
Long-term debt	387	395
Fair Value | Level 2 | Other
Financial Instruments
Long-term debt	$ 2,062	$ 1,753
Interest rate | Institutional and Other | Minimum
Financial Instruments
Fair value assumption, interest rate	3.52%	3.52%
Interest rate | Institutional and Other | Maximum
Financial Instruments
Fair value assumption, interest rate	8.55%	8.28%

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
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