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Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022
Basis of Presentation [Line Items]
Noncash software license acquisitions		$ 18	$ 135
Expenses related to strategic alternatives review	$ 3	$ 3
TDS | UScellular
Basis of Presentation [Line Items]
Ownership percentage	83.00%	83.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-4

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-Name Accounting Standards Codification
-Topic 230
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-Name Accounting Standards Codification
-Topic 230
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-Section 50
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-URI https://asc.fasb.org//1943274/2147482913/230-10-50-5

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