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Divestitures - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 17, 2024 USD ($)	Sep. 30, 2024 USD ($) asset_group	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) asset_group	Sep. 30, 2023 USD ($)	Aug. 19, 2024 USD ($)	May 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Licenses		$ 4,586		$ 4,586				$ 4,702
Expenses related to strategic alternatives review		11	$ 4	43	$ 4
(Gain) loss on sale of business and other exit costs, net		12	$ 0	12	0
Cash received from divestitures				91	$ 0
Wireless spectrum licenses
Licenses		586		586
Subsequent event
License sale agreement amount	$ 1,000
UScellular Total
Business divestiture agreement amount		$ 4,400		$ 4,400
Asset groups | asset_group		2		2
UScellular Total | Maximum
Amount of debt assumed under a business divestiture agreement		$ 2,000		$ 2,000
UScellular Total | Put/Call Agreement
Business divestiture agreement amount		106		106
Put/call amount, fair value		6		6
TDS Telecom
Business divestiture agreement amount						$ 26	$ 31
Corporate, Eliminations and Other
Business divestiture agreement amount		101		101
Contingent proceeds		$ 9		9
(Gain) loss on sale of business and other exit costs, net				12
Cash received from divestitures				$ 91

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Amount of Business divestiture agreement.

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Amount of debt assumed under a business divestiture agreement.

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For contingent consideration arrangements recognized in connection with a business divestiture, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Divestiture of Intangible Assets Agreement Amount

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Expenses related to the company's strategic alternative review of UScellular.

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Fair value of the net written call option.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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