Revenues and Contract Costs - Additional Information (Details)	3 Months Ended
Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments \| segment	2
Revenue from arrangements not accounted for under Topic 606	$ 749,000,000	$ 830,000,000
Amortization of deferred contract costs	795,000,000	749,000,000
Contract assets impairment charge	$ 0	$ 0
Wireless postpaid contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	94.00%	94.00%
Wireline Consumer And Business Markets And SaaS Contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	92.00%	88.00%
Minimum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	1 year
Minimum \| Wireless Service, Option One
Disaggregation of Revenue [Line Items]
Customer contracts service term	1 month
Minimum \| Wireless Service, Option Two
Disaggregation of Revenue [Line Items]
Customer contracts service term	1 month
Minimum \| Consumer
Disaggregation of Revenue [Line Items]
Customer contracts service term	12 months
Minimum \| Consumer \| Reseller Arrangements
Disaggregation of Revenue [Line Items]
Customer contracts service term	2 years
Maximum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	7 years
Maximum \| Wireless Service, Option One
Disaggregation of Revenue [Line Items]
Customer contracts service term	36 months
Maximum \| Wireless Service, Option Two
Disaggregation of Revenue [Line Items]
Customer contracts service term	24 months
Maximum \| Consumer
Disaggregation of Revenue [Line Items]
Customer contracts service term	2 years
Maximum \| Business
Disaggregation of Revenue [Line Items]
Customer contracts service term	12 months

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

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Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131251-203054

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Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer.

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- Definition

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+ References

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599

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- Definition

Amount of revenue that is not accounted for under Topic 606.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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- Definition

Percentage Of Month To Month Contracts Of Total Service Contracts

+ References

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- Definition

Revenue From Contract With Customer, Service Term

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