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Revenue and Contract Costs - Narrative (Details)	12 Months Ended
Revenue and Contract Costs - Narrative (Details)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments \| segment	2
Revenue from arrangements not accounted for under Topic 606	$ 3,200,000,000	$ 3,100,000,000	$ 2,900,000,000
Contract with customer liability period increase	1,000,000,000	1,600,000,000
Revenue recognized from previously recognized contract liability	(5,000,000,000)	(4,300,000,000)
Amortization of deferred contract costs	3,000,000,000	3,000,000,000
Deferred contract costs, impairment charges	$ 0	$ 0
Wireless postpaid contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	94.00%	93.00%
Wireline Consumer and Small and Medium Business contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	92.00%	86.00%
Minimum \| Wireless Service, Device Payment Plans
Disaggregation of Revenue [Line Items]
Contract term	1 month
Minimum \| Wireless Service, Fixed Term Plans
Disaggregation of Revenue [Line Items]
Contract term	1 month
Minimum \| Consumer
Disaggregation of Revenue [Line Items]
Contract term	12 months
Minimum \| Consumer \| Reseller Arrangements
Disaggregation of Revenue [Line Items]
Contract term	2 years
Maximum \| Wireless Service, Device Payment Plans
Disaggregation of Revenue [Line Items]
Contract term	36 months
Maximum \| Wireless Service, Fixed Term Plans
Disaggregation of Revenue [Line Items]
Contract term	24 months
Maximum \| Consumer
Disaggregation of Revenue [Line Items]
Contract term	2 years
Maximum \| Business
Disaggregation of Revenue [Line Items]
Contract term	12 months