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Revenues and Contract Costs - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments | segment			2
Revenue from arrangements not accounted for under Topic 606	$ 693	$ 774	$ 2,200	$ 2,400
Amortization of deferred contract costs	$ 799	$ 735	$ 2,400	$ 2,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	3 months		3 months
Revenue, remaining performance obligation	$ 6,500		$ 6,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year		1 year
Revenue, remaining performance obligation	$ 22,100		$ 22,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation	$ 19,700		$ 19,700
Wireless postpaid contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	94.00%	94.00%	94.00%	94.00%
Wireline Consumer And Business Markets And Other Contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	94.00%	90.00%	94.00%	90.00%
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	16 years		16 years
Revenue, remaining performance obligation	$ 1,400		$ 1,400
Minimum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	1 year		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		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

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