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Revenues and Contract Costs - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)
Disaggregation of Revenue [Line Items]
Number of reportable segments \| segment			2
Revenue from arrangements not accounted for under Topic 606	$ 753,000,000	$ 754,000,000	$ 1,500,000,000	$ 1,500,000,000
Revenue recognized related to contract liabilities existing	262,000,000	258,000,000	4,700,000,000	4,600,000,000
Amortization of deferred contract costs	829,000,000	791,000,000	1,700,000,000	1,600,000,000
Contract assets impairment charge	$ 0	$ 0	$ 0	$ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months		6 months
Revenue, remaining performance obligation	$ 14,800,000,000		$ 14,800,000,000
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	1 year		1 year
Revenue, remaining performance obligation	$ 24,500,000,000		$ 24,500,000,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period
Revenue, remaining performance obligation	$ 17,000,000,000		$ 17,000,000,000
Wireless postpaid contracts
Disaggregation of Revenue [Line Items]
Percentage of month-to-month contracts of total service contracts	95.00%	94.00%	95.00%	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	95.00%	94.00%	95.00%	94.00%
Customer Contracts that Have Contract Minimum over Total Contract Term \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period	29 years		29 years
Revenue, remaining performance obligation	$ 2,000,000,000.0		$ 2,000,000,000.0
Minimum
Disaggregation of Revenue [Line Items]
Deferred contract cost, amortization period	2 years		2 years
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			36 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