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Revenues and Contract Costs - Additional Information (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Disaggregation of Revenue [Line Items]        
Number of reportable segments | segment     2  
Revenue from arrangements not accounted for under Topic 606 $ 809,000,000 $ 693,000,000 $ 2,300,000,000 $ 2,200,000,000
Revenue recognized related to contract liabilities existing 206,000,000 202,000,000 4,900,000,000 4,800,000,000
Amortization of deferred contract costs 865,000,000 799,000,000 2,500,000,000 2,400,000,000
Contract assets impairment charge $ 0 $ 0 $ 0 $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 3 months   3 months  
Revenue, remaining performance obligation $ 7,700,000,000   $ 7,700,000,000  
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 $ 27,100,000,000   $ 27,100,000,000  
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 $ 23,100,000,000   $ 23,100,000,000  
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]: 2024-10-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 29 years   29 years  
Revenue, remaining performance obligation $ 1,800,000,000   $ 1,800,000,000  
Minimum        
Disaggregation of Revenue [Line Items]        
Deferred contract cost, amortization period 2 years   2 years  
Minimum | Wireless Service, Device Payment Plan and Fixed-Term Plan        
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, Device Payment Plan and Fixed-Term Plan        
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