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Revenues and Contract Costs - Additional Information (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Disaggregation of Revenue [Line Items]    
Number of reportable segments | segment 2  
Revenue from arrangements not accounted for under Topic 606 $ 724,000,000 $ 749,000,000
Revenue recognized related to contract liabilities existing 4,400,000,000 4,300,000,000
Amortization of deferred contract costs 829,000,000 795,000,000
Contract assets impairment charge $ 0 $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period 9 months  
Revenue, remaining performance obligation $ 21,100,000,000  
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  
Revenue, remaining performance obligation $ 23,200,000,000  
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 $ 13,300,000,000  
Wireless postpaid contracts    
Disaggregation of Revenue [Line Items]    
Percentage of month-to-month contracts of total service contracts 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 94.00% 92.00%
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period 29 years  
Revenue, remaining performance obligation $ 2,000,000,000  
Minimum    
Disaggregation of Revenue [Line Items]    
Deferred contract cost, amortization period 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  
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