v3.26.1
Revenue and Contract Costs - Additional Information (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
segment
Mar. 31, 2025
USD ($)
Disaggregation of Revenue [Line Items]    
Number of reportable segments | segment 2  
Operating Revenues $ 34,440,000,000 $ 33,485,000,000
Revenue recognized related to contract liabilities existing 4,600,000,000 4,600,000,000
Amortization of deferred contract costs 1,000,000,000.0 877,000,000
Contract assets impairment charge $ 0 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period 36 months  
Revenue, remaining performance obligation $ 57,600,000,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2028-10-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period  
Wireless service    
Disaggregation of Revenue [Line Items]    
Operating Revenues $ 20,600,000,000 $ 20,800,000,000
Wireless postpaid contracts    
Disaggregation of Revenue [Line Items]    
Percentage of month-to-month contracts of total service contracts 95.00% 95.00%
Wireline Consumer And Business Markets And Other Contracts    
Disaggregation of Revenue [Line Items]    
Percentage of month-to-month contracts of total service contracts 96.00% 95.00%
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-04-01    
Disaggregation of Revenue [Line Items]    
Revenue, remaining performance obligation, expected timing of satisfaction, period 27 years  
Revenue, remaining performance obligation $ 1,400,000,000  
Business | Fiber Broadband Services    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 12 months  
Minimum    
Disaggregation of Revenue [Line Items]    
Deferred contract cost, amortization period 1 year  
Minimum | Mobility Services    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 1 month  
Minimum | Mobility Services | Wholesale Resellers    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 2 years  
Minimum | Consumer | Fiber Broadband Services    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 12 months  
Maximum    
Disaggregation of Revenue [Line Items]    
Deferred contract cost, amortization period 7 years  
Maximum | Mobility Services    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 36 months  
Maximum | Consumer | Fiber Broadband Services    
Disaggregation of Revenue [Line Items]    
Customer contracts service term 2 years