v3.25.4
Revenue and Contract Costs - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Disaggregation of Revenue [Line Items]    
Number of reportable segments | segment 2  
Contract with customer asset period decrease $ 165,000,000  
Contract with customer liability period increase 331,000,000  
Revenue recognized from previously recognized contract liability 5,200,000,000 $ 5,000,000,000.0
Amortization of deferred contract costs 3,600,000,000 3,400,000,000
Deferred contract costs, impairment charges $ 0 $ 0
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 36 months  
Revenue, remaining performance obligation $ 58,100,000,000  
Minimum    
Disaggregation of Revenue [Line Items]    
Deferred contract cost, amortization period 1 year  
Minimum | Consumer    
Disaggregation of Revenue [Line Items]    
Contract term 12 months  
Maximum    
Disaggregation of Revenue [Line Items]    
Deferred contract cost, amortization period 7 years  
Maximum | Consumer    
Disaggregation of Revenue [Line Items]    
Contract term 2 years  
Maximum | Business    
Disaggregation of Revenue [Line Items]    
Contract term 12 months  
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 94.00% 95.00%
Wireless Service, Device Payment Plans | Minimum    
Disaggregation of Revenue [Line Items]    
Contract term 1 month  
Wireless Service, Device Payment Plans | Maximum    
Disaggregation of Revenue [Line Items]    
Contract term 36 months  
Reseller Arrangements | Minimum | Consumer    
Disaggregation of Revenue [Line Items]    
Contract term 2 years  
Customer Contracts that Have Contract Minimum over Total Contract Term | 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 28 years  
Revenue, remaining performance obligation $ 1,300,000,000