v3.26.1
Revenue and Contract Costs - Additional Information (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
segment
Jun. 30, 2025
USD ($)
Disaggregation of Revenue [Line Items]        
Number of reportable segments | segment     2  
Operating Revenues $ 34,253,000,000 $ 34,504,000,000 $ 68,693,000,000 $ 67,989,000,000
Revenue recognized related to contract liabilities existing 225,000,000 275,000,000 4,900,000,000 4,900,000,000
Amortization of deferred contract costs 1,000,000,000.0 892,000,000 2,100,000,000 1,800,000,000
Contract assets impairment charge $ 0 0 $ 0 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 36 months   36 months  
Revenue, remaining performance obligation $ 55,200,000,000   $ 55,200,000,000  
Wireless service        
Disaggregation of Revenue [Line Items]        
Operating Revenues $ 20,800,000,000 $ 20,900,000,000 $ 41,400,000,000 $ 41,700,000,000
Wireless postpaid contracts        
Disaggregation of Revenue [Line Items]        
Percentage of month-to-month contracts of total service contracts 95.00% 95.00% 95.00% 95.00%
Wireline Consumer And Small And Medium Business Contracts        
Disaggregation of Revenue [Line Items]        
Percentage of month-to-month contracts of total service contracts 96.00% 94.00% 96.00% 94.00%
Customer Contracts that Have Contract Minimum over Total Contract Term | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-01        
Disaggregation of Revenue [Line Items]        
Revenue, remaining performance obligation, expected timing of satisfaction, period 27 years   27 years  
Revenue, remaining performance obligation $ 1,300,000,000   $ 1,300,000,000  
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   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   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