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Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]            
Facility Capacity $ 22,000,000,000   $ 22,000,000,000      
Unused Capacity 11,977,000,000   11,977,000,000      
Principal Amount Outstanding 4,588,000,000   4,588,000,000      
Debt extinguishment gains (losses) 94,000,000 $ 90,000,000 272,000,000 $ 289,000,000    
Pension            
Debt Instrument [Line Items]            
Employer discretionary contribution amount 563,000,000   563,000,000 365,000,000    
Guarantee of Debentures of Operating Telephone Company Subsidiaries            
Debt Instrument [Line Items]            
Principal amount outstanding in connection with the guarantee of debt obligations 614,000,000   614,000,000      
Verizon 5.250% Notes Due 2035            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 2,300,000,000   $ 2,300,000,000   $ 2,250,000,000  
Debt instrument, interest rate, stated percentage 5.25%   5.25%   5.25%  
Network Equipment | Alternative Financing Facility            
Debt Instrument [Line Items]            
Value of purchase assets financed     $ 1,700,000,000 1,200,000,000    
Long-term debt maturing within one year $ 2,900,000,000   2,900,000,000     $ 2,500,000,000
Verizon revolving credit facility            
Debt Instrument [Line Items]            
Facility Capacity 12,000,000,000   12,000,000,000      
Unused Capacity 11,977,000,000   11,977,000,000      
Principal Amount Outstanding 0   0      
Amount drawn from credit facilities     0      
Various export credit facilities            
Debt Instrument [Line Items]            
Facility Capacity 10,000,000,000   10,000,000,000      
Unused Capacity 0   0      
Principal Amount Outstanding $ 4,588,000,000   4,588,000,000      
Amount drawn from credit facilities     $ 0 $ 0