v3.26.3
Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Debt Instrument [Line Items]          
Facility Capacity $ 23,950,000,000   $ 23,950,000,000    
Unused Capacity 12,014,000,000   12,014,000,000    
Principal Amount Outstanding 5,394,000,000   5,394,000,000    
Debt extinguishment gains (losses) 138,000,000 $ 94,000,000 385,000,000 $ 272,000,000  
Guarantee of Debentures of Operating Telephone Company Subsidiaries          
Debt Instrument [Line Items]          
Principal amount outstanding in connection with the guarantee of debt obligations 385,000,000   385,000,000    
Alternative Financing Facility | Frontier          
Debt Instrument [Line Items]          
Value of purchase assets financed     428,000,000    
Network Equipment | Alternative Financing Facility          
Debt Instrument [Line Items]          
Value of purchase assets financed     3,100,000,000 1,700,000,000  
Long-term debt maturing within one year 4,400,000,000   4,400,000,000   $ 3,000,000,000.0
Verizon revolving credit facility          
Debt Instrument [Line Items]          
Facility Capacity 12,000,000,000   12,000,000,000    
Unused Capacity 11,929,000,000   11,929,000,000    
Principal Amount Outstanding 0   0    
Amount drawn from credit facilities     0    
Various export credit facilities          
Debt Instrument [Line Items]          
Facility Capacity 11,950,000,000   11,950,000,000    
Unused Capacity 85,000,000   85,000,000    
Principal Amount Outstanding $ 5,394,000,000   5,394,000,000    
Amount drawn from credit facilities     $ 1,600,000,000 $ 0