v3.26.1
Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Debt Instrument [Line Items]      
Facility Capacity $ 23,950,000,000    
Unused Capacity 12,061,000,000    
Principal Amount Outstanding 5,924,000,000    
Debt extinguishment gains (losses) 95,000,000 $ 90,000,000  
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    
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 1,100,000,000 627,000,000  
Long-term debt maturing within one year 3,800,000,000   $ 3,000,000,000.0
Verizon revolving credit facility      
Debt Instrument [Line Items]      
Facility Capacity 12,000,000,000    
Unused Capacity 11,976,000,000    
Principal Amount Outstanding 0    
Amount drawn from credit facilities 0    
Various export credit facilities      
Debt Instrument [Line Items]      
Facility Capacity 11,950,000,000    
Unused Capacity 85,000,000    
Principal Amount Outstanding 5,924,000,000    
Amount drawn from credit facilities $ 1,600,000,000 $ 0