v3.4.0.3
Debt - Additional Information (Detail) - USD ($)
 3 Months Ended
Apr. 08, 2016
Apr. 05, 2016
Apr. 04, 2016
Apr. 01, 2016
Mar. 04, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]                
Principal amount outstanding in connection with the guarantee of debt obligations             $ 109,880,000,000 $ 109,729,000,000
Credit Facility                
Debt Instrument [Line Items]                
Borrowing capacity             8,000,000,000  
Amount of unused borrowing capacity under credit facility             7,900,000,000  
Scenario, Forecast                
Debt Instrument [Line Items]                
Expected net pre-tax loss on early debt redemption           $ 1,800,000,000    
Network Equipment | Vendor Financing Facility                
Debt Instrument [Line Items]                
Value of purchase assets financed             100,000,000  
Long-term debt maturing within one year             1,000,000,000  
Guarantee Of Debentures And First Mortgage Bonds Of Operating Telephone Company Subsidiaries                
Debt Instrument [Line Items]                
Principal amount outstanding in connection with the guarantee of debt obligations             3,100,000,000  
Guarantee Of Debentures And First Mortgage Bonds Of Operating Telephone Company Subsidiaries | Subsequent Event                
Debt Instrument [Line Items]                
Principal amount outstanding in connection with the guarantee of debt obligations     $ 1,200,000,000          
Termination of guarantee for aggregate principal amount of debentures       $ 600,000,000        
Guarantee Of Debentures And First Mortgage Bonds Of Operating Telephone Company Subsidiaries | Subsequent Event | Group 2                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount     1,200,000,000          
2016 Tender Offers                
Debt Instrument [Line Items]                
Aggregate purchase price         $ 9,500,000,000      
Tender offer for notes, settlement date         Apr. 04, 2016      
Repayment of debt         $ 10,200,000,000      
Accrued interest paid         100,000,000      
2016 Tender Offers | Maximum                
Debt Instrument [Line Items]                
Aggregate purchase price         $ 5,500,000,000      
2.50% Notes due 2016 | Subsequent Event                
Debt Instrument [Line Items]                
Amount of notes repaid $ 900,000,000              
Stated interest rate on debt instrument 2.50%              
Debt instrument maturity date 2016              
Notes purchased price of principal amount of note, percentage   100.80%            
2.00% Notes due 2016 | Subsequent Event                
Debt Instrument [Line Items]                
Amount of notes repaid $ 500,000,000              
Stated interest rate on debt instrument 2.00%              
Debt instrument maturity date 2016              
Notes purchased price of principal amount of note, percentage   100.80%            
6.35% Notes due 2019 | Subsequent Event                
Debt Instrument [Line Items]                
Amount of notes repaid $ 800,000,000              
Stated interest rate on debt instrument 6.35%              
Debt instrument maturity date 2019              
Notes purchased price of principal amount of note, percentage   113.50%            
April Early Debt Redemption | Subsequent Event                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount $ 2,300,000,000              
Guarantee of Debt Obligations of GTE Corporation                
Debt Instrument [Line Items]                
Principal amount outstanding in connection with the guarantee of debt obligations             $ 1,400,000,000  
Guarantee of Debt Obligations of GTE Corporation | Subsequent Event                
Debt Instrument [Line Items]                
Principal amount outstanding in connection with the guarantee of debt obligations     1,100,000,000          
Guarantee of Debt Obligations of GTE Corporation | Subsequent Event | Group 3                
Debt Instrument [Line Items]                
Extinguishment of Debt, Amount     $ 300,000,000