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Debt - Credit Facilities, Non-Cash Transaction, Guarantees (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Facility Capacity $ 20,500,000,000   $ 20,500,000,000    
Unused Capacity 9,456,000,000   9,456,000,000    
Principal Amount Outstanding 6,882,000,000   6,882,000,000    
Debt extinguishment gains (losses) 85,000,000 $ 50,000,000 224,000,000 $ (1,100,000,000)  
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    
Network Equipment | Alternative Financing Facility          
Debt Instrument [Line Items]          
Value of purchase assets financed     942,000,000 583,000,000  
Long-term debt maturing within one year 2,100,000,000   2,100,000,000   $ 1,700,000,000
Revolving Credit Facility          
Debt Instrument [Line Items]          
Facility Capacity 9,500,000,000   9,500,000,000    
Unused Capacity 9,456,000,000   9,456,000,000    
Principal Amount Outstanding 0   0    
Amount drawn from credit facilities     0    
Equipment Credit Facilities          
Debt Instrument [Line Items]          
Facility Capacity 11,000,000,000   11,000,000,000    
Unused Capacity 0   0    
Principal Amount Outstanding $ 6,882,000,000   6,882,000,000    
Amount drawn from credit facilities     $ 1,000,000,000 $ 3,000,000,000