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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 320,108 $ 307,689
Less Accumulated depreciation 211,798 200,255
Property, plant and equipment, net 108,310 107,434
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment 751 747
Buildings and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 36,940 35,382
Buildings and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 7 years  
Buildings and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 45 years  
Central office and other network equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 170,161 162,001
Central office and other network equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 3 years  
Central office and other network equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 15 years  
Antennas, cable, conduit, poles and towers    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 78,355 75,622
Antennas, cable, conduit, poles and towers | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 4 years  
Antennas, cable, conduit, poles and towers | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 50 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 10,355 10,159
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 5 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 20 years  
Work in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 12,092 12,889
Furniture, vehicles and other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment $ 11,454 $ 10,889
Furniture, vehicles and other | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 3 years  
Furniture, vehicles and other | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment useful life 20 years