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Property, Plant and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment      
Property, plant and equipment, gross $ 68,563 $ 65,996  
Less: accumulated depreciation (34,253) (31,639)  
Property, plant and equipment, net 34,310 34,357  
Depreciation expense 7,700 7,800 $ 7,800
Cable distribution systems      
Property, Plant and Equipment      
Property, plant and equipment, gross 35,907 33,693  
Customer premise equipment and installations      
Property, Plant and Equipment      
Property, plant and equipment, gross 17,893 17,756  
Vehicles and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross 2,019 1,932  
Buildings and improvements      
Property, Plant and Equipment      
Property, plant and equipment, gross 5,729 5,396  
Furniture, fixtures and equipment      
Property, Plant and Equipment      
Property, plant and equipment, gross $ 7,015 $ 7,219