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Summary of Significant Accounting Policies (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue by Product Line      
Revenues $ 51,682,000,000 $ 48,097,000,000 $ 45,764,000,000
Impairment of long-lived assets held-for-use 0 0 0
Impairment of long-lived assets held for sale 36,000,000   42,000,000
Governmental imposed fees passed through to the customer 1,100,000,000 1,100,000,000 1,100,000,000
Customer prepayments - account payable and accrued liabilities 405,000,000 363,000,000  
Upfront installation fees - account payable and accrued liabilities 56,000,000 73,000,000  
Long-term deferred revenue liabilities - other long-term liabilities 29,000,000 35,000,000  
Deferred enterprise commission costs - noncurrent asset 142,000,000 138,000,000  
Deferred upfront MDU fees - noncurrent asset 354,000,000 320,000,000  
Amortization expense of deferred upfront MDU fees 76,000,000 71,000,000 67,000,000
Programming costs $ 11,844,000,000 $ 11,401,000,000 $ 11,290,000,000
Number of reportable segments 1    
Weighted average assumptions used to estimate the fair value of stock options at the date of grant:      
Risk-free interest rate (percentage) 0.70% 1.40% 2.50%
Expected volatility rate (percentage) 27.00% 27.00% 27.00%
Expected life (in years) 5 years 10 months 24 days 5 years 6 months 4 years 10 months 24 days
Minimum | Cable distribution systems      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 6 years    
Minimum | Customer premise equipment and installations      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 3 years    
Minimum | Vehicles and equipment      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 6 years    
Minimum | Buildings and improvements      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 8 years    
Minimum | Furniture, fixtures and equipment      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 2 years    
Maximum | Cable distribution systems      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 22 years    
Maximum | Customer premise equipment and installations      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 8 years    
Maximum | Vehicles and equipment      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 21 years    
Maximum | Buildings and improvements      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 40 years    
Maximum | Furniture, fixtures and equipment      
Property, Plant and Equipment      
Property, plant and equipment, useful life (in years) 10 years    
Internet      
Revenue by Product Line      
Revenues $ 21,094,000,000 $ 18,521,000,000 $ 16,667,000,000
Video      
Revenue by Product Line      
Revenues 17,630,000,000 17,432,000,000 17,607,000,000
Voice      
Revenue by Product Line      
Revenues 1,598,000,000 1,806,000,000 1,920,000,000
Residential revenue      
Revenue by Product Line      
Revenues 40,322,000,000 37,759,000,000 36,194,000,000
Small and medium business      
Revenue by Product Line      
Revenues 4,170,000,000 3,964,000,000 3,868,000,000
Enterprise      
Revenue by Product Line      
Revenues 2,573,000,000 2,468,000,000 2,556,000,000
Commercial revenue      
Revenue by Product Line      
Revenues 6,743,000,000 6,432,000,000 6,424,000,000
Advertising sales      
Revenue by Product Line      
Revenues 1,594,000,000 1,699,000,000 1,568,000,000
Mobile      
Revenue by Product Line      
Revenues 2,178,000,000 1,364,000,000 726,000,000
Other      
Revenue by Product Line      
Revenues $ 845,000,000 $ 843,000,000 $ 852,000,000