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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Product Information [Line Items]      
REVENUES $ 13,735 $ 13,679  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, net 3,311   $ 3,097
Other noncurrent assets 4,667   4,763
Equipment installment plan receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, net 1,100   967
Other noncurrent assets 977   $ 980
Internet      
Product Information [Line Items]      
REVENUES 5,930 5,826  
Video      
Product Information [Line Items]      
REVENUES 3,580 3,908  
Mobile service      
Product Information [Line Items]      
REVENUES 914 685  
Voice      
Product Information [Line Items]      
REVENUES 356 374  
Residential revenue      
Product Information [Line Items]      
REVENUES 10,780 10,793  
Small business      
Product Information [Line Items]      
REVENUES 1,086 1,088  
Mid-market & large business      
Product Information [Line Items]      
REVENUES 736 708  
Commercial revenue      
Product Information [Line Items]      
REVENUES 1,822 1,796  
Advertising sales      
Product Information [Line Items]      
REVENUES 340 391  
Other      
Product Information [Line Items]      
REVENUES $ 793 $ 699