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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Product Information [Line Items]          
REVENUES $ 13,584 $ 13,550 $ 40,896 $ 40,348  
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 2,932   2,932   $ 2,921
Other noncurrent assets 4,898   4,898   4,769
Equipment installment plan receivable          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 651   651   577
Other noncurrent assets 547   547   $ 261
Internet          
Product Information [Line Items]          
REVENUES 5,776 5,571 17,227 16,585  
Video          
Product Information [Line Items]          
REVENUES 4,004 4,379 12,446 13,209  
Voice          
Product Information [Line Items]          
REVENUES 379 391 1,117 1,180  
Mobile service          
Product Information [Line Items]          
REVENUES 581 435 1,617 1,237  
Residential revenue          
Product Information [Line Items]          
REVENUES 10,740 10,776 32,407 32,211  
Small and medium business          
Product Information [Line Items]          
REVENUES 1,085 1,095 3,270 3,257  
Enterprise          
Product Information [Line Items]          
REVENUES 698 673 2,070 2,003  
Commercial revenue          
Product Information [Line Items]          
REVENUES 1,783 1,768 5,340 5,260  
Advertising sales          
Product Information [Line Items]          
REVENUES 384 481 1,123 1,324  
Other          
Product Information [Line Items]          
REVENUES $ 677 $ 525 $ 2,026 $ 1,553