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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Product Information [Line Items]          
REVENUES $ 13,795 $ 13,584 $ 41,159 $ 40,896  
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 3,067   3,067   $ 2,965
Other noncurrent assets 4,762   4,762   4,732
Equipment installment plan receivable          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 864   864   673
Other noncurrent assets 910   910   $ 687
Internet          
Product Information [Line Items]          
REVENUES 5,872 5,776 17,504 17,227  
Video          
Product Information [Line Items]          
REVENUES 3,735 4,004 11,510 12,446  
Voice          
Product Information [Line Items]          
REVENUES 360 379 1,084 1,117  
Mobile service          
Product Information [Line Items]          
REVENUES 801 581 2,223 1,617  
Residential revenue          
Product Information [Line Items]          
REVENUES 10,768 10,740 32,321 32,407  
Small and medium business          
Product Information [Line Items]          
REVENUES 1,096 1,085 3,285 3,270  
Enterprise          
Product Information [Line Items]          
REVENUES 723 698 2,152 2,070  
Commercial revenue          
Product Information [Line Items]          
REVENUES 1,819 1,783 5,437 5,340  
Advertising sales          
Product Information [Line Items]          
REVENUES 452 384 1,240 1,123  
Other          
Product Information [Line Items]          
REVENUES $ 756 $ 677 $ 2,161 $ 2,026