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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Product Information [Line Items]      
REVENUES $ 13,679 $ 13,653  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, net 3,004   $ 2,965
Other noncurrent assets 4,726   4,732
Equipment installment plan receivable      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, net 695   673
Other noncurrent assets 766   $ 687
Internet      
Product Information [Line Items]      
REVENUES 5,826 5,718  
Video      
Product Information [Line Items]      
REVENUES 3,908 4,254  
Voice      
Product Information [Line Items]      
REVENUES 374 373  
Mobile service      
Product Information [Line Items]      
REVENUES 685 497  
Residential revenue      
Product Information [Line Items]      
REVENUES 10,793 10,842  
Small and medium business      
Product Information [Line Items]      
REVENUES 1,088 1,091  
Enterprise      
Product Information [Line Items]      
REVENUES 708 682  
Commercial revenue      
Product Information [Line Items]      
REVENUES 1,796 1,773  
Advertising sales      
Product Information [Line Items]      
REVENUES 391 355  
Other      
Product Information [Line Items]      
REVENUES $ 699 $ 683