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Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Product Information [Line Items]          
REVENUES $ 13,672 $ 13,795 $ 41,173 $ 41,159  
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 3,598   3,598   $ 3,097
Other noncurrent assets 5,063   5,063   4,763
Equipment installment plan receivable          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accounts receivable, net 1,200   1,200   967
Other noncurrent assets 1,100   1,100   $ 980
Internet          
Product Information [Line Items]          
REVENUES 5,971 5,872 17,870 17,504  
Mobile service          
Product Information [Line Items]          
REVENUES 954 801 2,789 2,223  
Connectivity          
Product Information [Line Items]          
REVENUES 6,925 6,673 20,659 19,727  
Video          
Product Information [Line Items]          
REVENUES 3,388 3,735 10,452 11,510  
Voice          
Product Information [Line Items]          
REVENUES 332 360 1,034 1,084  
Residential revenue          
Product Information [Line Items]          
REVENUES 10,645 10,768 32,145 32,321  
Small business          
Product Information [Line Items]          
REVENUES 1,086 1,096 3,266 3,285  
Mid-market & large business          
Product Information [Line Items]          
REVENUES 749 723 2,227 2,152  
Commercial revenue          
Product Information [Line Items]          
REVENUES 1,835 1,819 5,493 5,437  
Advertising sales          
Product Information [Line Items]          
REVENUES 356 452 1,067 1,240  
Other          
Product Information [Line Items]          
REVENUES $ 836 $ 756 $ 2,468 $ 2,161