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Revenues - Disaggregation of Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disaggregation of Revenue [Line Items]      
REVENUES $ 55,085 $ 54,607 $ 54,022
Revenue from Contract with Customer, Including Assessed Tax 941 993 1,100
Internet      
Disaggregation of Revenue [Line Items]      
REVENUES 23,360 23,032 22,222
Video      
Disaggregation of Revenue [Line Items]      
REVENUES 15,126 16,351 17,460
Voice      
Disaggregation of Revenue [Line Items]      
REVENUES 1,437 1,510 1,559
Mobile service      
Disaggregation of Revenue [Line Items]      
REVENUES 3,083 2,243 1,698
Residential revenue      
Disaggregation of Revenue [Line Items]      
REVENUES 43,006 43,136 42,939
Small and medium business      
Disaggregation of Revenue [Line Items]      
REVENUES 4,371 4,353 4,350
Enterprise      
Disaggregation of Revenue [Line Items]      
REVENUES 2,883 2,770 2,677
Commercial revenue      
Disaggregation of Revenue [Line Items]      
REVENUES 7,254 7,123 7,027
Advertising sales      
Disaggregation of Revenue [Line Items]      
REVENUES 1,780 1,551 1,882
Other      
Disaggregation of Revenue [Line Items]      
REVENUES $ 3,045 $ 2,797 $ 2,174