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Revenue Recognition (Revenue Categories) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 30,213 $ 30,350 $ 90,038 $ 90,406
Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 25,134 25,112 74,982 74,579
Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 17,184 16,580 50,844 49,034
Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,417 5,087 13,688 15,401
Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,838 2,667 8,301 7,755
Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 373 437 1,162 1,379
Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 322 341 987 1,010
Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 5,079 5,238 15,056 15,827
Operating Segments        
Disaggregation of Revenue [Line Items]        
Total operating revenues 30,096 30,236 89,701 90,083
Operating Segments | Communications        
Disaggregation of Revenue [Line Items]        
Total operating revenues 29,074 29,244 86,513 87,241
Operating Segments | Communications | Mobility        
Disaggregation of Revenue [Line Items]        
Total operating revenues 21,052 20,692 62,126 61,589
Operating Segments | Communications | Mobility | Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 16,539 15,908 48,810 47,136
Operating Segments | Communications | Mobility | Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 16,539 15,908 48,810 47,136
Operating Segments | Communications | Mobility | Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Mobility | Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Mobility | Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Mobility | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Mobility | Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,513 4,784 13,316 14,453
Operating Segments | Communications | Business Wireline        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,606 5,221 14,274 15,831
Operating Segments | Communications | Business Wireline | Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,417 5,087 13,688 15,401
Operating Segments | Communications | Business Wireline | Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Business Wireline | Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 4,417 5,087 13,688 15,401
Operating Segments | Communications | Business Wireline | Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Business Wireline | Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Business Wireline | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Business Wireline | Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 189 134 586 430
Operating Segments | Communications | Consumer Wireline        
Disaggregation of Revenue [Line Items]        
Total operating revenues 3,416 3,331 10,113 9,821
Operating Segments | Communications | Consumer Wireline | Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 3,416 3,331 10,113 9,821
Operating Segments | Communications | Consumer Wireline | Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Consumer Wireline | Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Communications | Consumer Wireline | Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 2,838 2,667 8,301 7,755
Operating Segments | Communications | Consumer Wireline | Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 307 368 972 1,147
Operating Segments | Communications | Consumer Wireline | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 271 296 840 919
Operating Segments | Communications | Consumer Wireline | Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Latin America        
Disaggregation of Revenue [Line Items]        
Total operating revenues 1,022 992 3,188 2,842
Operating Segments | Latin America | Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 645 672 2,034 1,898
Operating Segments | Latin America | Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 645 672 2,034 1,898
Operating Segments | Latin America | Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Latin America | Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Latin America | Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Latin America | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Operating Segments | Latin America | Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues 377 320 1,154 944
Corporate        
Disaggregation of Revenue [Line Items]        
Total operating revenues 117 114 337 323
Corporate | Total Service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 117 114 337 323
Corporate | Wireless service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Corporate | Business service        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Corporate | Broadband        
Disaggregation of Revenue [Line Items]        
Total operating revenues 0 0 0 0
Corporate | Legacy voice and data        
Disaggregation of Revenue [Line Items]        
Total operating revenues 66 69 190 232
Corporate | Other        
Disaggregation of Revenue [Line Items]        
Total operating revenues 51 45 147 91
Corporate | Equipment        
Disaggregation of Revenue [Line Items]        
Total operating revenues $ 0 $ 0 $ 0 $ 0