v3.25.4
Revenue Recognition (Revenue Categories) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 125,648 $ 122,336 $ 122,428
Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 101,158 100,135 99,649
Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 70,099 68,041 65,744
Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 15,978 14,360 12,861
IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 3,542 3,821 4,188
Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 10,362 12,613 15,482
Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,177 1,300 1,374
Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 24,490 22,201 22,779
Operating Segments      
Disaggregation of Revenue [Line Items]      
Total operating revenues 125,275 121,884 121,970
Operating Segments | Communications      
Disaggregation of Revenue [Line Items]      
Total operating revenues 120,896 117,652 118,038
Operating Segments | Communications | Mobility      
Disaggregation of Revenue [Line Items]      
Total operating revenues 89,482 85,255 83,982
Operating Segments | Communications | Mobility | Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 67,384 65,373 63,175
Operating Segments | Communications | Mobility | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 67,384 65,373 63,175
Operating Segments | Communications | Mobility | Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Mobility | IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Mobility | Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Mobility | Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Mobility | Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 22,098 19,882 20,807
Operating Segments | Communications | Business Wireline      
Disaggregation of Revenue [Line Items]      
Total operating revenues 17,231 18,819 20,883
Operating Segments | Communications | Business Wireline | Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 16,503 18,064 20,274
Operating Segments | Communications | Business Wireline | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Business Wireline | Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 7,333 6,969 6,594
Operating Segments | Communications | Business Wireline | IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Business Wireline | Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 9,170 11,095 13,680
Operating Segments | Communications | Business Wireline | Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Business Wireline | Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 728 755 609
Operating Segments | Communications | Consumer Wireline      
Disaggregation of Revenue [Line Items]      
Total operating revenues 14,183 13,578 13,173
Operating Segments | Communications | Consumer Wireline | Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 14,183 13,578 13,173
Operating Segments | Communications | Consumer Wireline | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Communications | Consumer Wireline | Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 8,645 7,391 6,267
Operating Segments | Communications | Consumer Wireline | IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 3,542 3,821 4,188
Operating Segments | Communications | Consumer Wireline | Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,013 1,265 1,508
Operating Segments | Communications | Consumer Wireline | Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 983 1,101 1,210
Operating Segments | Communications | Consumer Wireline | Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Latin America Business Segment      
Disaggregation of Revenue [Line Items]      
Total operating revenues 4,379 4,232 3,932
Operating Segments | Latin America Business Segment | Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 2,715 2,668 2,569
Operating Segments | Latin America Business Segment | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 2,715 2,668 2,569
Operating Segments | Latin America Business Segment | Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Latin America Business Segment | IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Latin America Business Segment | Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Latin America Business Segment | Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Operating Segments | Latin America Business Segment | Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 1,664 1,564 1,363
Corporate      
Disaggregation of Revenue [Line Items]      
Total operating revenues 373 452 458
Corporate | Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 373 452 458
Corporate | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Corporate | Business Service      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Corporate | IP Broadband      
Disaggregation of Revenue [Line Items]      
Total operating revenues 0 0 0
Corporate | Legacy Voice and Data [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 179 253 294
Corporate | Other Service [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues 194 199 164
Corporate | Other Capitalized Property Plant and Equipment [Member]      
Disaggregation of Revenue [Line Items]      
Total operating revenues $ 0 $ 0 $ 0