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Segment Information (Reconciliation Of Operating Income Loss to Consolidated Statement Of Income) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income $ 2,116 $ 5,782 $ 13,723 $ 18,190
Asset impairments and abandonments and restructuring (4,422) (604) (5,061) (604)
Interest expense 1,675 1,662 5,098 4,978
Equity in net income of affiliates 272 420 915 1,338
Other income (expense) — net 717 440 1,850 2,362
Income Before Income Taxes 1,430 4,980 11,390 16,912
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 7,166 7,244 20,925 21,095
Operating Segments | Communications        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 7,156 7,273 20,906 21,193
Operating Segments | Latin America        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 10 (29) 19 (98)
Corporate        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income (654) (725) (2,119) (2,206)
Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Transaction and other costs (34) (72) (101) (72)
Amortization of intangibles acquired (13) (21) (43) (55)
Asset impairments and abandonments and restructuring (4,422) (604) (5,061) (604)
Benefit-related gains (losses) $ 73 $ (40) $ 122 $ 32