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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income $ 6,012 $ 6,237 $ 16,505 $ 21,003
Asset impairments and abandonments and restructuring (114) (105) (745) (105)
Interest Expense 1,420 1,627 4,548 5,090
Equity in net income (loss) of affiliates 392 183 1,417 159
Other income (expense) — net 2,270 1,522 6,729 6,958
Income from Continuing Operations Before Income Taxes 7,254 6,315 20,103 23,030
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 7,568 7,038 21,639 21,590
Operating Segments | Communications        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 7,631 7,168 21,886 21,983
Operating Segments | Latin America        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income (63) (130) (247) (393)
Corporate        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income (621) (402) (1,810) (1,033)
Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Transaction and other costs (58) (8) (341) (43)
Amortization of intangibles acquired (16) (28) (60) (142)
Asset impairments and abandonments and restructuring (114) (105) (745) (105)
Benefit-related gains (losses), and other employee-related costs (16) 5 (217) 109
Reclassification of prior service credits (731) (670) (1,961) (2,011)
Video        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income 0 374 0 2,491
Held-for-sale and other reclassifications        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
AT&T Operating Income $ 0 $ 33 $ 0 $ 147