Segment Information (Reconciliation Of Operating Income (Loss) to Consolidated Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations Before Income Taxes									$ (3,094)	$ 29,171	$ (354)
AT&T Operating Income (Loss)	$ (21,092)	$ 6,012	$ 4,956	$ 5,537	$ 4,894	$ 6,237	$ 7,572	$ 7,194	(4,587)	25,897	8,372
Asset impairments and abandonments and restructuring									(27,498)	(213)	(15,687)
Interest Expense									6,108	6,716	7,727
Equity in net income of affiliates									1,791	603	89
Other income (expense) – net									5,810	9,387	(1,088)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations Before Income Taxes									28,781	27,883	28,475
AT&T Operating Income (Loss)									28,781	27,883	28,475
Operating Segments | Communications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations Before Income Taxes									29,107	28,393	29,062
AT&T Operating Income (Loss)									29,107	28,393	29,062
Operating Segments | Latin America Business Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income (Loss) from Continuing Operations Before Income Taxes									(326)	(510)	(587)
AT&T Operating Income (Loss)									(326)	(510)	(587)
Corporate
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
AT&T Operating Income (Loss)									(2,570)	(1,644)	(1,398)
Video
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
AT&T Operating Income (Loss)									0	2,491	2,174
Held-for-sale and other reclassifications
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
AT&T Operating Income (Loss)									0	143	681
Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Transaction and other costs									(425)	(41)	(1,064)
Amortization of intangibles acquired									(76)	(170)	(3,427)
Asset impairments and abandonments and restructuring									(27,498)	(213)	(15,687)
Gain on spectrum transaction									0	0	900
Benefit-related gains (losses)									(108)	128	160
Reclassification of prior service credits									$ (2,691)	$ (2,680)	$ (2,442)