Consolidated Statement Of Changes In Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Preferred Stock Preferred Stock - Series A	Preferred Stock Preferred Stock - Series B	Preferred Stock Preferred Stock - Series C	Common Stock	Additional Paid-In Capital	Retained (Deficit) Earnings	Treasury Stock	Accumulated Other Comprehensive Income Attributable to AT&T, net of tax	Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2021	$ 183,855	$ 0	$ 0	$ 0	$ 7,621	$ 130,112	$ 42,350	$ (17,280)	$ 3,529	$ 17,523
Balance at beginning of period (in shares) at Dec. 31, 2021		0	0	0	7,621			(480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and acquisition of common stock								$ (197)
Repurchase and acquisition of common stock (in shares)								(8)
Issuance/reissuance of treasury stock						(126)		$ (924)
Issuance/reissuance of treasury stock (in shares)								26
Share-based payments						(349)
Net income attributable to AT&T	4,810						4,810
Preferred stock dividends						0	(99)
Dividends, Common Stock, Cash						0	(2,020)
Other comprehensive income attributable to AT&T	(239)								(239)
Net income attributable to noncontrolling interest	354									354
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										(16)
Distributions										(341)
Balance at end of period at Mar. 31, 2022	186,556	$ 0	$ 0	$ 0	$ 7,621	129,637	45,041	$ (16,553)	3,290	17,520
Balance at end of period (in shares) at Mar. 31, 2022		0	0	0	7,621			(462)
Balance at beginning of period at Dec. 31, 2022	106,457	$ 0	$ 0	$ 0	$ 7,621	123,610	(19,415)	$ (17,082)	2,766	8,957
Balance at beginning of period (in shares) at Dec. 31, 2022		0	0	0	7,621			(493)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase and acquisition of common stock								$ (188)
Repurchase and acquisition of common stock (in shares)								(10)
Issuance/reissuance of treasury stock						(365)		$ (1,104)
Issuance/reissuance of treasury stock (in shares)								31
Share-based payments						(371)
Net income attributable to AT&T	4,228						4,228
Preferred stock dividends						(98)	0
Dividends, Common Stock, Cash						(2,002)	0
Other comprehensive income attributable to AT&T	(412)								(412)
Net income attributable to noncontrolling interest	225									225
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										0
Distributions										(232)
Balance at end of period at Mar. 31, 2023	$ 108,346	$ 0	$ 0	$ 0	$ 7,621	$ 120,774	$ (15,187)	$ (16,166)	$ 2,354	$ 8,950
Balance at end of period (in shares) at Mar. 31, 2023		0	0	0	7,621			(472)