Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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
Numerator for basic earnings per share:
Income (Loss) from Continuing Operations	$ (23,120)	$ 6,346	$ 4,751	$ 5,149	$ 5,202	$ 5,019	$ 5,969	$ 7,586	$ (6,874)	$ 23,776	$ (1,522)
Net income from continuing operations attributable to noncontrolling interests									(1,469)	(1,485)	(1,470)
Less: Preferred Stock Dividends									(203)	(207)	(193)
Income (loss) from continuing operations attributable to common stock	$ (23,536)	$ 5,924	$ 4,319	$ 4,747	$ 4,802	$ 4,613	$ 5,526	$ 7,143	(8,546)	22,084	(3,185)
Adjustment to carrying value of noncontrolling interest									663	0	0
Numerator for basic earnings per share from continuing operations									(7,883)	22,084	(3,185)
Loss from discontinued operations, net of tax									(181)	(2,297)	(2,299)
Loss from discontinued operations attributable to noncontrolling interests									0	87	115
Loss from discontinued operations attributable to common stock									(181)	(2,210)	(2,184)
Numerator for basic earnings per share									(8,064)	19,874	(5,369)
Dilutive potential common shares:
Numerator for diluted earnings per share									$ (7,521)	$ 20,456	$ (4,786)
Denominator for basic earnings per share:
Weighted-average number of common shares outstanding (in shares)									7,166	7,168	7,157
Dilutive potential common shares:
Denominator for diluted earnings per share (in shares)									7,587	7,503	7,466
Basic Earnings Per Share Attributable to Common Stock (in dollars per share)									$ (1.13)	$ 2.77	$ (0.75)
Diluted earnings per share (in dollars per share)									$ (1.13)	$ 2.73	$ (0.75)
AT&T Mobility II, LLC Preferred Interest Conversion [Member]
Dilutive potential common shares:
Dilutive potential common shares									$ 526	$ 560	$ 560
Dilutive potential common shares:
Share-based payment (in shares)									378	304	283
Other AT&T Units [Member]
Dilutive potential common shares:
Dilutive potential common shares									$ 17	$ 22	$ 23
Dilutive potential common shares:
Share-based payment (in shares)									43	31	26