Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator for basic earnings per share:
Income from Continuing Operations	$ 6,346	$ 5,019	$ 16,246	$ 18,574
Net income from continuing operations attributable to noncontrolling interests	(373)	(356)	(1,107)	(1,137)
Less: Preferred Stock Dividends	(49)	(50)	(149)	(156)
Income from continuing operations attributable to common stock	5,924	4,613	14,990	17,281
Income (loss) from discontinued operations, net of tax	53	1,254	(146)	(2,485)
Net (income) loss from discontinued operations attributable to noncontrolling interests	0	1	0	86
Income (loss) from discontinued operations attributable to common stock	53	1,255	(146)	(2,399)
Net Income Attributable to Common Stock	5,977	5,868	14,844	14,882
Dilutive potential common shares:
Numerator for diluted earnings per share	$ 6,120	$ 6,014	$ 15,276	$ 15,319
Denominator for basic earnings per share:
Weighted average number of common shares outstanding (in shares)	7,153	7,171	7,169	7,167
Dilutive potential common shares:
Denominator for diluted earnings per share (in shares)	7,647	7,506	7,605	7,491
AT&T Mobility II, LLC preferred interest conversion
Dilutive potential common shares:
Share-based payment	$ 139	$ 140	$ 419	$ 420
Dilutive potential common shares:
Share-based payment (in shares)	446	304	394	294
Other AT&T units
Dilutive potential common shares:
Share-based payment	$ 4	$ 6	$ 13	$ 17
Dilutive potential common shares:
Share-based payment (in shares)	48	31	42	30