Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator for basic earnings per share:
Income from Continuing Operations	$ 3,826	$ 6,346	$ 13,041	$ 16,246
Net income from continuing operations attributable to noncontrolling interests	(331)	(373)	(829)	(1,107)
Less: Preferred Stock Dividends	(51)	(49)	(155)	(149)
Income from continuing operations attributable to common stock	3,444	5,924	12,057	14,990
Income (loss) from discontinued operations attributable to common stock	0	53	0	(146)
Net Income Attributable to Common Stock	3,444	5,977	12,057	14,844
Dilutive potential common shares:
Numerator for diluted earnings per share	$ 3,444	$ 6,120	$ 12,139	$ 15,276
Denominator for basic earnings per share:
Weighted average number of common shares outstanding (in shares)	7,185	7,153	7,178	7,169
Dilutive potential common shares:
Denominator for diluted earnings per share (in shares)	7,185	7,647	7,280	7,605
AT&T Mobility II, LLC preferred interest conversion
Dilutive potential common shares:
Share-based payment	$ 0	$ 139	$ 72	$ 419
Dilutive potential common shares:
Share-based payment (in shares)	0	446	95	394
Other AT&T units
Dilutive potential common shares:
Share-based payment	$ 0	$ 4	$ 10	$ 13
Dilutive potential common shares:
Share-based payment (in shares)	0	48	7	42