Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 6,399	$ 6,273	$ 16,100	$ 16,089
Foreign currency:
Translation adjustment (includes $0, $(4), $0 and $(2) attributable to noncontrolling interest), net of taxes of $(38), $(17), $25 and $(13)	(88)	(86)	160	106
Distribution of WarnerMedia, net of taxes of $0, $0, $(38) and $0	(12)	0	(182)	0
Securities:
Net unrealized gains (losses), net of taxes of $(15), $(1), $(52) and $(13)	(43)	(4)	(152)	(39)
Reclassification adjustment included in net income, net of taxes of $1, $0, $3 and $(1)	1	(1)	7	(4)
Derivative instruments:
Net unrealized gains (losses), net of taxes of $(143), $(54) $(246) and $(160)	(540)	(195)	(885)	(593)
Reclassification adjustment included in net income, net of taxes of $3, $4, $22 and $16	12	11	85	57
Distribution of WarnerMedia, net of taxes of $0, $0, $(12) and $0	0	0	(24)	0
Defined benefit postretirement plans:
Net prior service credit arising during the period, net of taxes of $583, $0, $583 and $0	1,787	0	1,787	0
Amortization of net prior service credit included in net income, net of taxes of $(180), $(165), $(484) and $(495)	(551)	(505)	(1,477)	(1,516)
Distribution of WarnerMedia, net of taxes of $0, $0, $5 and $0	0	0	25	0
Other comprehensive income (loss)	566	(780)	(656)	(1,989)
Total comprehensive income	6,965	5,493	15,444	14,100
Less: Total comprehensive income attributable to noncontrolling interest	(373)	(351)	(1,107)	(1,049)
Total Comprehensive Income Attributable to AT&T	$ 6,592	$ 5,142	$ 14,337	$ 13,051