Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Income (Loss) Attributable to Parent [Abstract]
Net income (loss)	$ (7,055)	$ 21,479	$ (3,821)
Foreign Currency:
Translation adjustment (includes $0, $(2) and $(59) attributable to noncontrolling interest), net of taxes of $90, $(44) and $(42)	346	(127)	(929)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		2,087	0
Securities:
Net unrealized gains (losses), net of taxes of $(49), $(21) and $27	(143)	(63)	78
Reclassification adjustment included in net income (loss), net of taxes of $3, $(1) and $(5)	8	(3)	(15)
Derivative Instruments:
Net unrealized gains (losses), net of taxes of $(183), $(192) and $(212)	(648)	(715)	(811)
Reclassification adjustment included in net income (loss), net of taxes of $25, $19 and $18	96	72	69
Defined benefit postretirement plans:
Net prior service (cost) credit arising during period, net of taxes of $583, $(8) and $735	1,787	(34)	2,250
Amortization of net prior service credit included in net income (loss), net of taxes of $(663), $(660) and $(601)	(2,028)	(2,020)	(1,841)
Other comprehensive income (loss)	(763)	(803)	(1,199)
Total comprehensive income (loss)	(7,818)	20,676	(5,020)
Less: Total comprehensive income attributable to noncontrolling interest	(1,469)	(1,396)	(1,296)
Total Comprehensive Income (Loss) Attributable to AT&T	(9,287)	19,280	(6,316)
WarnerMedia
Foreign Currency:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(182)	0	0
Derivative Instruments:
Distributions of WarnerMedia, net of taxes of $(12), $0 and $0	(24)	0	0
Defined benefit postretirement plans:
Distributions of WarnerMedia, net of taxes of $5, $0 and $0	$ 25	$ 0	$ 0