Consolidated Statement Of Changes In Stockholders' Equity - 6 months ended Jun. 30, 2016 - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income Attributable to AT&T, net of tax [Member]	Noncontrolling Interest [Member]
Balance at beginning of year at Dec. 31, 2015	$ 123,640	$ 6,495	$ 89,763	$ 33,671	$ (12,592)	$ 5,334	$ 969
Balance at beginning of year (in shares) at Dec. 31, 2015		6,495			(350)
Issuance of stock		$ 0
Issuance of stock (in shares)		0
Repurchase and acquisition of common stock					$ (294)
Repurchase and acquisition of common stock (in shares)					(7)
Issuance of treasury stock			(43)		$ 543
Issuance of treasury stock, (in shares)					14
Share-based payments			(258)
Change related to acquisition of interests held by noncontrolling owners			24
Net income attributable to AT&T ($1.17 per diluted share)	7,211			7,211
Dividends to stockholders ($0.96 per share)				(5,932)
Other comprehensive income attributable to AT&T	(520)					(520)
Net income attributable to noncontrolling interest	189						189
Distributions							(164)
Acquisition of interests held by noncontrolling owners							(25)
Balance at end of period at Jun. 30, 2016	$ 124,371	$ 6,495	$ 89,486	$ 34,950	$ (12,343)	$ 4,814	$ 969
Balance at end of period (in shares) at Jun. 30, 2016		6,495			(343)