Consolidated Statement Of Changes In Stockholders' Equity - 9 months ended Sep. 30, 2015 - 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, 2014	$ 90,270	$ 6,495	$ 91,108	$ 31,081	$ (47,029)	$ 8,061	$ 554
Balance at beginning of year (in shares) at Dec. 31, 2014		6,495			(1,308)
Issuance of stock		$ 0
Issuance of stock (in shares)		0
Repurchase of common stock					$ (10)
Repurchase of common stock (in shares)					(1)
Issuance of treasury stock			(1,593)		$ 34,730
Issuance of treasury stock, (in shares)					967
Share-based payments			202
Net income attributable to AT&T ($1.71 per diluted share)	9,339			9,339
Dividends to stockholders ($1.41 per share)				(7,793)
Other comprehensive income attributable to AT&T	(2,767)					(2,767)
Net income attributable to noncontrolling interest	262						262
Distributions							(214)
Acquisitions of noncontrolling interests							383
Translation adjustments attributable to noncontrolling interest, net of taxes	(20)						(20)
Balance at end of period at Sep. 30, 2015	$ 122,789	$ 6,495	$ 89,717	$ 32,627	$ (12,309)	$ 5,294	$ 965
Balance at end of period (in shares) at Sep. 30, 2015		6,495			(342)