Consolidated Statement Of Changes In Stockholders' Equity (USD $) 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, 2013	$ 91,482	$ 6,495	$ 91,091	$ 31,141	$ (45,619)	$ 7,880	$ 494
Balance at beginning of year (in shares) at Dec. 31, 2013		6,495			(1,269)
Issuance of stock		0
Issuance of stock (in shares)		0
Repurchase of common stock	(1,237)				(1,237)
Repurchase of common stock (in shares)	(37)				(37)
Issuance of treasury stock			4		172
Issuance of treasury stock, (in shares)					5
Share-based payments			(68)
Net income attributable to AT&T ($0.70 per diluted share)	3,652			3,652
Dividends to stockholders ($0.46 per share)				(2,391)
Other comprehensive income (loss) attributable to AT&T	(214)					(214)
Net income attributable to noncontrolling interest	82						82
Distributions							(113)
Translation adjustments attributable to noncontrolling interest, net of taxes	0
Balance at end of period at Mar. 31, 2014	$ 91,369	$ 6,495	$ 91,027	$ 32,402	$ (46,684)	$ 7,666	$ 463
Balance at end of period (in shares) at Mar. 31, 2014		6,495			(1,301)