Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share
Net income	$ 3,621	$ 3,880	$ 7,355	$ 7,653
Less: Net income attributable to noncontrolling interest	(74)	(58)	(156)	(131)
Net income attributable to AT&T	3,547	3,822	7,199	7,522
Share-based payment	3	2	7	6
Numerator for diluted earnings per share	$ 3,550	$ 3,824	$ 7,206	$ 7,528
Weighted-average number of common shares outstanding	5,204	5,381	5,213	5,446
Share-based payment (in shares)	16	16	16	17
Denominator for diluted earnings per share	5,220	5,397	5,229	5,463
Basic Earnings Per Share Attributable to AT&T	$ 0.68	$ 0.71	$ 1.38	$ 1.38
Diluted Earnings Per Share Attributable to AT&T	$ 0.68	$ 0.71	$ 1.38	$ 1.38
Stock options issued and outstanding	11	13	11	13
Stock options with exercise prices above average market price of company stock	3	2