Acquisitions, Dispositions And Other Adjustments (Pro-Forma Consolidated Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition Pro Forma Information [Line Items]
Total operating revenues	$ 41,230	$ 41,301	$ 123,346	$ 122,263
Net Income Attributable to AT&T	$ 2,985	$ 3,429	$ 9,210	$ 11,065
Basic Earnings Per Share Attributable to AT&T	$ 0.50	$ 0.56	$ 1.69	$ 1.80
Diluted Earnings Per Share Attributable to AT&T	$ 0.50	$ 0.55	$ 1.69	$ 1.79