Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share

Reconciliation Of The Numerators And Denominators Of Basic Earnings Per Share And Diluted Earnings Per Share [Table Text Block]

Year Ended December 31,	2017		2016		2015
Numerators
Numerator for basic earnings per share:
Net income	$	29,847	$	13,333	$	13,687
Less: Net income attributable to noncontrolling interest		(397)		(357)		(342)
Net income attributable to AT&T		29,450		12,976		13,345
Dilutive potential common shares:
Share-based payment		13		13		13
Numerator for diluted earnings per share	$	29,463	$	12,989	$	13,358
Denominators (000,000)
Denominator for basic earnings per share:
Weighted-average number of common shares outstanding		6,164		6,168		5,628
Dilutive potential common shares:
Share-based payment (in shares)		19		21		18
Denominator for diluted earnings per share		6,183		6,189		5,646
Basic earnings per share attributable to AT&T	$	4.77	$	2.10	$	2.37
Diluted earnings per share attributable to AT&T	$	4.76	$	2.10	$	2.37