Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 3,078	$ 3,187	$ 9,601	$ 10,654
Foreign currency:
Translation adjustment (includes $(20), $(1), $(20) and $0 attributable to noncontrolling interest), net of taxes of $(535), $(22), $(638) and $(17)	(1,039)	(35)	(1,224)	(29)
Reclassification adjustment included in net income, net of taxes of $0, $0, $0 and $224	0	0	0	416
Available-for-sale securities:
Net unrealized gains (losses), net of taxes of $(49), $(15), $(30) and $19	(85)	(29)	(51)	30
Reclassification adjustment included in net income, net of taxes of $2, $(1), $(3) and $(9)	3	(1)	(6)	(15)
Cash flow hedges:
Net unrealized gains (losses), net of taxes of $(237), $201, $(479) and $148	(441)	370	(890)	272
Reclassification adjustment included in net income, net of taxes of $6, $3, $15 and $14	11	8	28	29
Defined benefit postretirement plans:
Amortization of net prior service credit included in net income, net of taxes of $(131), $(146), $(393) and $(435)	(215)	(239)	(644)	(718)
Reclassification adjustment included in net income, net of taxes $0, $0, $0 and $33	0	0	0	61
Other comprehensive income (loss)	(1,766)	74	(2,787)	46
Total comprehensive income	1,312	3,261	6,814	10,700
Less: Total comprehensive income attributable to noncontrolling interest	(64)	(56)	(242)	(213)
Total Comprehensive Income Attributable to AT&T	$ 1,248	$ 3,205	$ 6,572	$ 10,487