Comprehensive Income (Statements Of Comprehensive Income) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Comprehensive Income
Net income	$ 3,658	$ 4,082	$ 7,126	$ 6,622
Other comprehensive income, net of tax:
Foreign currency translation adjustments (includes $0, $(1), $0 and $(2) attributable to noncontrolling interest), net of taxes of $73, $11, $123 and $62	135	21	228	115
Net unrealized gains (losses) on available-for-sale securities:
Unrealized gains (losses), net of taxes of $19, $(62), $46 and $(14)	6	(115)	55	(25)
Reclassification adjustment realized in net income, net of taxes of $(19), $(16), $(38) and $(29)	(6)	(30)	(41)	(55)
Net unrealized gains (losses) on cash flow hedges:
Unrealized gains (losses) net of taxes of $(12), $(257), $(8) and $(273)	(21)	(472)	(14)	(502)
Reclassification adjustment for losses included in net income, net of taxes of $2, $2, $3 and $4	3	3	5	6
Defined benefit postretirement plans:
Amortization of net prior service cost (benefit) included in net income, net of taxes of $(66), $(61), $(137) and $(122)	(109)	(99)	(224)	(198)
Other	(1)	0	(1)	0
Other comprehensive income (loss)	7	(692)	8	(659)
Total comprehensive income	3,665	3,390	7,134	5,963
Less: Total comprehensive income attributable to noncontrolling interest	(67)	(78)	(127)	(164)
Total Comprehensive Income Attributable to AT&T	3,598	3,312	7,007	5,799
Foreign currency translation adjustments, attributable to noncontrolling interest, net of taxes	0		0	(2)
Foreign currency translation adjustments, tax effect	73	11	123	62
Unrealized gains (losses) on available-for-sale securities (taxes)	2	(62)	29	(14)
Reclassification adjustment realized in net income on available-for-sale securities, tax effect	(2)	(16)	(21)	(29)
Unrealized gains (losses) on cash flow hedges, tax effect	(12)	(257)	(8)
Reclassification adjustment for losses included in net income on cash flow hedges, tax effect	2	2	3	4
Amortization of net prior service cost (benefit) included in net income, tax effect	$ (66)	$ (61)	$ (137)	$ (122)

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