Segment Information (Summary Of Operating Revenues And Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Revenue	$ 39,091	$ 32,957	$ 104,682	$ 98,008
Operations and Support Expenses	26,903	22,811	71,890	66,621
EBITDA	12,188	10,146	32,792	31,387
Depreciation and Amortization	6,265	4,539	15,539	13,706
Operating Income (Loss)	5,923	5,607	17,253	17,681
Equity in Net Income (Loss) of Affiliates	15	(2)	48	188
Segment Contribution	4,735	4,631	14,385	16,568
Operating Segments [Member] | Business Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	17,692	17,487	52,913	51,877
Operations and Support Expenses	10,921	11,295	32,966	32,836
EBITDA	6,771	6,192	19,947	19,041
Depreciation and Amortization	2,474	2,331	7,276	7,009
Operating Income (Loss)	4,297	3,861	12,671	12,032
Equity in Net Income (Loss) of Affiliates	0	0	0	0
Segment Contribution	4,297	3,861	12,671	12,032
Operating Segments [Member] | Entertainment And Internet Services [Member]
Segment Reporting Information [Line Items]
Revenue	10,858	5,553	22,300	16,640
Operations and Support Expenses	8,450	4,781	18,222	14,182
EBITDA	2,408	772	4,078	2,458
Depreciation and Amortization	1,389	1,109	3,519	3,396
Operating Income (Loss)	1,019	(337)	559	(938)
Equity in Net Income (Loss) of Affiliates	2	0	(16)	0
Segment Contribution	1,021	(337)	543	(938)
Operating Segments [Member] | Consumer Mobility [Member]
Segment Reporting Information [Line Items]
Revenue	8,784	9,208	26,317	27,247
Operations and Support Expenses	5,065	5,731	15,808	17,173
EBITDA	3,719	3,477	10,509	10,074
Depreciation and Amortization	976	950	2,912	2,846
Operating Income (Loss)	2,743	2,527	7,597	7,228
Equity in Net Income (Loss) of Affiliates	0	(1)	0	(1)
Segment Contribution	2,743	2,526	7,597	7,227
Operating Segments [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenue	1,526	0	2,253	0
Operations and Support Expenses	1,384	0	2,131	0
EBITDA	142	0	122	0
Depreciation and Amortization	225	0	346	0
Operating Income (Loss)	(83)	0	(224)	0
Equity in Net Income (Loss) of Affiliates	(4)	0	(4)	153
Segment Contribution	(87)	0	(228)	153
Operating Segments [Member] | Segment Total [Member]
Segment Reporting Information [Line Items]
Revenue	38,860	32,248	103,783	95,764
Operations and Support Expenses	25,820	21,807	69,127	64,191
EBITDA	13,040	10,441	34,656	31,573
Depreciation and Amortization	5,064	4,390	14,053	13,251
Operating Income (Loss)	7,976	6,051	20,603	18,322
Equity in Net Income (Loss) of Affiliates	(2)	(1)	(20)	152
Segment Contribution	7,974	6,050	20,583	18,474
Consolidation Non-Segment [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	316	709	984	2,244
Operations and Support Expenses	315	791	785	2,027
EBITDA	1	(82)	199	217
Depreciation and Amortization	3	24	47	77
Operating Income (Loss)	(2)	(106)	152	140
Consolidation Non-Segment [Member] | Acquisition-related items [Member]
Segment Reporting Information [Line Items]
Revenue	(85)	0	(85)	0
Operations and Support Expenses	611	213	1,604	403
EBITDA	(696)	(213)	(1,689)	(403)
Depreciation and Amortization	1,198	125	1,439	378
Operating Income (Loss)	(1,894)	(338)	(3,128)	(781)
Consolidation Non-Segment [Member] | Certain Significant Items [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operations and Support Expenses	157	0	374	0
EBITDA	(157)	0	(374)	0
Depreciation and Amortization	0	0	0	0
Operating Income (Loss)	$ (157)	$ 0	$ (374)	$ 0