Segment Information (Summary Of Operating Revenues And Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 40,520	$ 33,015	$ 81,055	$ 65,591
Operations and Support Expenses	27,384	22,546	54,225	44,987
EBITDA	13,136	10,469	26,830	20,604
Depreciation and Amortization	6,576	4,696	13,139	9,274
Operating Income (Loss)	6,560	5,773	13,691	11,330
Equity in Net Income (Loss) of Affiliates	28	33	41	33
Segment Contribution	5,421	4,922	11,428	9,650
Operating Segments [Member] | Business Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	17,579	17,664	35,188	35,221
Operations and Support Expenses	10,857	10,972	21,659	22,045
EBITDA	6,722	6,692	13,529	13,176
Depreciation and Amortization	2,521	2,460	5,029	4,802
Operating Income (Loss)	4,201	4,232	8,500	8,374
Equity in Net Income (Loss) of Affiliates	0	0	0	0
Segment Contribution	4,201	4,232	8,500	8,374
Operating Segments [Member] | Entertainment Group [Member]
Segment Reporting Information [Line Items]
Revenue	12,711	5,782	25,369	11,442
Operations and Support Expenses	9,569	4,913	19,147	9,772
EBITDA	3,142	869	6,222	1,670
Depreciation and Amortization	1,489	1,065	2,977	2,130
Operating Income (Loss)	1,653	(196)	3,245	(460)
Equity in Net Income (Loss) of Affiliates	(2)	(12)	1	(18)
Segment Contribution	1,651	(208)	3,246	(478)
Operating Segments [Member] | Consumer Mobility [Member]
Segment Reporting Information [Line Items]
Revenue	8,186	8,755	16,514	17,533
Operations and Support Expenses	4,680	5,202	9,592	10,743
EBITDA	3,506	3,553	6,922	6,790
Depreciation and Amortization	932	934	1,854	1,936
Operating Income (Loss)	2,574	2,619	5,068	4,854
Equity in Net Income (Loss) of Affiliates	0	0	0	0
Segment Contribution	2,574	2,619	5,068	4,854
Operating Segments [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenue	1,828	491	3,495	727
Operations and Support Expenses	1,723	529	3,311	747
EBITDA	105	(38)	184	(20)
Depreciation and Amortization	298	93	575	121
Operating Income (Loss)	(193)	(131)	(391)	(141)
Equity in Net Income (Loss) of Affiliates	9	0	23	0
Segment Contribution	(184)	(131)	(368)	(141)
Operating Segments [Member] | Segment Total [Member]
Segment Reporting Information [Line Items]
Revenue	40,304	32,692	80,566	64,923
Operations and Support Expenses	26,829	21,616	53,709	43,307
EBITDA	13,475	11,076	26,857	21,616
Depreciation and Amortization	5,240	4,552	10,435	8,989
Operating Income (Loss)	8,235	6,524	16,422	12,627
Equity in Net Income (Loss) of Affiliates	7	(12)	24	(18)
Segment Contribution	8,242	6,512	16,446	12,609
Consolidation Non-Segment [Member] | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenue	216	323	489	668
Operations and Support Expenses	293	236	670	470
EBITDA	(77)	87	(181)	198
Depreciation and Amortization	20	24	37	44
Operating Income (Loss)	(97)	63	(218)	154
Consolidation Non-Segment [Member] | Acquisition-related items [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operations and Support Expenses	233	694	528	993
EBITDA	(233)	(694)	(528)	(993)
Depreciation and Amortization	1,316	120	2,667	241
Operating Income (Loss)	(1,549)	(814)	(3,195)	(1,234)
Consolidation Non-Segment [Member] | Certain Significant Items [Member]
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operations and Support Expenses	29	0	(682)	217
EBITDA	(29)	0	682	(217)
Depreciation and Amortization	0	0	0	0
Operating Income (Loss)	$ (29)	$ 0	$ 682	$ (217)