Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Beginning Balance	$ 69,692	$ 69,273
Goodwill Acquired	36,887	367
Foreign Currency Translation Adjustment	(610)
Allocation of Goodwill	0
Other	(3)	52
Ending Balance	105,966	69,692
Wireless [Member]
Goodwill [Line Items]
Beginning Balance	36,469	36,106
Goodwill Acquired	6	367
Foreign Currency Translation Adjustment	0
Allocation of Goodwill	(36,471)
Other	(4)	(4)
Ending Balance	0	36,469
Wireline [Member]
Goodwill [Line Items]
Beginning Balance	33,223	33,167
Goodwill Acquired	0	0
Foreign Currency Translation Adjustment	0
Allocation of Goodwill	(33,226)
Other	3	56
Ending Balance	0	33,223
Business Solutions [Member]
Goodwill [Line Items]
Beginning Balance	0	0
Goodwill Acquired	0	0
Foreign Currency Translation Adjustment	0
Allocation of Goodwill	44,763
Other	0	0
Ending Balance	44,763	0
Entertainment And Internet Services [Member]
Goodwill [Line Items]
Beginning Balance	0	0
Goodwill Acquired	31,653	0
Foreign Currency Translation Adjustment	0
Allocation of Goodwill	8,422
Other	0	0
Ending Balance	40,075	0
Consumer Mobility [Member]
Goodwill [Line Items]
Beginning Balance	0	0
Goodwill Acquired	0	0
Foreign Currency Translation Adjustment	0
Allocation of Goodwill	16,512
Other	0	0
Ending Balance	16,512	0
International [Member]
Goodwill [Line Items]
Beginning Balance	0	0
Goodwill Acquired	5,228	0
Foreign Currency Translation Adjustment	(610)
Allocation of Goodwill	0
Other	(2)	0
Ending Balance	$ 4,616	$ 0