Acquisitions, Dispositions And Other Adjustments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended
	Aug. 31, 2010	Mar. 31, 2011 T-Mobile [Member]	Dec. 31, 2010 Qualcomm [Member]	Jul. 31, 2011 Convergys [Member]
Business Acquisition [Line Items]
Approximate acquisition value		$ 39,000
Approximate acquisition value of Convergys' minority interests				320
Acquisition date				July 1, 2011
Amount of cash paid or to be paid to acquire		25,000
Value of the acquiring company's common stock given or to be given as consideration to the selling entity		14,000
Number of customers served		34,000,000
Contingent termination fee		3,000
Unsecured bridge financing, maximum amount		20,000
Unsecured bridge financing, lender commitments		0
Unsecured bridge financing, covenant debt ratio		3.0
Licenses purchase agreement date - Qualcomm lower 700 MHz license frequency			December 2010
Qualcomm lower 700 MHz frequency license purchase price agreement - cost			1,925
Proceeds from sale of Sterling subsidiary	1,400
Gain on sale of Sterling subsidiary	$ 769