Subsequent Events (Details) (USD $)							6 Months Ended				12 Months Ended
	Jul. 10, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jul. 10, 2013 SoftBank [Member]	Jun. 30, 2013 Pending Litigation [Member]	Jul. 10, 2013 Starburst II, Inc. [Member]	Jun. 30, 2013 Starburst II, Inc. [Member]	Dec. 31, 2012 Starburst II, Inc. [Member]	Dec. 31, 2012 Starburst II, Inc. [Member] Business Acquisition [Member]	Jul. 10, 2013 Starburst II, Inc. [Member] Business Acquisition [Member]	Jun. 20, 2013 Starburst II, Inc. [Member] Business Acquisition [Member]	Jul. 10, 2013 Starburst II, Inc. [Member] Business Acquisition [Member] SoftBank [Member]
Subsequent Event [Line Items]
Cash and Cash Equivalents, at Carrying Value		$ 5,596,000,000	$ 6,351,000,000	$ 5,860,000,000	$ 5,447,000,000				$ 11,461,000	$ 5,000,000		$ 1,900,000,000
Debt Conversion, Original Debt, Amount								3,100,000,000			3,100,000,000
Business Acquisition, Percentage of Voting Interests Acquired						78.00%								78.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	22.00%											22.00%
Business Acquisition, Cost of Acquired Entity, Purchase Price	22,300,000,000											22,300,000,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High												16,600,000,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value												5,300,000,000
Business Acquisition, Value of Equity Based Compensation Awards to be Converted												400,000,000
Business Acquisition, Cost of Acquired Entity, Cash Paid													3,700,000,000	18,500,000,000
Damages Resulting from Class Members' Breach of Term Contracts							18,000,000
Estimated Amount of Termination Fees Collected identified in a Previous Trial							$ 73,000,000