v2.4.0.8

Acquisitions And Divestitures Acquisition of Unwired Holdings, Inc. (Details) (USD $) In Millions, unless otherwise specified |  |  | 3 Months Ended |  | 3 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2014 Subsequent Event [Member] Unwired Technology, LLC [Member] | Oct. 01, 2014 Subsequent Event [Member] Unwired Technology, LLC [Member] | Dec. 31, 2014 Subsequent Event [Member] Unwired Technology, LLC [Member] Minimum [Member] | Dec. 31, 2014 Subsequent Event [Member] Unwired Technology, LLC [Member] Maximum [Member]
Business Acquisition [Line Items] |  |  |  |  |  |
Date of Acquisition |  |  | Oct. 01, 2014 |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  | 100.00% |  |
Purchase Price, net of acquired cash, excess net working capital and certain tax benefits |  |  | $ 190 |  |  |
Acquired cash, excess net working capital and certain tax benefits from acquisition |  |  | 20 |  |  |
Identifiable net assets acquired |  |  |  | 25 |  |
Goodwill | 456 | 496 |  | 120 |  |
Intangible Assets Acquired, Other than Goodwill |  |  |  | $ 65 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 10 years | 12 years

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