Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities (Details 2) (USD $)	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012
Other investment securities:
ARS and other investments, total carrying value	$ 112,474,000	$ 106,172,000
Restricted cash related to litigation released during the period	42,000,000
Clearwire
Other investment securities:
Call option notice period of debt securities after the specified date	30 days
VRDN
Other investment securities:
Settlement period	5 days
ARS and other, noncurrent
Other investment securities:
ARS and other investments, total carrying value	112,000,000
ARS and other investments, portion for which the fair value election was made	67,000,000
Current marketable investment securities - strategic \| Clearwire
Other investment securities:
Carrying value of debt securities of a single issuer	755,000,000	751,000,000
Fair value of debt securities of a single issuer	$ 950,000,000	$ 951,000,000

The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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