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Investment Securities (Details 7) (Terre Star Network Inc., 6 1/2 % Senior Exchangeable Paid-In-Kind Notes Due June 15, 2014, USD $)
In Millions, unless otherwise specified
1 Months Ended
Feb. 29, 2008
Dec. 31, 2012
Terre Star Network Inc. | 6 1/2 % Senior Exchangeable Paid-In-Kind Notes Due June 15, 2014
   
Marketable investment securities:    
Aggregate principal amount of investment acquired $ 50  
Interest rate (as a percent)   6.50%