Investment Securities (Details 6) (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	Mar. 31, 2013
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%
Aggregate principal amount of investment held		$ 0

Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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- Definition

The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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