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Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Significant Accounting Policies [Line Items]
Unrecognized Tax Benefits	$ 3
Allocated Share-based Compensation Expense	$ 13	$ 9

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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