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]
Effective Income Tax Rate, Continuing Operations	31.00%	32.00%
Unrecognized Tax Benefits	$ 3
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities	$ 1
Time Period of Decrease in Unrecognized Tax Benefits	12 months
Minimum [Member]
Significant Accounting Policies [Line Items]
Finite Lived Asset Useful Life	3 years
Maximum [Member]
Significant Accounting Policies [Line Items]
Finite Lived Intangible Asset, Useful Life 1	28 years