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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Potential increase in current tax liability due to NOPA	$ 130
Income taxes receivable	45
Income taxes payable		$ 20

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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