Significant Accounting Policies (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Unrecognized Tax Benefits	$ 3		$ 3		$ 4
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities			53
Income Tax Payable to Parent	141		141
Income Tax Receivable Affiliate					48
Allocation of Stock Based Compensation Expense from Affiliate	$ 12	$ 6	$ 32	$ 20