Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes (Textuals) [Abstract]
Tax expenses	$ 48	$ 62
Income before income taxes	56	186
Income Tax Reconciliation, Tax Contingencies	3	8
Unrecognized tax benefits, if recognized, would have a favorable impact on our tax expense			90
Tax expense, that would have a favorable impact of Unrecognized tax benefits			84
Accrued Interest			24
Unsettled unrecognized tax benefits that would require cash			23
Unsettled accrued interest that would require cash			$ 24
Change in unrecognized tax benefits during the next 12 months	It is reasonably possible that our unrecognized tax benefits may change during the next 12 months. However, we do not expect changes during the next 12 months to have a significant impact on our financial position or results of operations.
Open tax years by major tax jurisdiction	Generally, years beginning after 2006 are still open to examination by foreign taxing authorities, including in Germany. In the United States, we are open to examination for 2011.