Income Taxes (Details) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Dec. 31, 2010 USD ($)
Income Taxes (Textuals) [Abstract]
Tax expenses	$ 94	$ 55	$ 220	$ 151
Income before income taxes	305	42	611	153
Income Tax Effects Allocated Directly to Equity, Other		13		17
Income Tax Reconciliation, Tax Contingencies	5		23
Unrecognized tax benefits, if recognized, would have a favorable impact on our tax expense					87
Tax expense, that would have a favorable impact of Unrecognized tax benefits					81
Accrued Interest					13
Unsettled unrecognized tax benefits that would require cash					23
Unsettled accrued interest that would require cash					$ 13
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 2004 are still open to examination by foreign taxing authorities, and in Germany, we are open to examination from 2006 onward. In the United States, we are open to examination for 2011.