Derivatives (Details 3) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2007 Net Investment Hedges EUR (€) Y	Jun. 30, 2011 Net Investment Hedges USD ($)	Jun. 30, 2010 Net Investment Hedges USD ($)	Jun. 30, 2011 Net Investment Hedges USD ($)	Jun. 30, 2010 Net Investment Hedges USD ($)	Dec. 31, 2007 Net Investment Hedges EUR (€) Y	Jun. 30, 2011 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2010 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2011 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2010 Foreign Currency Denominated Debt USD ($)
Net investment hedges
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative		$ (35)	$ 135	$ (120)	$ 225		$ (35)	$ 135	$ (120)	$ 225
Term of debt instrument (in years)	7					7
Face amount	€ 750.0					€ 275.0