Derivatives (Details 3) (Net Investment Hedges) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2011 USD ($)	Jul. 31, 2007 Foreign Currency Denominated Debt EUR (€) Y	Jun. 30, 2012 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2011 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2012 Foreign Currency Denominated Debt USD ($)	Jun. 30, 2011 Foreign Currency Denominated Debt USD ($)	Dec. 31, 2007 Foreign Currency Denominated Debt EUR (€) Y
Net investment hedges
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument	$ 90	$ (35)	$ 50	$ (120)		$ 90	$ (35)	$ 50	$ (120)
Ineffective Portion of Gain (Loss) on Derivative and Amount Excluded from Effectiveness Testing Recognized in Income	0	0	0	0		0	0	0	0
Term of debt instrument (in years)					7					7
Face amount					€ 750					€ 275