Derivatives (Details 3) In Millions, unless otherwise specified		12 Months Ended									1 Months Ended
	Dec. 31, 2011 Fixed rate Eurobond Due 2014 EUR (€)	Dec. 31, 2007 Eurobond 750 Million Euros Issued July2007 EUR (€) Y	Dec. 31, 2007 Eurobond 275 Million Euros Issued December2007 EUR (€) Y	Dec. 31, 2011 Net Investment Hedges USD ($)	Dec. 31, 2010 Net Investment Hedges USD ($)	Dec. 31, 2009 Net Investment Hedges USD ($)	Dec. 31, 2009 Net Investment Hedges Cross currency interest rate contract USD ($)	Dec. 31, 2011 Net Investment Hedges Foreign Currency Denominated Debt USD ($)	Dec. 31, 2010 Net Investment Hedges Foreign Currency Denominated Debt USD ($)	Dec. 31, 2009 Net Investment Hedges Foreign Currency Denominated Debt USD ($)	Jul. 31, 2007 Net Investment Hedges Foreign Currency Denominated Debt Eurobond 750 Million Euros Issued July2007 EUR (€) Y	Dec. 31, 2007 Net Investment Hedges Foreign Currency Denominated Debt Eurobond 275 Million Euros Issued December2007 EUR (€) Y
Net investment hedges
Pretax Gain (Loss) Recognized as Cumulative Translation within Other Comprehensive Income on Effective Portion of Instrument				$ 41	$ 111	$ (39)	$ (12)	$ 41	$ 111	$ (27)
Term of debt instrument (in years)		7	7								7	7
Face amount	€ 775.0	€ 750.0	€ 275.0								€ 750.0	€ 275.0