Derivatives (Details 2) In Millions, unless otherwise specified	12 Months Ended					1 Months Ended		12 Months Ended							1 Months Ended			1 Months Ended				12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Fixed rate Eurobond Due 2014 EUR (€)	Dec. 31, 2007 Fixed rate Eurobond Due 2014	Oct. 31, 2008 Floating rate Medium-term note due 2011 USD ($) Y	Nov. 30, 2006 Fixed rate note which matured in November 2009 USD ($) Y	Dec. 31, 2007 Eurobond 750 Million Euros Issued July2007 EUR (€) Y	Aug. 31, 2010 Eurobond 750 Million Euros Issued July2007 EUR (€)	Jul. 31, 2007 Interest rate swaps Fixed rate Eurobond Due 2014 EUR (€)	Oct. 31, 2008 Interest rate swaps Floating rate Medium-term note due 2011 USD ($) Derivative	Nov. 30, 2006 Interest rate swaps Fixed rate note which matured in November 2009 USD ($)	Nov. 30, 2008 Fair value hedges USD ($)	Dec. 31, 2011 Fair value hedges Interest rate swaps USD ($)	Nov. 30, 2006 Fair value hedges Interest rate swaps Fixed rate note which matured in November 2009 Y	Jul. 31, 2007 Fair value hedges Interest rate swaps Eurobond 750 Million Euros Issued July2007 EUR (€) Y	Aug. 31, 2010 Fair value hedges Interest rate swaps Eurobond 750 Million Euros Issued July2007 EUR (€)	Nov. 30, 2006 Net Investment Hedges Interest rate swaps Y	Sep. 30, 2006 Net Investment Hedges Interest rate swaps Y	Nov. 30, 2006 Net Investment Hedges Cross Currency Interest Rate Contract European Subsidiaries Issued November 2006 [Member] USD ($)	Sep. 30, 2006 Net Investment Hedges Cross Currency Interest Rate Contract Japanese Subsidiaries Issued September 2006 [Member] USD ($)	Dec. 31, 2011 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2010 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2009 Derivatives designated as hedging instruments Fair value hedges USD ($)
Derivatives in Fair Value Hedging Relationships or Net Investment Hedges
Notional amount, interest rate swaps designated as fair value hedges											$ 800	$ 400		$ 342		€ 400
Notional amount, net investment hedges																				200	300
Term of debt instrument (in years)						3	3	7							3	7		3	3
Term of interest rate swap (in years)																				3	3
Face amount				775.0		800.0	400.0	750.0		750.0	800.0					750.0
Termination of notional amount of fixed-to-floating interest rate swap									150								150
Gain (loss) on termination of fixed-to-floating interest rate swap will be amortized over this debt's remaining life																	18
Number of fixed-to-floating interest rate swaps											2
Interest rate, stated percentage (as a percent)					5.00%	4.50%		5.00%			4.50%
Gain (Loss) on Derivative Recognized in income	(10)	(16)	16																			(10)	(16)	16
Gain (Loss) on Hedged Item Recognized in Income	10	16	(16)																			10	16	(16)
Foreign currency forward contracts notional amount													$ 255