Derivatives (Details 1) In Millions, unless otherwise specified		1 Months Ended		1 Months Ended			1 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2014 Eurobond repaid July 2014 EUR (€)	Jun. 30, 2014 Fixed rate medium term note due 2019 USD ($)	Dec. 31, 2014 Fixed rate medium term note due 2019 USD ($)	Jul. 31, 2007 Fair value hedges Interest rate swap contracts Eurobond repaid July 2014 EUR (€)	Jul. 31, 2014 Fair value hedges Interest rate swap contracts Eurobond repaid July 2014 EUR (€)	Aug. 31, 2010 Fair value hedges Interest rate swap contracts Eurobond repaid July 2014 EUR (€)	Nov. 30, 2013 Fair value hedges Interest rate swap contracts Eurobond Due 2021 EUR (€)	Jun. 30, 2014 Fair value hedges Interest rate swap contracts Fixed rate medium term note due 2019 USD ($)	Dec. 31, 2014 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2013 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Fair value hedges USD ($)	Dec. 31, 2014 Derivatives designated as hedging instruments Fair value hedges Interest rate swap contracts USD ($)	Dec. 31, 2014 Derivatives designated as hedging instruments Fair value hedges Interest rate swap contracts Interest expense USD ($)	Dec. 31, 2013 Derivatives designated as hedging instruments Fair value hedges Interest rate swap contracts Interest expense USD ($)	Dec. 31, 2012 Derivatives designated as hedging instruments Fair value hedges Interest rate swap contracts Interest expense USD ($)
Derivatives in Fair Value Hedging Relationships
Derivative notional amount		$ 600		€ 400			€ 300	$ 600				$ 1,000
Term of debt instrument		5 years		7 years			8 years	5 years
Face amount	1,025	625	600	750			600	625
Termination of notional amount of fixed-to-floating interest rate swap						150
Remaining amount matured from Interest Rate Swap					250
Gain (loss) on termination of fixed-to-floating interest rate swap will be amortized over this debt's remaining life						18
Interest rate, stated percentage (as a percent)		1.625%					1.875%	1.625%
Gain (Loss) on Derivative Recognized in income									11	(21)	(5)		11	(21)	(5)
Gain (Loss) on Hedged Item Recognized in Income									$ (11)	$ 21	$ 5		$ (11)	$ 21	$ 5