Derivatives and Hedging (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 8	$ (11)	$ 8	$ (13)
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	18		18
Derivatives accounted for as hedges: | Cash flow hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	16	(9)	(14)	(32)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(7)	3	(23)	(11)
Interest rate contracts | Derivatives accounted for as hedges: | Cash flow hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss		1		(1)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)				1
Foreign exchange contracts | Derivatives accounted for as hedges: | Cash flow hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	16	(10)	(14)	(31)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(7)	3	(23)	(12)
Foreign exchange contracts | Derivatives accounted for as hedges: | Net Investment Hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	3	13	4	(4)
Foreign exchange contracts | Derivatives accounted for as hedges: | Fair value hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	(3)	2
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	3	(3)		1
Foreign exchange contracts | Derivatives not accounted for as hedges:
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 6	$ (9)	$ 12	$ (9)