Derivatives and Hedging (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 1		$ 8		$ (8)		$ 8
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	27				27
Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		16		(28)		(14)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(10)		(7)		(8)		(23)
Interest rate contracts [Member] | Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		0		0		0
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	0	[1]	0	[1]	(1)	[2]	0	[2]
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	0		0		0		0
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Cash flow hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		16		(28)		(14)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	(10)	[3]	(7)	[3]	(7)	[3]	(23)	[3]
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Net Investment Hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) recognized in Accumulated Other Comprehensive Loss	0		3		0		4
Foreign exchange contracts [Member] | Derivatives accounted for as hedges [Member] | Fair value hedges
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	(7)	[4],[5]	(3)	[4],[5]	(8)	[4],[5]	0	[4],[5]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	7	[4]	3	[4]	8	[4],[5]	0	[4],[5]
Foreign exchange contracts [Member] | Derivatives not accounted for as hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 3		$ 6		$ (15)		$ 12

[1] Included within Other current assets or Other non-current assets

[2] Included within Fiduciary investment income and Interest expense

[3] Included within Other income (expense) and Interest expense

[4] Included in Interest expense

[5] Relates to fixed rate debt