Derivatives and Hedging (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ 9		$ (2)		$ (9)		$ 0
Estimated pretax losses currently included within Accumulated Other Comprehensive Loss that will be reclassified to earnings in next twelve months	33				33
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		(32)		(29)		(30)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	14		(8)		2		(16)
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
Amount of Gain (Loss) Recognized in Income on Derivative					(1)	[3],[4]	3	[3],[4]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item					1	[3],[4]
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		(32)		(29)		(30)
Amount of Gain (Loss) reclassified from Accumulated Other Comprehensive Loss into income (effective portion)	14	[5]	(8)	[5]	3	[5]	(16)	[5]
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		11		0		1
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	0	[3],[4]	1	[3],[4]
Amount of Gain (Loss) Recognized in Income on Related Hedged Item	0	[4]	(1)	[4]			(3)	[3],[4]
Foreign exchange contracts [Member] | Derivatives not accounted for as hedges [Member]
Derivative Instruments, Gain (Loss)
Amount of Gain (Loss) Recognized in Income on Derivative	$ (9)		$ 1		$ (18)		$ 7

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

[2] Included within Fiduciary investment income and Interest expense

[3] Relates to fixed rate debt

[4] Included in Interest expense

[5] Included within Other income and Interest expense