Derivatives (Details 2-IS & OCI) (Fair Value Hedges [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net interest and other [Member] | Interest rate [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Gain (loss) on derivative instruments recognized in income	$ 12	$ 3	$ 12	$ (1)
Net interest and other [Member] | Long-term Debt [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	(12)	(3)	(12)	1
Provision For Income Taxes [Member] | Foreign currency [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Gain (loss) on derivative instruments recognized in income	(32)		(40)
Provision For Income Taxes [Member] | Accrued Taxes [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge	32		40
Loss On Early Extinguishment Of Debt [Member] | Interest rate [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Gain (loss) on derivative instruments recognized in income				29
Loss On Early Extinguishment Of Debt [Member] | Long-term Debt [Member]
Gain (Loss) on Derivative Instruments [Line Items]
Change in unrealized gain (loss) on hedged item in fair value hedge				$ (29)