Derivatives and Hedging Activities (Details 3) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (14)	$ 132	$ 8	$ 112
Foreign exchange contracts [Member] | Interest Expense [Member] | Short-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	0	2	3	6
Foreign exchange contracts [Member] | Interest Expense [Member] | Long-term Debt [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	33	24	94	66
Interest rate contracts [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	0	3	2	(11)
Foreign exchange contracts [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(48)	101	(97)	49
Foreign exchange contracts [Member] | Interest Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	2	1	7	2
Equity-linked contract [Member] | Other Income [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (1)	$ 1	$ (1)	$ 0