Derivatives and Hedging Activities (Details 3) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (33)	$ (11)	$ 22	$ (22)
Interest Expense [Member] | Short-term Debt [Member] | Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	2	2	3	4
Interest Expense [Member] | Long-term Debt [Member] | Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	31	23	61	42
Other Expense [Member] | Interest rate contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	0	(13)	2	(14)
Other Expense [Member] | Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	(68)	(22)	(49)	(54)
Interest Income [Member] | Foreign exchange contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	3	0	5	1
Other Income [Member] | Equity-linked contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in income	$ (1)	$ (1)	$ 0	$ (1)