Derivative Instruments - Impact on Statements of Income, Net Investment Hedges (Details 2c) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Investment Hedging [Member]
Net investment hedge gains and losses [Abstract]
Excluded components recorded directly in income	$ (306)	$ (251)	$ (139)
Gains/(losses)- effective portion recorded in OCI	(82)	226	11
Net Investment Hedging [Member] | Foreign exchange
Net investment hedge gains and losses [Abstract]
Excluded components recorded directly in income	(306)	(251)	(139)
Gains/(losses)- effective portion recorded in OCI	(82)	225	(30)
Net Investment Hedging [Member] | Foreign currency-denominated debt [Member]
Net investment hedge gains and losses [Abstract]
Excluded components recorded directly in income	0	0	0
Gains/(losses)- effective portion recorded in OCI	0	1	41
Accumulated Translation Adjustment [Member]
Net investment hedge gains and losses [Abstract]
Gains/(losses)- effective portion recorded in OCI	$ (82)	$ 226	$ 11