Derivative Instruments - Impact on Statements of Income, Net Investment Hedges (Details) - Net Investment Hedging - Foreign exchange contracts - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net investment hedge gains and losses [Abstract]
Excluded components recorded directly in income	$ (91)	$ (122)	$ (189)	$ (227)
Effective portion recorded in OCI	$ (250)	$ (208)	$ 743	$ (362)