Financial Instruments (Free-standing derivatives) (Details) - Free Standing Derivatives [Member] - Nondesignated as Hedges - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Free standing derivatives
Gain (loss) on derivatives	$ (2,647)	$ (578)
Interest Rate Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	(101)	(53)
Foreign Exchange Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	(2,492)	(565)
Other Contract [Member]
Free standing derivatives
Gain (loss) on derivatives	$ (54)	$ 40