Financial Instruments (Net investment hedges in foreign operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net investment hedges in foreign operation
Hedge ineffectiveness gain (loss)			$ (74)	$ (55)
Net Investment Hedge [Member]
Net investment hedges in foreign operation
Hedge ineffectiveness gain (loss)	(147)	(161)	(458)	(514)
Foreign Exchange Contract [Member] | Net Investment Hedge [Member]
Net investment hedges in foreign operation
Gain (loss) recognized in AOCI	2,792	645	2,194	3,162
Gain (loss) reclassified from AOCI into earnings	$ (24)	$ (169)	$ (14)	$ (278)