Financial Instruments (Net investment hedges in foreign operations) (Details) (Foreign Exchange Contract [Member], Net Investment Hedge [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
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)
Gain (loss) on hedged items	$ (147)	$ (161)	$ (458)	$ (514)