Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair value hedge gains (losses) recorded in income
Derivatives	$ (4,080)	$ (6,795)	$ 8,000
Hedged items	4,411	5,935	(6,608)
Total income statement impact	331	(860)	1,392
Income statement impact due to, Hedge ineffectiveness	(94)	79	94
Income statement impact due to, Excluded components	425	(939)	1,298
Interest rate contract [Member]
Fair value hedge gains (losses) recorded in income
Derivatives	(3,469)	(1,238)	532
Hedged items	4,851	1,879	33
Total income statement impact	1,382	641	565
Income statement impact due to, Hedge ineffectiveness	(132)	(28)	104
Income statement impact due to, Excluded components	1,514	669	461
Foreign exchange [Member]
Fair value hedge gains (losses) recorded in income
Derivatives	(1,096)	(3,027)	5,684
Hedged items	864	2,925	(3,761)
Total income statement impact	(232)	(102)	1,923
Income statement impact due to, Hedge ineffectiveness	0	0	0
Income statement impact due to, Excluded components	(232)	(102)	1,923
Included revenue related to certain foreign exchange trading derivatives	(556)	(3,100)	4,900
Commodity [Member]
Fair value hedge gains (losses) recorded in income
Derivatives	485	(2,530)	1,784
Hedged items	(1,304)	1,131	(2,880)
Total income statement impact	(819)	(1,399)	(1,100)
Income statement impact due to, Hedge ineffectiveness	38	107	(10)
Income statement impact due to, Excluded components	$ (857)	$ (1,506)	$ (1,086)