Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details 2a) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fair value hedge gains (losses) recorded in income
Derivatives	$ (5,505,000,000)	$ (3,997,000,000)
Hedged items	5,132,000,000	4,357,000,000
Total income statement impact	(373,000,000)	360,000,000
Hedge ineffectiveness	55,000,000	(10,000,000)
Excluded components	(428,000,000)	370,000,000
Interest rate contract
Fair value hedge gains (losses) recorded in income
Derivatives	(375,000,000)	(718,000,000)
Hedged items	488,000,000	800,000,000
Total income statement impact	113,000,000	82,000,000
Hedge ineffectiveness	28,000,000	(9,000,000)
Excluded components	85,000,000	91,000,000
Foreign exchange
Fair value hedge gains (losses) recorded in income
Derivatives	(2,954,000,000)	(3,206,000,000)
Hedged items	2,950,000,000	3,124,000,000
Total income statement impact	(4,000,000)	(82,000,000)
Hedge ineffectiveness	0	0
Excluded components	(4,000,000)	(82,000,000)
Included revenue related to certain foreign exchange trading derivatives	(2,800,000,000)	(3,200,000,000)
Commodity
Fair value hedge gains (losses) recorded in income
Derivatives	(2,176,000,000)	(73,000,000)
Hedged items	1,694,000,000	433,000,000
Total income statement impact	(482,000,000)	360,000,000
Hedge ineffectiveness	27,000,000	(1,000,000)
Excluded components	$ (509,000,000)	$ 361,000,000