Derivative Instruments - Impact on Balance Sheets, after Netting Adjustments (Details 1b) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Derivative receivables and payables
Derivative Assets	$ 85,010	$ 92,477
Derivative Liabilities	74,767	74,977
Interest rate contract
Derivative receivables and payables
Derivative Assets	41,520	46,369
Derivative Liabilities	24,235	28,010
Credit derivatives
Derivative receivables and payables
Derivative Assets	6,258	6,684
Derivative Liabilities	6,996	5,610
Foreign exchange
Derivative receivables and payables
Derivative Assets	13,056	17,890
Derivative Liabilities	15,534	17,435
Equity
Derivative receivables and payables
Derivative Assets	8,995	6,793
Derivative Liabilities	12,909	9,655
Commodity
Derivative receivables and payables
Derivative Assets	15,181	14,741
Derivative Liabilities	15,093	14,267
Designated as Hedging Instrument [Member] | Foreign currency-denominated debt [Member]
Derivatives, Fair Value [Line Items]
Net Investment Hedge Derivative Liabilities At Fair Value, Excluded From Derivative Fair Value of Derivative Net	$ 10	$ 11