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Derivative Financial Instruments Derivative Financial Instruments - Fair Value of Derivatives and Balance Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative assets $ 84,852 $ 95,353
Derivative liabilities 82,501 94,782
Less: Gross amounts of receivable / payable subject to enforcable master netting agreements (4) (6) 69,353 [1],[2] 78,244 [1],[2]
Less: Gross amounts of receivable / payable subject to enforcable master netting agreements (4) (6) 69,353 [1],[2] 78,244 [1],[2]
Net amounts of derivative assets / liabilities presented in the balance sheet 10,452 11,986
Net amounts of derivative assets / liabilities presented in the balance sheet 11,211 15,202
Derivative Asset, Fair Value, Amount Offset Against Collateral 5,047 [2],[3] 5,123 [2],[3]
Derivative Liability, Fair Value, Amount Offset Against Collateral 1,937 [2],[3] 1,336 [2],[3]
Less: Gross amounts of financial instrument collateral received / posted subject to enforcable master netting agreements but not offset in the consolidated balance sheet 1,209 627
Less: Gross amounts of financial instrument collateral received / posted subject to enforcable master netting agreements but not offset in the consolidated balance sheet 3,435 4,887
Net amounts of derivative liabilities 7,776 10,315
Net amounts of derivative assets 9,243 11,359
Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Amount Offset Against Collateral 5,000 5,100
Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 56,406 [4] 70,865 [4]
Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 56,731 [4] 70,450 [4]
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 16,130 [5] 13,799 [5]
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 15,543 [5] 13,601 [5]
Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 3,641 791
Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 2,057 738
Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 5,892 7,128
Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,926 7,347
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 184 [6] 10 [6]
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 354 [6] 875 [6]
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 18,411 [4] 17,204 [4]
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0 [4] 16,663 [4]
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 584 511
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0 437
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 48 [6] 0 [6]
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5 [6] 15 [6]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 602 [5] 901 [5]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 93 [5] 97 [5]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 37,923 [4] 53,562 [4]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 56,648 [4] 53,705 [4]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 22 [5] 52 [5]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 54 [5] 17 [5]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 16,125 [5] 13,795 [5]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 15,539 [5] 13,576 [5]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 506 [5] 472 [5]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 224 [5] 126 [5]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,332 [5] 1,287 [5]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 1,334 [5] 1,291 [5]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 8 [5] 0 [5]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 51 [5] 0 [5]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 2,874 [5] 656 [5]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 1,909 [5] 719 [5]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 13 [5] 1 [5]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 10 [5] 4 [5]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 5,308 6,617
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 5,926 6,910
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 116 [6] 47 [6]
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 124 [6] 236 [6]
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets
    
Derivatives, Fair Value [Line Items]    
Derivative assets 136 [6] 10 [6]
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 349 [6] 860 [6]
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 72 [4] 99 [4]
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 83 [4] 82 [4]
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 5 [5] 4 [5]
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 4 [5] 25 [5]
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative assets 767 [5] 135 [5]
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]
    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 148 [5] $ 19 [5]
[1] Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements.
[2] Netting is performed at a counterparty level in cases where enforceable master netting and credit support agreements are in place, regardless of the type of derivative instrument. Therefore, we have not attempted to allocate netting to the different types of derivative instruments shown in the table above.
[3] Represents the netting of cash collateral posted and received by counterparty under enforceable credit support agreements.
[4] Trading related derivative assets/liabilities are recorded in trading assets/trading liabilities on the consolidated balance sheet.
[5] Over-the-counter (OTC) derivatives include derivatives executed and settled bilaterally with counterparties without the use of an organized exchange or central clearing house. The credit risk associated with bilateral OTC derivatives is managed through master netting agreements and obtaining collateral. OTC-cleared derivatives are executed bilaterally in the OTC market but then novated to a central clearing counterparty, whereby the central clearing counterparty becomes the counterparty to both of the original counterparties. Exchange traded derivatives are executed directly on an organized exchange that provides pre-trade price transparency. Credit risk is minimized for OTC-cleared derivatives and exchange traded derivatives through daily margining required by central clearing counterparties.
[6] Derivative assets/liabilities related to cash flow hedges, fair value hedges and derivative instruments held for purposes other than for trading are recorded in other assets / interest, taxes and other liabilities on the consolidated balance sheet.