Fair Value Measurements (Details 2) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	$ 768	$ 1,828	$ 1,665	$ 4,129
Cash Instruments [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	746	191	1,913	855
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	(95)	(109)	(67)	(60)
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	651	82	1,846	795
Derivatives Net [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	456	1,386	93	2,852
Receivables from customers and counterparties at fair value [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	5	(21)	21	(48)
Other Secured Financings At Fair Value [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	5	50	(4)	39
Unsecured Short-Term Borrowings Including Current Portion Of Unsecured Long Term Borrowings At Fair Value [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	(82)	224	174	307
Unsecured Long-term Borrowings At Fair Value [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	(117)	124	(162)	137
Other Liabilities And Accrued Expenses At Fair Value [Member]
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date
Net Unrealized Gains / (Losses) Relating to Instruments Still Held at the Reporting Date	$ (150)	$ (17)	$ (303)	$ 47

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from total assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from assets and liabilities net measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from derivative contracts net measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

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- Definition

This element represents total net unrealized gains or losses for the period relating to instruments still held at the reporting date, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings.

+ Details

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