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Derivatives - Sales and Trading Revenue (Details) (USD $)
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12 Months Ended | |||||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Derivatives, Fair Value [Line Items] | ||||||||||
| Brokerage Commissions Revenue | $ 2,200,000,000 | $ 2,300,000,000 | ||||||||
| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 12,641,000,000 | 16,415,000,000 | 16,374,000,000 | |||||||
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Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 6,424,000,000 | 9,630,000,000 | 11,559,000,000 | |||||||
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Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 2,738,000,000 | [1],[2] | 2,723,000,000 | [1],[2] | (395,000,000) | [1],[2] | ||||
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Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 3,479,000,000 | 4,062,000,000 | 5,210,000,000 | |||||||
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Income Interest Rate [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 3,033,000,000 | 2,782,000,000 | 4,244,000,000 | |||||||
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Income Interest Rate [Member] | Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 2,118,000,000 | 2,032,000,000 | 3,125,000,000 | |||||||
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Income Interest Rate [Member] | Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | (8,000,000) | [1],[2] | 91,000,000 | [1],[2] | (16,000,000) | [1],[2] | ||||
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Income Interest Rate [Member] | Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 923,000,000 | 659,000,000 | 1,135,000,000 | |||||||
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Foreign Exchange [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 1,031,000,000 | 840,000,000 | 973,000,000 | |||||||
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Foreign Exchange [Member] | Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 1,088,000,000 | 903,000,000 | 950,000,000 | |||||||
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Foreign Exchange [Member] | Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | (65,000,000) | [1],[2] | (63,000,000) | [1],[2] | (3,000,000) | [1],[2] | ||||
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Foreign Exchange [Member] | Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 8,000,000 | 26,000,000 | ||||||||
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Equity [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 3,943,000,000 | 4,101,000,000 | 4,590,000,000 | |||||||
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Equity [Member] | Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 1,482,000,000 | 1,649,000,000 | 2,028,000,000 | |||||||
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Equity [Member] | Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 2,333,000,000 | [1],[2] | 2,435,000,000 | [1],[2] | 2,325,000,000 | [1],[2] | ||||
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Equity [Member] | Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 128,000,000 | 17,000,000 | 237,000,000 | |||||||
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Credit [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 4,256,000,000 | 8,420,000,000 | 5,899,000,000 | |||||||
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Credit [Member] | Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 1,102,000,000 | 4,599,000,000 | 4,282,000,000 | |||||||
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Credit [Member] | Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 550,000,000 | [1],[2] | 264,000,000 | [1],[2] | (2,725,000,000) | [1],[2] | ||||
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Credit [Member] | Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 2,604,000,000 | 3,557,000,000 | 4,342,000,000 | |||||||
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Other Trading [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 378,000,000 | 272,000,000 | 668,000,000 | |||||||
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Other Trading [Member] | Trading Account Profits (Losses) [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | 634,000,000 | 447,000,000 | 1,174,000,000 | |||||||
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Other Trading [Member] | Other Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | (72,000,000) | [1],[2] | (4,000,000) | [1],[2] | 24,000,000 | [1],[2] | ||||
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Other Trading [Member] | Net Interest Income [Member]
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| Sales and Trading Revenue [Abstract] | ||||||||||
| Trading Activity, Gains and Losses, Net | $ (184,000,000) | $ (171,000,000) | $ (530,000,000) | |||||||
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