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Federal Funds Sold, Securities Borrowed or Purchased Under Agreements to Resell and Short-term Borrowings (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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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | $ 35,698,000,000 | $ 59,962,000,000 | |
| Federal Funds Sold Securities Borrowed or Purchased Under Agreements to Resell and Short term Borrowings Textuals [Abstract] | |||
| Short Term Bank Notes Outstanding | 1,400,000,000 | 14,600,000,000 | |
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Federal Funds Sold and Securities Borrowed or Purchased under Agreements to Resell [Member]
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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | 211,183,000,000 | 209,616,000,000 | 189,933,000,000 |
| Rate at December 31 | 0.76% | 0.85% | 0.78% |
| Average Amount During Year | 245,069,000,000 | 256,943,000,000 | 235,764,000,000 |
| Average Rate During Year | 0.88% | 0.71% | 1.23% |
| Maximum Month-end Balance During Year | 270,473,000,000 | 314,932,000,000 | 271,321,000,000 |
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Federal Funds Purchased [Member]
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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | 243,000,000 | 1,458,000,000 | 4,814,000,000 |
| Rate at December 31 | 0.06% | 0.14% | 0.09% |
| Average Amount During Year | 1,658,000,000 | 4,718,000,000 | 4,239,000,000 |
| Average Rate During Year | 0.08% | 0.15% | 0.05% |
| Maximum Month-end Balance During Year | 4,133,000,000 | 8,320,000,000 | 4,814,000,000 |
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Securities Sold under Agreements to Repurchase [Member]
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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | 214,621,000,000 | 243,901,000,000 | 250,371,000,000 |
| Rate at December 31 | 1.08% | 1.15% | 0.39% |
| Average Amount During Year | 270,718,000,000 | 348,936,000,000 | 365,624,000,000 |
| Average Rate During Year | 1.31% | 0.74% | 0.96% |
| Maximum Month-end Balance During Year | 293,519,000,000 | 458,532,000,000 | 407,967,000,000 |
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Commercial Paper [Member]
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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | 23,000,000 | 15,093,000,000 | 13,131,000,000 |
| Rate at December 31 | 1.70% | 0.65% | 0.65% |
| Average Amount During Year | 8,897,000,000 | 25,923,000,000 | 26,697,000,000 |
| Average Rate During Year | 0.53% | 0.56% | 1.03% |
| Maximum Month-end Balance During Year | 21,212,000,000 | 36,236,000,000 | 37,025,000,000 |
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Other Short-term Borrowings [Member]
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| Short-term Debt [Abstract] | |||
| Commercial paper and other short-term borrowings | 35,675,000,000 | 44,869,000,000 | 56,393,000,000 |
| Rate at December 31 | 2.35% | 2.02% | 1.72% |
| Average Amount During Year | 42,996,000,000 | 50,752,000,000 | 92,084,000,000 |
| Average Rate During Year | 2.31% | 1.88% | 1.87% |
| Maximum Month-end Balance During Year | 47,087,000,000 | 63,081,000,000 | 169,602,000,000 |
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Parent Company And Other Subsidiaries Member [Member]
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| Federal Funds Sold Securities Borrowed or Purchased Under Agreements to Resell and Short term Borrowings Textuals [Abstract] | |||
| Maximum Of Bank Notes Outstanding With Fixed Or Floating Rate | $ 75,000,000,000 | ||