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Short-term Borrowings (Details) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Short-term Debt [Abstract] | |||
| Short-term borrowings, Amount | $ 57,175,000,000 | $ 49,091,000,000 | $ 55,401,000,000 |
| Short Term Borrowings, Rate | 0.17% | 0.10% | 0.19% |
| Short term Debt average daily balance, Amount | 51,196,000,000 | 51,781,000,000 | 46,824,000,000 |
| Short term Debt average daily balance, Rate | 0.18% | 0.18% | 0.22% |
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Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
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| Short-term Debt [Abstract] | |||
| Short-term borrowings, Amount | 34,973,000,000 | 31,038,000,000 | 37,947,000,000 |
| Short Term Borrowings, Rate | 0.17% | 0.05% | 0.15% |
| Short term Debt average daily balance, Amount | 32,092,000,000 | 34,388,000,000 | 30,494,000,000 |
| Short term Debt average daily balance, Rate | 0.12% | 0.11% | 0.18% |
| Maximum month-end balance, Amount | 36,327,000,000 | 37,509,000,000 | 37,947,000,000 |
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Commercial paper and other short term borrowings [Member]
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| Short-term Debt [Abstract] | |||
| Short-term borrowings, Amount | 22,202,000,000 | 18,053,000,000 | 17,454,000,000 |
| Short Term Borrowings, Rate | 0.18% | 0.19% | 0.26% |
| Short term Debt average daily balance, Amount | 19,104,000,000 | 17,393,000,000 | 16,330,000,000 |
| Short term Debt average daily balance, Rate | 0.28% | 0.33% | 0.31% |
| Maximum month-end balance, Amount | $ 22,202,000,000 | $ 18,234,000,000 | $ 17,646,000,000 |