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Fair Values of Assets and Liabilities Textuals (Details) (USD $)
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3 Months Ended | 3 Months Ended | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2011
Level 1 [Member]
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Mar. 31, 2011
Level 2 [Member]
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Mar. 31, 2011
Level 3 [Member]
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Mar. 31, 2012
Private Equity Funds [Member]
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Mar. 31, 2012
Venture Capital Funds [Member]
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Mar. 31, 2012
Offshore Funds [Member]
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Dec. 31, 2011
Offshore Funds [Member]
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Mar. 31, 2012
Finance Leases Financing Receivable [Member]
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Dec. 31, 2011
Finance Leases Financing Receivable [Member]
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Mar. 31, 2012
Non modified loans [Member]
Maximum [Member]
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Mar. 31, 2012
Non modified loans [Member]
Minimum [Member]
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Mar. 31, 2012
Residential Portfolio Segment [Member]
Government Insured Or Guaranteed [Member]
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Mar. 31, 2012
Residential Portfolio Segment [Member]
Non Government Insured Or Guaranteed [Member]
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Mar. 31, 2012
Collateralized loan obligations [Member]
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Dec. 31, 2011
Collateralized loan obligations [Member]
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Mar. 31, 2012
Carrying amount [Member]
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Dec. 31, 2011
Carrying amount [Member]
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Mar. 31, 2012
Estimated fair value [Member]
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Dec. 31, 2011
Estimated fair value [Member]
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Mar. 31, 2012
Estimated fair value [Member]
Level 1 [Member]
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Mar. 31, 2012
Estimated fair value [Member]
Level 2 [Member]
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Mar. 31, 2012
Estimated fair value [Member]
Level 3 [Member]
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| Fair Values of Assets and Liabilities (Textual) [Abstract] | ||||||||||||||||||||||||
| Total trading assets (excluding derivatives) | $ 587,000,000 | $ 583,000,000 | ||||||||||||||||||||||
| Securities available for sale | 230,266,000,000 | 222,613,000,000 | 8,600,000,000 | 8,100,000,000 | ||||||||||||||||||||
| Significant Transfers In, Amount | 0 | 0 | 0 | |||||||||||||||||||||
| Significant Transfers Out, Amount | 0 | 0 | 0 | |||||||||||||||||||||
| Trading and available for sale securities | 9,200,000,000 | |||||||||||||||||||||||
| Cost to service per loan | 469 | 82 | ||||||||||||||||||||||
| Mortgages held for sale | 39,183,000,000 | 44,791,000,000 | 1,100,000,000 | 112,000,000 | ||||||||||||||||||||
| Redemption restriction for investment | 208,000,000 | 200,000,000 | ||||||||||||||||||||||
| Liquidation period | 9y | 6y | ||||||||||||||||||||||
| Loans | 766,521,000,000 | 769,631,000,000 | 13,143,000,000 | 13,117,000,000 | 728,575,000,000 | 731,308,000,000 | 726,391,000,000 | 723,867,000,000 | 0 | 54,386,000,000 | 672,005,000,000 | |||||||||||||
| Capital Lease Obligation | 103,000,000 | 116,000,000 | ||||||||||||||||||||||
| Loan Commitments And Standby, Commercial And Similar Letters of Credit | $ 389,000,000 | $ 495,000,000 | $ 389,000,000 | $ 495,000,000 | ||||||||||||||||||||