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Securities Available for Sale Textuals (Details) (USD $)
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3 Months Ended | ||
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Mar. 31, 2012
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Mar. 31, 2011
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Dec. 31, 2011
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | $ 221,575,000,000 | $ 215,571,000,000 | |
| Fair value | 230,266,000,000 | 222,613,000,000 | |
| Gross unrealized losses | 1,964,000,000 | 3,169,000,000 | |
| OTTI | 51,000,000 | 80,000,000 | |
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Securities we Intend to Sell [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 0 | 0 | |
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Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 34,485,000,000 | 45,405,000,000 | |
| Gross unrealized losses | 1,017,000,000 | 1,859,000,000 | |
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Unrated Investment Grade Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 1,800,000,000 | 6,200,000,000 | |
| Gross unrealized losses | 128,000,000 | 207,000,000 | |
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Non-investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 6,207,000,000 | 8,147,000,000 | |
| Gross unrealized losses | 946,000,000 | 1,301,000,000 | |
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Collateralized loan obligations [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 8,500,000,000 | 8,100,000,000 | |
| Fair value | 8,600,000,000 | 8,100,000,000 | |
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Residential [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 16,491,000,000 | 16,997,000,000 | |
| Fair value | 17,829,000,000 | 17,836,000,000 | |
| Gross unrealized losses | 244,000,000 | 414,000,000 | |
| OTTI | 14,000,000 | 62,000,000 | |
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Residential [Member] | Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 963,000,000 | 2,503,000,000 | |
| Gross unrealized losses | 7,000,000 | 39,000,000 | |
| OTTI | 0 | 5,000,000 | |
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Residential [Member] | Non-investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 3,573,000,000 | 4,717,000,000 | |
| Gross unrealized losses | 237,000,000 | 375,000,000 | |
| OTTI | 14,000,000 | 57,000,000 | |
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Asset-backed Securities Collateralized by Auto Leases [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 6,900,000,000 | 6,700,000,000 | |
| Fair value | 7,000,000,000 | 6,700,000,000 | |
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Asset-backed Securities Collateralized by Home Equity Loans [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 829,000,000 | 846,000,000 | |
| Fair value | 955,000,000 | 932,000,000 | |
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Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 98,409,000,000 | 92,279,000,000 | |
| Fair value | 102,665,000,000 | 96,754,000,000 | |
| Gross unrealized losses | 37,000,000 | 10,000,000 | |
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Federal agencies [Member] | Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 10,382,000,000 | 3,019,000,000 | |
| Gross unrealized losses | 37,000,000 | 10,000,000 | |
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Federal agencies [Member] | Non-investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 0 | 0 | |
| Gross unrealized losses | $ 0 | $ 0 | |