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Securities Available for Sale Textuals (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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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | $ 223,283,000,000 | $ 215,571,000,000 | |
| Fair value | 235,199,000,000 | 222,613,000,000 | |
| Gross unrealized losses | 1,054,000,000 | 3,169,000,000 | |
| OTTI | 256,000,000 | 541,000,000 | 692,000,000 |
| Securities of a single issuer (excluding the U.S. Treasury and federal agencies) with a book value exceeding 10% of stockholders' equity | 0 | 0 | |
| Held-to-maturity Securities | 0 | 0 | |
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Collateralized loan obligations [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 12,200,000,000 | 8,100,000,000 | |
| Fair value | 12,500,000,000 | 8,100,000,000 | |
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Asset-backed Securities Collateralized by Auto Leases or Loans and Cash Reserves [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 5,900,000,000 | 6,700,000,000 | |
| Fair value | 5,900,000,000 | 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 | 695,000,000 | 846,000,000 | |
| Fair value | 918,000,000 | 932,000,000 | |
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Mortgage Backed Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 125,471,000,000 | 127,105,000,000 | |
| Fair value | 133,184,000,000 | 132,740,000,000 | |
| Gross unrealized losses | 321,000,000 | 1,352,000,000 | |
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Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 92,855,000,000 | 92,279,000,000 | |
| Fair value | 97,285,000,000 | 96,754,000,000 | |
| Gross unrealized losses | 4,000,000 | 10,000,000 | |
| OTTI | 0 | 0 | 267,000,000 |
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Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 18,438,000,000 | 17,829,000,000 | |
| Fair value | 19,968,000,000 | 18,150,000,000 | |
| Gross unrealized losses | 268,000,000 | 928,000,000 | |
| OTTI | 86,000,000 | 101,000,000 | 120,000,000 |
| Expected remaining life of loan losses From | 3.00% | 4.00% | 2.00% |
| Expected remaining life of loan losses To | 18.00% | 18.00% | 15.00% |
| Current subordination levels From | 0.00% | 3.00% | 3.00% |
| Current subordination levels To | 13.00% | 15.00% | 13.00% |
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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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Securities we Intend to Sell [Member] | Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 14,500,000,000 | ||
| OTTI | 252,000,000 | ||
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Securities we do not Intend to Sell [Member] | Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| OTTI | 86,000,000 | 101,000,000 | 120,000,000 |
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Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 18,139,000,000 | 45,405,000,000 | |
| Gross unrealized losses | 573,000,000 | 1,859,000,000 | |
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Investment Grade [Member] | Mortgage Backed Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 4,435,000,000 | 11,795,000,000 | |
| Gross unrealized losses | 38,000,000 | 478,000,000 | |
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Investment Grade [Member] | Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 2,247,000,000 | 3,019,000,000 | |
| Gross unrealized losses | 4,000,000 | 10,000,000 | |
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Investment Grade [Member] | Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 2,110,000,000 | 6,273,000,000 | |
| Gross unrealized losses | 31,000,000 | 429,000,000 | |
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Unrated Investment Grade Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 2,000,000,000 | 6,200,000,000 | |
| Gross unrealized losses | $ 19,000,000 | $ 207,000,000 | |