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Securities Available for Sale Textuals (Details) (USD $)
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3 Months Ended | ||
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | $ 236,990,000,000 | $ 223,283,000,000 | |
| Fair value | 248,160,000,000 | 235,199,000,000 | |
| Gross unrealized losses | 1,052,000,000 | 1,054,000,000 | |
| OTTI | 38,000,000 | 51,000,000 | |
| Held-to-maturity Securities | 0 | 0 | |
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Collateralized debt obligations [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 543,000,000 | 556,000,000 | |
| Fair value | 674,000,000 | 644,000,000 | |
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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 | 5,600,000,000 | 5,900,000,000 | |
| Fair value | 5,700,000,000 | 5,900,000,000 | |
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Asset-backed Securities Collateralized by Home Equity Loans [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 626,000,000 | 695,000,000 | |
| Fair value | 853,000,000 | 918,000,000 | |
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Mortgage Backed Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 133,840,000,000 | 125,471,000,000 | |
| Fair value | 140,651,000,000 | 133,184,000,000 | |
| Gross unrealized losses | 408,000,000 | 321,000,000 | |
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Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 101,876,000,000 | 92,855,000,000 | |
| Fair value | 105,472,000,000 | 97,285,000,000 | |
| Gross unrealized losses | 171,000,000 | 4,000,000 | |
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Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Cost | 18,492,000,000 | 18,438,000,000 | |
| Fair value | 19,920,000,000 | 19,968,000,000 | |
| Gross unrealized losses | 195,000,000 | 268,000,000 | |
| OTTI | 15,000,000 | 30,000,000 | |
| Expected remaining life of loan losses From | 4.00% | 5.00% | |
| Expected remaining life of loan losses To | 14.00% | 14.00% | |
| Current subordination levels From | 0.00% | 0.00% | |
| Current subordination levels To | 21.00% | 12.00% | |
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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 do not Intend to Sell [Member] | Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| OTTI | 6,000,000 | 30,000,000 | |
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Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 43,909,000,000 | 18,139,000,000 | |
| Gross unrealized losses | 697,000,000 | 573,000,000 | |
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Investment Grade [Member] | Mortgage Backed Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 23,166,000,000 | 4,435,000,000 | |
| Gross unrealized losses | 209,000,000 | 38,000,000 | |
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Investment Grade [Member] | Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 20,109,000,000 | 2,247,000,000 | |
| Gross unrealized losses | 171,000,000 | 4,000,000 | |
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Investment Grade [Member] | Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 2,993,000,000 | 2,110,000,000 | |
| Gross unrealized losses | 35,000,000 | 31,000,000 | |
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Unrated Investment Grade Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||
| Fair value | 2,500,000,000 | 2,000,000,000 | |
| Gross unrealized losses | $ 22,000,000 | $ 19,000,000 | |