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Securities Available for Sale Textuals (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Cost | $ 244,368,000,000 | $ 244,368,000,000 | $ 223,283,000,000 | ||
| Fair value | 249,439,000,000 | 249,439,000,000 | 235,199,000,000 | ||
| Gross unrealized losses | 3,827,000,000 | 3,827,000,000 | 1,054,000,000 | ||
| OTTI | 76,000,000 | 82,000,000 | 114,000,000 | 133,000,000 | |
| Expected remaining life of loan losses From | 1.00% | 1.00% | 1.00% | 1.00% | |
| Expected remaining life of loan losses To | 20.00% | 37.00% | 20.00% | 44.00% | |
| Current subordination levels From | 0.00% | 0.00% | 0.00% | 0.00% | |
| Current subordination levels To | 5.00% | 22.00% | 41.00% | 57.00% | |
| Held-to-maturity Securities | 0 | 0 | 0 | ||
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Collateralized debt obligations [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Cost | 551,000,000 | 551,000,000 | 556,000,000 | ||
| Fair value | 705,000,000 | 705,000,000 | 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 | 4,800,000,000 | 4,800,000,000 | 5,900,000,000 | ||
| Fair value | 4,900,000,000 | 4,900,000,000 | 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 | 611,000,000 | 611,000,000 | 695,000,000 | ||
| Fair value | 857,000,000 | 857,000,000 | 918,000,000 | ||
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Mortgage Backed Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Cost | 141,379,000,000 | 141,379,000,000 | 125,471,000,000 | ||
| Fair value | 143,984,000,000 | 143,984,000,000 | 133,184,000,000 | ||
| Gross unrealized losses | 2,435,000,000 | 2,435,000,000 | 321,000,000 | ||
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Federal agencies [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Cost | 110,522,000,000 | 110,522,000,000 | 92,855,000,000 | ||
| Fair value | 110,561,000,000 | 110,561,000,000 | 97,285,000,000 | ||
| Gross unrealized losses | 2,192,000,000 | 2,192,000,000 | 4,000,000 | ||
| OTTI | 1,000,000 | 0 | 1,000,000 | 0 | |
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Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Cost | 18,153,000,000 | 18,153,000,000 | 18,438,000,000 | ||
| Fair value | 19,306,000,000 | 19,306,000,000 | 19,968,000,000 | ||
| Gross unrealized losses | 178,000,000 | 178,000,000 | 268,000,000 | ||
| OTTI | 26,000,000 | 3,000,000 | 41,000,000 | 33,000,000 | |
| Expected remaining life of loan losses From | 4.00% | 5.00% | 4.00% | 5.00% | |
| Expected remaining life of loan losses To | 13.00% | 17.00% | 14.00% | 17.00% | |
| Current subordination levels From | 0.00% | 1.00% | 0.00% | 0.00% | |
| Current subordination levels To | 15.00% | 12.00% | 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 | 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 | 9,000,000 | 4,000,000 | 15,000,000 | 34,000,000 | |
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Investment Grade [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Fair value | 87,992,000,000 | 87,992,000,000 | 18,139,000,000 | ||
| Gross unrealized losses | 3,483,000,000 | 3,483,000,000 | 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 | 57,576,000,000 | 57,576,000,000 | 4,435,000,000 | ||
| Gross unrealized losses | 2,259,000,000 | 2,259,000,000 | 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 | 53,578,000,000 | 53,578,000,000 | 2,247,000,000 | ||
| Gross unrealized losses | 2,192,000,000 | 2,192,000,000 | 4,000,000 | ||
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Investment Grade [Member] | Commercial [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Fair value | 3,732,000,000 | 3,732,000,000 | 2,110,000,000 | ||
| Gross unrealized losses | 61,000,000 | 61,000,000 | 31,000,000 | ||
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Unrated Investment Grade Securities [Member]
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| Securities Available For Sale (Textual) [Abstract] | |||||
| Fair value | 2,900,000,000 | 2,900,000,000 | 2,000,000,000 | ||
| Gross unrealized losses | $ 27,000,000 | $ 27,000,000 | $ 19,000,000 | ||