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Securities - OTTI and Loss (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] | ||||||||||
| Balance, beginning of period | $ 185 | $ 244 | $ 184 | $ 243 | ||||||
| Additions for credit losses recognized on AFS debt securities that had no previous impairment losses | 10 | 0 | 10 | 5 | ||||||
| Additions for credit losses recognized on AFS debt securities that had previously incurred impairment losses | 0 | 4 | 1 | 8 | ||||||
| Reductions for AFS debt securities matured, sold or intended to be sold | 0 | (43) | 0 | (51) | ||||||
| Balance, end of period | 195 | 205 | 195 | 205 | ||||||
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Residential Mortgage Backed Securities [Member]
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| Other than Temporary Impairment Losses, Investments, Held-to-maturity Securities [Abstract] | ||||||||||
| Total OTTI losses (unrealized and realized) | (12) | (5) | (13) | (14) | ||||||
| Unrealized OTTI losses recognized in OCI | 2 | 1 | 2 | 1 | ||||||
| Net impairment losses recognized in earnings | $ (10) | $ (4) | $ (11) | $ (13) | ||||||
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Residential Mortgage Backed Securities [Member] | Weighted average [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Annual prepayment speed | 14.30% | 14.30% | ||||||||
| Loss severity | 42.00% | 42.00% | ||||||||
| Life default rate | 42.90% | 42.90% | ||||||||
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Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Prime Loan [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Loss severity | 36.90% | 36.90% | ||||||||
| Life default rate | 29.90% | 29.90% | ||||||||
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Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Alt-A Loan [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Loss severity | 38.80% | 38.80% | ||||||||
| Life default rate | 44.20% | 44.20% | ||||||||
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Residential Mortgage Backed Securities [Member] | Weighted average [Member] | Subprime Loan [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Loss severity | 50.20% | 50.20% | ||||||||
| Life default rate | 47.70% | 47.70% | ||||||||
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Residential Mortgage Backed Securities [Member] | Tenth Percentile [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Annual prepayment speed | 3.60% | [1],[2] | 3.60% | [1],[2] | ||||||
| Loss severity | 13.40% | [1],[2] | 13.40% | [1],[2] | ||||||
| Life default rate | 1.50% | [1],[2] | 1.50% | [1],[2] | ||||||
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Residential Mortgage Backed Securities [Member] | Ninetieth Percentile [Member]
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| Valuation Of Non Agency Residential Mortgage Backed Securities [Abstract] | ||||||||||
| Annual prepayment speed | 26.40% | [1],[2] | 26.40% | [1],[2] | ||||||
| Loss severity | 53.90% | [1],[2] | 53.90% | [1],[2] | ||||||
| Life default rate | 99.60% | [1],[2] | 99.60% | [1],[2] | ||||||
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