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Securities Available for Sale and Securities Held to Maturity - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |||||||
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Mar. 31, 2013
CreditScore
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Mar. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||
| Securities available for sale Gross Unrealized Losses | $ 52 | $ 73 | ||||||
| Fair Isaac & Company minimum credit score for Prime loan origination | 620 | |||||||
| Securities available for sale Amortized Cost | 48,329 | 45,644 | ||||||
| Securities available for sale | 48,809 | 46,123 | ||||||
| Cash and cash equivalents | 6,931 | 6,794 | 12,663 | 8,679 | ||||
| Loan-to-deposit ratio | 14.00% | |||||||
| Net impairment losses on securities | 4 | [1] | 18 | [1] | ||||
| Proceeds from sale of available for sale securities | 250 | |||||||
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Alt-A residential mortgage backed securities
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| Schedule of Available-for-sale Securities [Line Items] | ||||||||
| Securities available for sale Amortized Cost | 295 | |||||||
| Securities available for sale | $ 269 | |||||||
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| X | ||||||||||
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- Definition
Loan To Deposit Ratio No definition available.
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| X | ||||||||||
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- Definition
Minimum Fair Issac & Company credit score required of a borrower at the time a loan is originated to be considered "Prime". Pertains to the non-agency residential mortgage-backed securities collateralized by loans that are considered to be "Prime". No definition available.
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| X | ||||||||||
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- Definition
Net other-than-temporary-impairments (credit related losses) recognized in earnings. No definition available.
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| X | ||||||||||
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. No definition available.
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| X | ||||||||||
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- Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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