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Stockholders' Equity - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Stockholders Equity [Line Items]
Minimum Tier 1 Ratio to be well capitalized	6.00%
Minimum combined Tier 1 and Tier 2 Ratio to be well capitalized	10.00%
Minimum Leverage Ratio to be well capitalized	5.00%
2015 [Member]
Stockholders Equity [Line Items]
Implementation of the deductions and other adjustments to CET1	4 years
Implementation of the deductions and other adjustments to CET1, Percentage	40.00%
2016 [Member]
Stockholders Equity [Line Items]
Implementation of the capital conservation buffer, Percentage	0.625%
Capital conservation buffer implementation phaseout period	4 years
2019 [Member]
Stockholders Equity [Line Items]
Capital Conservation Buffer Maximum Level	2.50%
After 2015 [Member]
Stockholders Equity [Line Items]
Implementation of the deductions and other adjustments to CET1, Additional Percentage	20.00%
Maximum [Member]
Stockholders Equity [Line Items]
Quantitative limit for trust preferred securities to be included in tier 1 capital	$ 10
Minimum [Member] | 2015 [Member]
Stockholders Equity [Line Items]
Minimum ratio of CET1 to risk-weighted assets	4.50%
Tier 1 capital to risk-weighted assets	6.00%
Total capital to risk weighted assets	8.00%
Minimum leverage ratio	4.00%

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Common Equity Tier One Risk Based Capital To Risk Weighted Assets

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Implementation Of Deductions And Other Adjustments To Cet One Percentage

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Quantitative Limit For Trust Preferred Securities To Be Included In Tier One Capital

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Tier One Capital Conservation Buffer Maximum Level

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Tier One Capital Conservation Buffer to Risk Weighted Assets Required under Regulatory

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Tier One Risk Based Capital Conservation Buffer Initial Requirements Phasing Duration

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- Definition

Total Capital divided by risk weighted assets as defined in the regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

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