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Stockholders' Equity - Additional Information (Detail) - Jun. 30, 2015 - USD ($)	Total
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%
After 2015 [Member]
Stockholders Equity [Line Items]
Implementation of the deductions and other adjustments to CET1, Additional Percentage	20.00%
2016 [Member]
Stockholders Equity [Line Items]
Implementation of the capital conservation buffer, Percentage	0.625%
Capital conservation buffer implementation phase-out period	4 years
2019 [Member]
Stockholders Equity [Line Items]
Capital Conservation Buffer Maximum Level	2.50%
Maximum [Member]
Stockholders Equity [Line Items]
Quantitative limit for trust preferred securities to be included in tier 1 capital	$ 15,000,000,000

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- Definition

Implementation of deductions and other adjustments to CET one.

+ References

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- Definition

Implementation of deductions and other adjustments to CET one additional percentage.

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- Definition

Implementation of deductions and other adjustments to CET one percentage.

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- Definition

Quantitative limit for trust preferred securities to be included in tier one capital.

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- Definition

Stockholders equity.

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- Definition

Tier one capital conservation buffer maximum level.

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- Definition

Tier one capital conservation buffer to risk weighted assets required under regulatory.

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- Definition

Tier one risk based capital conservation buffer initial requirements phasing duration.

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