Trust preferred securities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Debt Disclosure [Line Items]
Maximum Percentage Of Restricted Core Capital To All Core Capital That May Be Included In Tier One Capital	25.00%
Trust Preferred Securities Subject To Phase Out Provision Of Dodd Frank Act	$ 427
Percent Of Non Qualifying Capital Instruments Allowed For Tier I Capital In 2015	25.00%
Percent Of Non Qualifying Capital Instruments Allowed For Tier I Capital In 2016	0.00%
Amount Of Trust Preferred Securities That Exceeds Core Capital Elements Limitation	$ 0

- Definition

Amount of outstanding trust preferred securities that exceeded the core capital elements limitation of 25% and as such are included as Tier 2 capital.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of restrictive core capital to all core capital that may be included in Tier One capital.

+ References

No definition available.

+ Details

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- Definition

Percent of Non Qualifying Capital Instruments Allowed for Tier I Capital as of January 1, 2015

+ References

No definition available.

+ Details

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- Definition

Percent of Non Qualifying Capital Instruments Allowed for Tier I Capital as of January 1, 2016

+ References

No definition available.

+ Details

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- Definition

Amount of trust preferred securities subject to phase out provision of Dodd Frank Act.

+ References

No definition available.

+ Details

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