This element represents the sum of the carrying values of FHLB and FRB stock.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The total preferred stock shares transferred by the company and distributed to LTIP participants to partially fund a portion of the company's obligation.

+ References

No definition available.

+ Details

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- Definition

Represents percentage of the securities portfolio priced using pricing services provided by third-party vendors.

+ References

No definition available.

+ Details

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- Definition

Represent the transfer in of assets between classifications within Level 3.

+ References

No definition available.

+ Details

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- Definition

Represent the transfer out of assets between classifications within Level 3.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

+ Details

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Balance held at close of period in number of shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

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-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column B

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+ Details

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Period Type:	instant

- Definition

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

+ References

No definition available.

+ Details

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- Details

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- Details

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Fair Value (Narrative) (Details) (USD $)	12 Months Ended
Fair Value (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2013	Dec. 31, 2011
Carrying value of FHLB and FRB stock	$ 1,800,000,000	$ 1,600,000,000
BlackRock Series C Preferred Stock
LTIP - Number of preferred stock shares transferred			200,000	1,300,000
LTIP - Total preferred shares held at end of period	1,300,000
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Recurring Liabilities - Fair Value	716,000,000	638,000,000
Transfers Into Level 3	144,000,000	305,000,000
Transfers out of Level 3 - Assets	144,000,000	126,000,000
Transfer into Level 3 - Liabilities		15,000,000
Available For Sale Securities And Trading Securities [Member]
Percentage of securities priced by using pricing services provided by third-party vendors	78.00%
Trading Securities - Debt [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Transfers Into Level 3	29,000,000
Financial Derivatives [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Transfers out of Level 3 - Assets		2,000,000
Financial Derivatives [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Visa Class B Swap [Member]
Recurring Liabilities - Fair Value	135,000,000	90,000,000
Loans - Portfolio [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Transfers Into Level 3	20,000,000	292,000,000
Transfers out of Level 3 - Assets	105,000,000	28,000,000
Transfers between level 3 (In)	20,000,000	84,000,000
Loans - Portfolio [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Reduced Market Activity [Member]
Transfers Into Level 3		29,000,000
Loans - Portfolio [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Transfer to OREO [Member]
Transfers out of Level 3 - Assets	105,000,000	28,000,000
Loans - Portfolio [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Unobservable nature of pool level pricing methodology
Transfers Into Level 3		164,000,000
Available-for-sale Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Transfers Into Level 3	77,000,000
Transfers out of Level 3 - Assets	14,000,000
Available-for-sale Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Residential Mortgages [Member] \| Mortgage-backed Securities Non-agency [Member]
Transfers Into Level 3	77,000,000
Available-for-sale Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| State and Municipal [Member]
Transfers out of Level 3 - Assets	14,000,000
Loans Held For Sale [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Residential Mortgages [Member]
Transfers Into Level 3	11,000,000	13,000,000
Transfers out of Level 3 - Assets	25,000,000	96,000,000
Transfers between level 3 (Out)	20,000,000	84,000,000
Loans Held For Sale [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Residential Mortgages [Member] \| Reduced Market Activity [Member]
Transfers Into Level 3	11,000,000	13,000,000
Loans Held For Sale [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member] \| Residential Mortgages [Member] \| Transfer to OREO [Member]
Transfers out of Level 3 - Assets	5,000,000	12,000,000
Other Borrowed Funds [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Transfer into Level 3 - Liabilities		$ 15,000,000
Held To Maturity [Member]
Percentage of securities priced by using pricing services provided by third-party vendors	94.00%