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Risk Management and Derivatives (Risk Concentration) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) borrower
Commercial Office Real Estate
Concentration Risk [Line Items]
Concentration risk, percentage	22.50%
Land
Concentration Risk [Line Items]
Concentration risk, percentage	22.70%
Mixed Use Collateral
Concentration Risk [Line Items]
Concentration risk, percentage	15.80%
Hotel
Concentration Risk [Line Items]
Concentration risk, percentage	10.60%
CALIFORNIA
Concentration Risk [Line Items]
Concentration risk, percentage	13.60%
NEW YORK
Concentration Risk [Line Items]
Concentration risk, percentage	19.90%
Geographic Concentration Risk
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Customer Concentration Risk
Concentration Risk [Line Items]
Number of large borrowers or tenants | borrower	5
Large borrowers or tenants revenue | $	$ 118
Concentration risk percentage of revenue (no more than)	6.00%

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- Definition

Represents the number of large borrowers considered for evaluating concentration risk.

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Concentration Risk Percentage of Revenue Accounted by Large Borrowers or Tenants

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Revenue Accounted by Large Borrowers or Tenants

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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