Financing Receivables Financing Receivables (Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2014 item	Jun. 30, 2013 item	Jun. 30, 2014 item	Jun. 30, 2013 item
Troubled Debt Restructurings
Financing Receivable, Modifications, Number of Contracts	2	3	5	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 9,000,000	$ 8,000,000	$ 9,000,000
Commitments to lend additional funds to borrowers for restructured loans	0	0	0	0
Commercial Mortgage Loans
Troubled Debt Restructurings
Financing Receivable, Modifications, Number of Contracts		3	2	3
Financing Receivable, Modifications, Post-Modification Recorded Investment		$ 9,000,000	$ 8,000,000	$ 9,000,000
Residential Mortgage Loans
Troubled Debt Restructurings
Financing Receivable, Modifications, Number of Contracts	2		2	2
Syndicated Loans
Troubled Debt Restructurings
Financing Receivable, Modifications, Number of Contracts			1

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

+ Details

Name:	us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant