| **Summary of Significant Accounting Policies (Life Settlement Contracts) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2011 |
|-------------------------------------------------------------------------------------------------------------------------------------|---------------|
| Number of life settlement contracts                                                                                                 | 841           |
| Fair value of life settlement contracts                                                                                             | $ 117         |
| Face amount of life insurance policies                                                                                              | 535           |
| One Year from Balance Sheet Date [Member]                                                                                           |          |
| Number of life settlement contracts                                                                                                 | 70            |
| Fair value of life settlement contracts                                                                                             | 16            |
| Face amount of life insurance policies                                                                                              | 46            |
| More than One and within Two Years from Balance Sheet Date [Member]                                                                 |          |
| Number of life settlement contracts                                                                                                 | 70            |
| Fair value of life settlement contracts                                                                                             | 14            |
| Face amount of life insurance policies                                                                                              | 42            |
| More than Two and within Three Years from Balance Sheet Date [Member]                                                               |          |
| Number of life settlement contracts                                                                                                 | 60            |
| Fair value of life settlement contracts                                                                                             | 12            |
| Face amount of life insurance policies                                                                                              | 39            |
| More than Three and within Four Years from Balance Sheet Date [Member]                                                              |          |
| Number of life settlement contracts                                                                                                 | 60            |
| Fair value of life settlement contracts                                                                                             | 10            |
| Face amount of life insurance policies                                                                                              | 37            |
| More than Four and within Five Years from Balance Sheet Date [Member]                                                               |          |
| Number of life settlement contracts                                                                                                 | 50            |
| Fair value of life settlement contracts                                                                                             | 9             |
| Face amount of life insurance policies                                                                                              | 33            |
| More than Five Years from Balance Sheet Date and Thereafter [Member]                                                                |          |
| Number of life settlement contracts                                                                                                 | 531           |
| Fair value of life settlement contracts                                                                                             | 56            |
| Face amount of life insurance policies                                                                                              | $ 338         |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The carrying value of life settlement contracts accounted for under the fair value method based on remaining life expectancy.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FTB85-4-1 -Paragraph 17 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Life Settlement Contract -URI http://asc.fasb.org/extlink&oid=6516907Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6385267&loc=d3e42732-111610
+ Details**Name:**us-gaap_LifeSettlementContractsFairValueMethodCarryingAmount**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The face value (death benefits) of the life insurance policies underlying the life settlement contracts accounted for under the fair value method based on remaining life expectancy.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FTB85-4-1 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Life Settlement Contract -URI http://asc.fasb.org/extlink&oid=6516907Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6385267&loc=d3e42732-111610
+ Details**Name:**us-gaap_LifeSettlementContractsFairValueMethodFaceValue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of life settlement contracts accounted for under the fair value method based on remaining life expectancy.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FTB85-4-1 -Paragraph 17 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Life Settlement Contract -URI http://asc.fasb.org/extlink&oid=6516907Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6385267&loc=d3e42732-111610
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