| **Fair Value (Table of reconciliation for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|
||
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | $ 1,303        | $ 1,393 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 17             | (4) |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 12             | 9 |
| Purchases                                                                                                                                                                                                      | 178            | 465 |
| Sales                                                                                                                                                                                                          | (95)           | (165) |
| Settlements                                                                                                                                                                                                    | (110)          | (65) |
| Transfers into Level 3                                                                                                                                                                                         | 38             | 26 |
| Transfers out of Level 3                                                                                                                                                                                       | (55)           | (59) |
| Balance, Ending, Assets                                                                                                                                                                                        | 1,288          | 1,600 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         | 1              | (16) |
| Fixed maturity securities [Member]                                                                                                                                                                             |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 1,203          | 1,251 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 4              | 4 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 16             | 8 |
| Purchases                                                                                                                                                                                                      | 178            | 465 |
| Sales                                                                                                                                                                                                          | (87)           | (163) |
| Settlements                                                                                                                                                                                                    | (99)           | (53) |
| Transfers into Level 3                                                                                                                                                                                         | 38             | 26 |
| Transfers out of Level 3                                                                                                                                                                                       | (54)           | (58) |
| Balance, Ending, Assets                                                                                                                                                                                        | 1,199          | 1,480 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      | (1) |
| Corporate and other bonds [Member]                                                                                                                                                                             |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 204            | 219 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 1              |    |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 1              | 2 |
| Purchases                                                                                                                                                                                                      | 5              | 110 |
| Sales                                                                                                                                                                                                          | (4)            | (17) |
| Settlements                                                                                                                                                                                                    | (5)            | (20) |
| Transfers into Level 3                                                                                                                                                                                         | 3              | 26 |
| Transfers out of Level 3                                                                                                                                                                                       | (16)           | (18) |
| Balance, Ending, Assets                                                                                                                                                                                        | 189            | 302 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      | (1) |
| States, municipalities and political subdivisions [Member]                                                                                                                                                     |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 71             | 96 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  |      | (3) |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 1              |    |
| Purchases                                                                                                                                                                                                      |      | 85 |
| Sales                                                                                                                                                                                                          |      | (47) |
| Settlements                                                                                                                                                                                                    |      | (2) |
| Transfers into Level 3                                                                                                                                                                                         | 14             |    |
| Transfers out of Level 3                                                                                                                                                                                       |      |    |
| Balance, Ending, Assets                                                                                                                                                                                        | 86             | 129 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |
| Residential mortgage-backed [Member]                                                                                                                                                                           |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 331            | 413 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 1              | 3 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 15             |    |
| Purchases                                                                                                                                                                                                      | 25             | 61 |
| Sales                                                                                                                                                                                                          |      |    |
| Settlements                                                                                                                                                                                                    | (21)           | (11) |
| Transfers into Level 3                                                                                                                                                                                         | 21             |    |
| Transfers out of Level 3                                                                                                                                                                                       | (13)           | (16) |
| Balance, Ending, Assets                                                                                                                                                                                        | 359            | 450 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |
| Commercial Mortgage Backed Securities [Member]                                                                                                                                                                 |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 151            | 129 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 1              | 1 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | (1)            | 5 |
| Purchases                                                                                                                                                                                                      |      | 73 |
| Sales                                                                                                                                                                                                          |      |    |
| Settlements                                                                                                                                                                                                    | (1)            | (7) |
| Transfers into Level 3                                                                                                                                                                                         |      |    |
| Transfers out of Level 3                                                                                                                                                                                       | (24)           | (24) |
| Balance, Ending, Assets                                                                                                                                                                                        | 126            | 177 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |
| Other asset-backed [Member]                                                                                                                                                                                    |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 446            | 368 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 1              | 3 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |      | 1 |
| Purchases                                                                                                                                                                                                      | 148            | 136 |
| Sales                                                                                                                                                                                                          | (83)           | (99) |
| Settlements                                                                                                                                                                                                    | (72)           | (13) |
| Transfers into Level 3                                                                                                                                                                                         |      |    |
| Transfers out of Level 3                                                                                                                                                                                       | (1)            |    |
| Balance, Ending, Assets                                                                                                                                                                                        | 439            | 396 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |
| Total asset-backed [Member]                                                                                                                                                                                    |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 928            | 910 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 3              | 7 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | 14             | 6 |
| Purchases                                                                                                                                                                                                      | 173            | 270 |
| Sales                                                                                                                                                                                                          | (83)           | (99) |
| Settlements                                                                                                                                                                                                    | (94)           | (31) |
| Transfers into Level 3                                                                                                                                                                                         | 21             |    |
| Transfers out of Level 3                                                                                                                                                                                       | (38)           | (40) |
| Balance, Ending, Assets                                                                                                                                                                                        | 924            | 1,023 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |
| Redeemable preferred stock [Member]                                                                                                                                                                            |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     |           | 26 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  |           |    |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |           |    |
| Purchases                                                                                                                                                                                                      |           |    |
| Sales                                                                                                                                                                                                          |           |    |
| Settlements                                                                                                                                                                                                    |           |    |
| Transfers into Level 3                                                                                                                                                                                         |           |    |
| Transfers out of Level 3                                                                                                                                                                                       |           |    |
| Balance, Ending, Assets                                                                                                                                                                                        |           | 26 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |           |    |
| Equity securities [Member]                                                                                                                                                                                     |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 11             | 34 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 3              | (15) |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             | (4)            | 1 |
| Purchases                                                                                                                                                                                                      |      |    |
| Sales                                                                                                                                                                                                          | (8)            |    |
| Settlements                                                                                                                                                                                                    |      |    |
| Transfers into Level 3                                                                                                                                                                                         |      |    |
| Transfers out of Level 3                                                                                                                                                                                       |      | (1) |
| Balance, Ending, Assets                                                                                                                                                                                        | 2              | 19 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      | (15) |
| Other invested assets, including derivatives, net [Member]                                                                                                                                                     |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     |           |    |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  |           |    |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |           |    |
| Purchases                                                                                                                                                                                                      |           |    |
| Sales                                                                                                                                                                                                          |           | (1) |
| Settlements                                                                                                                                                                                                    |           |    |
| Transfers into Level 3                                                                                                                                                                                         |           |    |
| Transfers out of Level 3                                                                                                                                                                                       |           |    |
| Balance, Ending, Assets                                                                                                                                                                                        |           | (1) |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |           |    |
| Short term investments [Member]                                                                                                                                                                                |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     |           | 6 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  |           |    |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |           |    |
| Purchases                                                                                                                                                                                                      |           |    |
| Sales                                                                                                                                                                                                          |           | (1) |
| Settlements                                                                                                                                                                                                    |           |    |
| Transfers into Level 3                                                                                                                                                                                         |           |    |
| Transfers out of Level 3                                                                                                                                                                                       |           |    |
| Balance, Ending, Assets                                                                                                                                                                                        |           | 5 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |           |    |
| Life settlement contracts, included in Other assets [Member]                                                                                                                                                   |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 88             | 100 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  | 10             | 7 |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |      |    |
| Purchases                                                                                                                                                                                                      |      |    |
| Sales                                                                                                                                                                                                          |      |    |
| Settlements                                                                                                                                                                                                    | (11)           | (12) |
| Transfers into Level 3                                                                                                                                                                                         |      |    |
| Transfers out of Level 3                                                                                                                                                                                       |      |    |
| Balance, Ending, Assets                                                                                                                                                                                        | 87             | 95 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         | 1              |    |
| Separate account business [Member]                                                                                                                                                                             |           |   |
| **Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]**                                                                                              |           |   |
| Balance, Beginning, Assets                                                                                                                                                                                     | 1              | 2 |
| Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in net income (loss)                                                                                  |      |    |
| Net change in unrealized appreciation (depreciation) included in other comprehensive income (loss)                                                                                                             |      |    |
| Purchases                                                                                                                                                                                                      |      |    |
| Sales                                                                                                                                                                                                          |      |    |
| Settlements                                                                                                                                                                                                    |      |    |
| Transfers into Level 3                                                                                                                                                                                         |      |    |
| Transfers out of Level 3                                                                                                                                                                                       | (1)            |    |
| Balance, Ending, Assets                                                                                                                                                                                        |      | 2 |
| Unrealized gains (losses) on Level 3 assets and liabilities held at balance sheet date recognized in net income (loss)                                                                                         |      |    |

| X                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Unrealized gains (losses) Recognized in Net Income on Level 3 Assets and Liabilities Held
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ 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)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ 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)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.
+ References
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