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Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Assets: |  |  |  |
Assets of managed investment entities (MIE) | $ 2,799 |  | $ 2,888 |
Variable annuity assets (separate accounts) | 681 | [1] | 665 | [1]
Other investments — derivatives | 313 |  | 274 |
Total assets accounted for at fair value | 34,597 |  | 31,767 |
Liabilities: |  |  |  |
Liabilities of managed investment entities | 2,499 |  | 2,567 |
Total liabilities accounted for at fair value | 3,538 |  | 3,381 |
Annuity benefits accumulated [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 1,026 |  | 804 |
Other liabilities [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 13 |  | 10 |
U.S. Government and government agencies [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 349 |  | 314 |
States, municipalities and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 6,228 |  | 5,372 |
Foreign government [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 138 |  | 208 |
Residential Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 4,684 |  | 4,310 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 2,583 |  | 2,724 |
Asset-backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 3,219 |  | 2,493 |
All other corporate [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 11,787 |  | 11,035 |
Fixed maturities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 28,988 |  | 26,456 |
Trading fixed maturities | 343 |  | 305 |
Equity securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 1,473 |  | 1,179 |
Level 1 [Member] |  |  |  |
Assets: |  |  |  |
Assets of managed investment entities (MIE) | 232 |  | 266 |
Variable annuity assets (separate accounts) | 0 | [1] | 0 | [1]
Other investments — derivatives | 0 |  | 0 |
Total assets accounted for at fair value | 1,646 |  | 1,464 |
Liabilities: |  |  |  |
Liabilities of managed investment entities | 177 |  | 156 |
Total liabilities accounted for at fair value | 177 |  | 156 |
Level 1 [Member] | Annuity benefits accumulated [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 0 |  | 0 |
Level 1 [Member] | Other liabilities [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 0 |  | 0 |
Level 1 [Member] | U.S. Government and government agencies [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 168 |  | 147 |
Level 1 [Member] | States, municipalities and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 1 [Member] | Foreign government [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 1 [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 1 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 1 [Member] | All other corporate [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 30 |  | 28 |
Level 1 [Member] | Fixed maturities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 198 |  | 175 |
Trading fixed maturities | 31 |  | 0 |
Level 1 [Member] | Equity securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 1,185 |  | 1,023 |
Level 2 [Member] |  |  |  |
Assets: |  |  |  |
Assets of managed investment entities (MIE) | 2,540 |  | 2,592 |
Variable annuity assets (separate accounts) | 681 | [1] | 665 | [1]
Other investments — derivatives | 313 |  | 274 |
Total assets accounted for at fair value | 31,966 |  | 29,412 |
Liabilities: |  |  |  |
Liabilities of managed investment entities | 0 |  | 0 |
Total liabilities accounted for at fair value | 13 |  | 10 |
Level 2 [Member] | Annuity benefits accumulated [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 0 |  | 0 |
Level 2 [Member] | Other liabilities [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 13 |  | 10 |
Level 2 [Member] | U.S. Government and government agencies [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 166 |  | 152 |
Level 2 [Member] | States, municipalities and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 6,167 |  | 5,311 |
Level 2 [Member] | Foreign government [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 138 |  | 208 |
Level 2 [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 4,428 |  | 3,994 |
Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 2,555 |  | 2,696 |
Level 2 [Member] | Asset-backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 3,015 |  | 2,418 |
Level 2 [Member] | All other corporate [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 11,444 |  | 10,672 |
Level 2 [Member] | Fixed maturities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 27,913 |  | 25,451 |
Trading fixed maturities | 312 |  | 305 |
Level 2 [Member] | Equity securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 207 |  | 125 |
Level 3 [Member] |  |  |  |
Assets: |  |  |  |
Assets of managed investment entities (MIE) | 27 |  | 30 |
Variable annuity assets (separate accounts) | 0 | [1] | 0 | [1]
Other investments — derivatives | 0 |  | 0 |
Total assets accounted for at fair value | 985 |  | 891 |
Liabilities: |  |  |  |
Liabilities of managed investment entities | 2,322 |  | 2,411 |
Total liabilities accounted for at fair value | 3,348 |  | 3,215 |
Level 3 [Member] | Annuity benefits accumulated [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 1,026 |  | 804 |
Level 3 [Member] | Other liabilities [Member] |  |  |  |
Liabilities: |  |  |  |
Derivatives included in annuity benefits accumulated and other liabilities | 0 |  | 0 |
Level 3 [Member] | U.S. Government and government agencies [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 15 |  | 15 |
Level 3 [Member] | States, municipalities and political subdivisions [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 61 |  | 61 |
Level 3 [Member] | Foreign government [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 0 |  | 0 |
Level 3 [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 256 |  | 316 |
Level 3 [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 28 |  | 28 |
Level 3 [Member] | Asset-backed Securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 204 |  | 75 |
Level 3 [Member] | All other corporate [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 313 |  | 335 |
Level 3 [Member] | Fixed maturities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | 877 |  | 830 |
Trading fixed maturities | 0 |  | 0 |
Level 3 [Member] | Equity securities [Member] |  |  |  |
Assets: |  |  |  |
Total AFS securities | $ 81 |  | $ 31 |
[1] | Variable annuity liabilities equal the fair value of variable annuity assets.

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