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Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | $ 35,394 | $ 32,284
Trading fixed maturities |  | 348 | 254
Assets of managed investment entities (“MIE”) |  | 4,312 | 4,047
Variable annuity assets (separate accounts) | [1] | 606 | 608
Total assets accounted for at fair value |  | 42,760 | 39,155
Liabilities: |  |  |
Liabilities of managed investment entities |  | 4,067 | 3,781
Total liabilities accounted for at fair value |  | 5,762 | 5,156
Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 1,688 | 1,369
Derivatives in long-term debt |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | (6) | (2)
Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 13 | 8
Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 35,394 | 32,284
Trading fixed maturities |  | 348 | 254
U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 332 | 307
States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 7,047 | 6,856
Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 141 | 154
Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 3,816 | 3,529
Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 1,849 | 2,187
Asset-backed securities (“ABS”) |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 5,889 | 4,934
Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 16,320 | 14,317
Equity securities |  |  |
Assets: |  |  |
Equity securities — AFS and trading |  | 1,639 | 1,719
Other assets — derivatives |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 14 | 2
Level 1 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 328 | 309
Variable annuity assets (separate accounts) | [1] | 0 | 0
Total assets accounted for at fair value |  | 1,881 | 1,834
Liabilities: |  |  |
Liabilities of managed investment entities |  | 310 | 289
Total liabilities accounted for at fair value |  | 310 | 289
Level 1 | Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 1 | Derivatives in long-term debt |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 1 | Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 1 | Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 168 | 150
Trading fixed maturities |  | 12 | 13
Level 1 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 133 | 100
Level 1 | States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Asset-backed securities (“ABS”) |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 35 | 50
Level 1 | Equity securities |  |  |
Assets: |  |  |
Equity securities — AFS and trading |  | 1,373 | 1,362
Level 1 | Other assets — derivatives |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 0 | 0
Level 2 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 3,960 | 3,712
Variable annuity assets (separate accounts) | [1] | 606 | 608
Total assets accounted for at fair value |  | 39,162 | 35,685
Liabilities: |  |  |
Liabilities of managed investment entities |  | 3,734 | 3,468
Total liabilities accounted for at fair value |  | 3,741 | 3,474
Level 2 | Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 2 | Derivatives in long-term debt |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | (6) | (2)
Level 2 | Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 13 | 8
Level 2 | Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 33,698 | 30,664
Trading fixed maturities |  | 336 | 241
Level 2 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 191 | 192
Level 2 | States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 6,956 | 6,767
Level 2 | Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 141 | 154
Level 2 | Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 3,597 | 3,305
Level 2 | Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 1,815 | 2,148
Level 2 | Asset-backed securities (“ABS”) |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 5,422 | 4,464
Level 2 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 15,576 | 13,634
Level 2 | Equity securities |  |  |
Assets: |  |  |
Equity securities — AFS and trading |  | 101 | 217
Level 2 | Other assets — derivatives |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 14 | 2
Level 3 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 24 | 26
Variable annuity assets (separate accounts) | [1] | 0 | 0
Total assets accounted for at fair value |  | 1,717 | 1,636
Liabilities: |  |  |
Liabilities of managed investment entities |  | 23 | 24
Total liabilities accounted for at fair value |  | 1,711 | 1,393
Level 3 | Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 1,688 | 1,369
Level 3 | Derivatives in long-term debt |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 3 | Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 3 | Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 1,528 | 1,470
Trading fixed maturities |  | 0 | 0
Level 3 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 8 | 15
Level 3 | States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 91 | 89
Level 3 | Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 3 | Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 219 | 224
Level 3 | Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 34 | 39
Level 3 | Asset-backed securities (“ABS”) |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 467 | 470
Level 3 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 709 | 633
Level 3 | Equity securities |  |  |
Assets: |  |  |
Equity securities — AFS and trading |  | 165 | 140
Level 3 | Other assets — derivatives |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 0 | 0
Equity index call options | Other investments — equity index call options |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 447 | 241
Equity index call options | Level 1 | Other investments — equity index call options |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 0 | 0
Equity index call options | Level 2 | Other investments — equity index call options |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | 447 | 241
Equity index call options | Level 3 | Other investments — equity index call options |  |  |
Assets: |  |  |
Derivatives included in other investments and other assets |  | $ 0 | $ 0
[1] | Variable annuity liabilities equal the fair value of variable annuity assets.

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