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Fair Value Measurements - Assets and liabilities measured and carried at fair value in the financial statements (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | $ 39,648 | $ 38,379
Trading fixed maturities |  | 137 | 348
Equity index call options |  | 615 | 701
Assets of managed investment entities (“MIE”) |  | 5,032 | 4,902
Variable annuity assets (separate accounts) | [1] | 636 | 644
Total assets accounted for at fair value |  | 47,845 | 46,636
Liabilities: |  |  |
Liabilities of managed investment entities |  | 4,840 | 4,687
Total liabilities accounted for at fair value |  | 7,688 | 7,264
Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 2,776 | 2,542
Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 72 | 35
Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 39,648 | 38,379
Trading fixed maturities |  | 137 | 348
U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 240 | 242
States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 6,913 | 7,123
Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 129 | 127
Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 2,886 | 3,227
Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 934 | 962
Asset-backed securities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 8,935 | 7,962
Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 19,611 | 18,736
Equity securities |  |  |
Assets: |  |  |
Equity securities |  | 1,777 | 1,662
Level 1 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 229 | 307
Variable annuity assets (separate accounts) | [1] | 0 | 0
Total assets accounted for at fair value |  | 1,907 | 1,914
Liabilities: |  |  |
Liabilities of managed investment entities |  | 220 | 293
Total liabilities accounted for at fair value |  | 220 | 293
Level 1 | Annuity benefits accumulated |  |  |
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 |  | 169 | 152
Trading fixed maturities |  | 38 | 44
Level 1 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 140 | 122
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 |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 1 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 29 | 30
Level 1 | Equity securities |  |  |
Assets: |  |  |
Equity securities |  | 1,471 | 1,411
Level 2 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 4,780 | 4,572
Variable annuity assets (separate accounts) | [1] | 636 | 644
Total assets accounted for at fair value |  | 43,001 | 42,432
Liabilities: |  |  |
Liabilities of managed investment entities |  | 4,598 | 4,372
Total liabilities accounted for at fair value |  | 4,670 | 4,407
Level 2 | Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 0 | 0
Level 2 | Other liabilities — derivatives |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 72 | 35
Level 2 | Fixed maturities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 36,795 | 36,125
Trading fixed maturities |  | 99 | 304
Level 2 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 92 | 112
Level 2 | States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 6,852 | 6,975
Level 2 | Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 129 | 127
Level 2 | Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 2,739 | 3,105
Level 2 | Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 878 | 926
Level 2 | Asset-backed securities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 7,931 | 7,218
Level 2 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 18,174 | 17,662
Level 2 | Equity securities |  |  |
Assets: |  |  |
Equity securities |  | 76 | 86
Level 3 |  |  |
Assets: |  |  |
Assets of managed investment entities (“MIE”) |  | 23 | 23
Variable annuity assets (separate accounts) | [1] | 0 | 0
Total assets accounted for at fair value |  | 2,937 | 2,290
Liabilities: |  |  |
Liabilities of managed investment entities |  | 22 | 22
Total liabilities accounted for at fair value |  | 2,798 | 2,564
Level 3 | Annuity benefits accumulated |  |  |
Liabilities: |  |  |
Derivatives included in annuity benefits accumulated, long-term debt, and other liabilities |  | 2,776 | 2,542
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 |  | 2,684 | 2,102
Trading fixed maturities |  | 0 | 0
Level 3 | U.S. Government and government agencies |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 8 | 8
Level 3 | States, municipalities and political subdivisions |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 61 | 148
Level 3 | Foreign government |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 0 | 0
Level 3 | Residential MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 147 | 122
Level 3 | Commercial MBS |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 56 | 36
Level 3 | Asset-backed securities |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 1,004 | 744
Level 3 | Corporate and other |  |  |
Assets: |  |  |
Available for sale (AFS) fixed maturities |  | 1,408 | 1,044
Level 3 | Equity securities |  |  |
Assets: |  |  |
Equity securities |  | 230 | 165
Equity index call options | Equity index call options |  |  |
Assets: |  |  |
Equity index call options |  | 615 | 701
Equity index call options | Level 1 | Equity index call options |  |  |
Assets: |  |  |
Equity index call options |  | 0 | 0
Equity index call options | Level 2 | Equity index call options |  |  |
Assets: |  |  |
Equity index call options |  | 615 | 701
Equity index call options | Level 3 | Equity index call options |  |  |
Assets: |  |  |
Equity index call options |  | $ 0 | $ 0
[1] | Variable annuity liabilities equal the fair value of variable annuity assets.

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