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Fair Value of Assets and Liabilities - Assets and liabilities measured at fair value on a recurring and non-recurring basis (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets |  |  |
Fixed income securities: | $ 58,202 | $ 57,170 |
Short-term investments | 4,157 | 3,027 |
Other investments: Free-standing derivatives | 1 |  | $ 1
Separate account assets | 3,050 | 2,805 |
Counterparty and cash collateral netting | $ (27) | $ (23) |
% of total assets at fair value | 0.00% | 0.00% |
Total | $ 73,087 | $ 69,936 |
Liabilities |  |  |
Counterparty and cash collateral netting | $ 7 | $ 6 |
Counterparty and cash collateral netting as a percent of liabilities measured at fair value | (2.40%) | (2.10%) |
U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | $ 3,892 | $ 5,517 |
Municipal |  |  |
Assets |  |  |
Fixed income securities: | 9,264 | 9,169 |
Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 752 | 747 |
Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 442 | 464 |
Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 73 | 70 |
Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 22 | $ 22 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | $ 13,679 |  |
% of total assets at fair value | 19.20% | 19.90% |
Liabilities |  |  |
Total recurring basis liabilities | $ (2) | $ (1) |
Liabilities as a percent of liabilities measured at fair value | 0.70% | 0.30% |
Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value | $ 56,944 |  |
% of total assets at fair value | 79.80% | 79.10% |
Liabilities |  |  |
Total recurring basis liabilities | $ (51) | $ (62) |
Liabilities as a percent of liabilities measured at fair value | 17.20% | 22.10% |
Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | $ 753 |  |
% of total assets at fair value | 1.00% | 1.00% |
Liabilities |  |  |
Total recurring basis liabilities | $ (251) | $ (224) |
Liabilities as a percent of liabilities measured at fair value | 84.50% | 79.70% |
Investments reported at NAV |  |  |
Assets |  |  |
Investments reported at NAV | $ 1,738 | $ 1,779 |
Recurring |  |  |
Assets |  |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | (27) | (23) |
Liabilities |  |  |
Counterparty and cash collateral netting | 7 | 6 |
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Fixed income securities: | 3,498 | 5,085 |
Equity securities | 5,149 | 4,364 |
Short-term investments | 1,981 | 1,338 |
Other investments: Free-standing derivatives | 0 | 0 |
Separate account assets | 3,050 | 2,805 |
Other assets | 1 | 2 |
Total assets at fair value | 13,679 | 13,594 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (2) | (1) |
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 3,498 | 5,085 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Fixed income securities: | 54,334 | 51,760 |
Equity securities | 350 | 331 |
Short-term investments | 2,136 | 1,659 |
Other investments: Free-standing derivatives | 124 | 139 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 56,944 | 53,889 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (51) | (62) |
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 394 | 432 |
Recurring | Significant other observable inputs (Level 2) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 9,196 | 9,099 |
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 30,982 | 29,200 |
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 11,537 | 10,776 |
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 752 | 747 |
Recurring | Significant other observable inputs (Level 2) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 250 | 263 |
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 721 | 713 |
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 442 | 464 |
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 38 | 44 |
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 22 | 22 |
Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Fixed income securities: | 370 | 325 |
Equity securities | 303 | 341 |
Short-term investments | 40 | 30 |
Other investments: Free-standing derivatives | 1 | 1 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 714 | 697 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | 0 | 0 |
Recurring | Significant unobservable inputs (Level 3) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Significant unobservable inputs (Level 3) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 68 | 70 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 90 | 70 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 90 | 90 |
Recurring | Significant unobservable inputs (Level 3) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Significant unobservable inputs (Level 3) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 6 | 6 |
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 81 | 63 |
Recurring | Significant unobservable inputs (Level 3) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 35 | 26 |
Recurring | Significant unobservable inputs (Level 3) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Non-recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | 0 |  |
Non-recurring | Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value | 0 |  |
Non-recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | 39 |  |
Derivatives embedded in life and annuity contracts | Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0 |
Derivatives embedded in life and annuity contracts | Recurring | Significant other observable inputs (Level 2) |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0 |
Derivatives embedded in life and annuity contracts | Recurring | Significant unobservable inputs (Level 3) |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (251) | $ (224) |
Fair value |  |  |
Assets |  |  |
Total assets at fair value | $ 71,349 |  |
% of total assets at fair value | 100.00% | 100.00% |
Liabilities |  |  |
Total recurring basis liabilities | $ (297) | $ (281) |
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00% |
Fair value | Recurring |  |  |
Assets |  |  |
Fixed income securities: | $ 58,202 | $ 57,170 |
Equity securities | 5,802 | 5,036 |
Short-term investments | 4,157 | 3,027 |
Other investments: Free-standing derivatives | 98 | 117 |
Separate account assets | 3,050 | 2,805 |
Other assets | 1 | 2 |
Total assets at fair value | 71,310 | 68,157 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (46) | (57) |
Fair value | Recurring | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 3,892 | 5,517 |
Fair value | Recurring | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 9,264 | 9,169 |
Fair value | Recurring | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 31,072 | 29,270 |
Fair value | Recurring | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 11,627 | 10,866 |
Fair value | Recurring | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 752 | 747 |
Fair value | Recurring | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 256 | 269 |
Fair value | Recurring | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 802 | 776 |
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 442 | 464 |
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 73 | 70 |
Fair value | Recurring | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 22 | 22 |
Fair value | Non-recurring |  |  |
Assets |  |  |
Total assets at fair value | 39 |  |
Liabilities |  |  |
Limited partnership interests | 3 |  |
Bank loans | 36 |  |
Fair value | Derivatives embedded in life and annuity contracts | Recurring |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (251) | (224) |
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |  |
Assets |  |  |
Total assets at fair value | 127 | 105 |
Municipal Not Rated by Third Party Credit Rating Agencies |  |  |
Assets |  |  |
Total assets at fair value | $ 41 | $ 44 |

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