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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 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Assets |  |  |
Fixed income securities: | $ 59,259 | $ 57,170 |
Equity securities | 8,206 | 5,036 |
Short-term investments | 5,254 | 3,027 |
Other investments: Free-standing derivatives |  |  | $ 1
Separate account assets | 2,942 | 2,805 |
Counterparty and cash collateral netting | $ (52) | $ (23) |
% of total assets at fair value | (0.10%) | 0.00% |
Total | $ 77,557 | $ 69,936 |
Liabilities |  |  |
Counterparty and cash collateral netting | $ 5 | $ 6 |
Counterparty and cash collateral netting as a percent of liabilities measured at fair value | (1.00%) | (2.10%) |
U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | $ 4,111 | $ 5,517 |
Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,838 | 9,169 |
Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 993 | 747 |
Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 392 | 464 |
Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 64 | 70 |
Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 21 | $ 22 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | $ 16,633 |  |
% of total assets at fair value | 22.00% | 19.90% |
Liabilities |  |  |
Total recurring basis liabilities | $ (1) | $ (1) |
Liabilities as a percent of liabilities measured at fair value | 0.20% | 0.30% |
Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value | $ 58,448 |  |
% of total assets at fair value | 77.10% | 79.10% |
Liabilities |  |  |
Total recurring basis liabilities | $ (59) | $ (62) |
Liabilities as a percent of liabilities measured at fair value | 11.60% | 22.10% |
Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | $ 767 |  |
% of total assets at fair value | 1.00% | 1.00% |
Liabilities |  |  |
Total recurring basis liabilities | $ (454) | $ (224) |
Liabilities as a percent of liabilities measured at fair value | 89.20% | 79.70% |
Investments reported at NAV |  |  |
Assets |  |  |
Investments reported at NAV | $ 1,761 | $ 1,779 |
Recurring |  |  |
Assets |  |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | (52) | (23) |
Liabilities |  |  |
Counterparty and cash collateral netting | 5 | 6 |
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Fixed income securities: | 3,707 | 5,085 |
Equity securities | 7,453 | 4,364 |
Short-term investments | 2,530 | 1,338 |
Other investments: Free-standing derivatives | 0 | 0 |
Separate account assets | 2,942 | 2,805 |
Other assets | 1 | 2 |
Total assets at fair value | 16,633 | 13,594 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (1) | (1) |
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 3,707 | 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: | 55,185 | 51,760 |
Equity securities | 368 | 331 |
Short-term investments | 2,709 | 1,659 |
Other investments: Free-standing derivatives | 186 | 139 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 58,448 | 53,889 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (59) | (62) |
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 404 | 432 |
Recurring | Significant other observable inputs (Level 2) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,774 | 9,099 |
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 31,538 | 29,200 |
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 12,289 | 10,776 |
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 993 | 747 |
Recurring | Significant other observable inputs (Level 2) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 297 | 263 |
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 447 | 713 |
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 392 | 464 |
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 30 | 44 |
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 21 | 22 |
Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Fixed income securities: | 367 | 325 |
Equity securities | 385 | 341 |
Short-term investments | 15 | 30 |
Other investments: Free-standing derivatives | 0 | 1 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 767 | 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: | 64 | 70 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 104 | 70 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 87 | 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: | 63 | 6 |
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 15 | 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: | 34 | 26 |
Recurring | Significant unobservable inputs (Level 3) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Contractholder funds: 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 |
Contractholder funds: 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 |
Contractholder funds: Derivatives embedded in life and annuity contracts | Recurring | Significant unobservable inputs (Level 3) |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (454) | $ (224) |
Fair value |  |  |
Assets |  |  |
Total assets at fair value | $ 75,796 |  |
% of total assets at fair value | 100.00% | 100.00% |
Liabilities |  |  |
Total recurring basis liabilities | $ (509) | $ (281) |
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00% |
Fair value | Recurring |  |  |
Assets |  |  |
Fixed income securities: | $ 59,259 | $ 57,170 |
Equity securities | 8,206 | 5,036 |
Short-term investments | 5,254 | 3,027 |
Other investments: Free-standing derivatives | 134 | 117 |
Separate account assets | 2,942 | 2,805 |
Other assets | 1 | 2 |
Total assets at fair value | 75,796 | 68,157 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (55) | (57) |
Fair value | Recurring | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 4,111 | 5,517 |
Fair value | Recurring | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,838 | 9,169 |
Fair value | Recurring | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 31,642 | 29,270 |
Fair value | Recurring | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 12,376 | 10,866 |
Fair value | Recurring | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 993 | 747 |
Fair value | Recurring | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 360 | 269 |
Fair value | Recurring | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 462 | 776 |
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 392 | 464 |
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 64 | 70 |
Fair value | Recurring | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 21 | 22 |
Fair value | Contractholder funds: Derivatives embedded in life and annuity contracts | Recurring |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (454) | (224) |
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |  |
Assets |  |  |
Total assets at fair value | 87 | 105 |
Municipal Not Rated by Third Party Credit Rating Agencies |  |  |
Assets |  |  |
Total assets at fair value | $ 37 | $ 44 |

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