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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 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Fixed income securities | $ 66,354 | $ 59,044
Equity securities | 4,710 | 8,162
Short-term investments | 7,800 | 4,256
Separate account assets | 3,344 | 3,044
Counterparty and cash collateral netting | (15) |
Assets at fair value counterparty and cash collateral netting | $ (15) | $ (40)
Assets as a percent of assets measured at fair value | 0.00% | (0.10%)
Total | $ 84,237 | $ 76,461
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | (4.20%) | (2.20%)
U.S. government and agencies |  |
Assets |  |
Fixed income securities | $ 3,222 | $ 5,086
Municipal |  |
Assets |  |
Fixed income securities | 9,587 | 8,620
Foreign government |  |
Assets |  |
Fixed income securities | 1,055 | 979
ABS |  |
Assets |  |
Fixed income securities | 1,270 | 862
MBS |  |
Assets |  |
Fixed income securities | 78 | 419
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 17,567 | $ 17,081
Assets as a percent of assets measured at fair value | 21.30% | 22.90%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 0.00% | 0.00%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 64,029 | $ 56,868
Assets as a percent of assets measured at fair value | 77.70% | 76.20%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 23.80% | 15.70%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 832 | $ 738
Assets as a percent of assets measured at fair value | 1.00% | 1.00%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 80.40% | 86.50%
Investments reported at NAV |  |
Assets |  |
Investments measured using the net asset value practical expedient | $ 1,824 | $ 1,814
Recurring |  |
Assets |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | (15) | (40)
Counterparty and cash collateral netting |  | (40)
Liabilities |  |
Counterparty and cash collateral netting | 27 | 12
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities | 2,863 | 4,689
Equity securities | 3,882 | 7,407
Short-term investments | 7,477 | 1,940
Other investments: Free-standing derivatives | 0 | 0
Separate account assets | 3,344 | 3,044
Other assets | 1 | 1
Total assets at fair value |  | 17,081
Liabilities |  |
Other liabilities: Free-standing derivatives | 0 | 0
Total liabilities at fair value | 0 | 0
Recurring | Quoted prices in active markets for identical assets (Level 1) | Contractholder funds: Derivatives embedded in life and annuity contracts |  |
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 2,863 | 4,689
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 |  |
Assets |  |
Fixed income securities | 0 | 0
Recurring | Quoted prices in active markets for identical assets (Level 1) | MBS |  |
Assets |  |
Fixed income securities | 0 | 0
Recurring | Significant other observable inputs (Level 2) |  |
Assets |  |
Fixed income securities | 63,112 | 54,013
Equity securities | 410 | 384
Short-term investments | 288 | 2,291
Other investments: Free-standing derivatives | 219 | 180
Separate account assets | 0 | 0
Other assets | 0 | 0
Total assets at fair value |  | 56,868
Liabilities |  |
Other liabilities: Free-standing derivatives | (153) | (84)
Total liabilities at fair value | (153) | (84)
Recurring | Significant other observable inputs (Level 2) | Contractholder funds: Derivatives embedded in life and annuity contracts |  |
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 359 | 397
Recurring | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities | 9,520 | 8,558
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities | 36,346 | 30,819
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 14,568 | 12,084
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities | 1,055 | 979
Recurring | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities | 1,213 | 797
Recurring | Significant other observable inputs (Level 2) | MBS |  |
Assets |  |
Fixed income securities | 51 | 379
Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities | 379 | 342
Equity securities | 418 | 371
Short-term investments | 35 | 25
Other investments: Free-standing derivatives | 0 | 0
Separate account assets | 0 | 0
Other assets | 0 | 0
Total assets at fair value |  | 738
Liabilities |  |
Other liabilities: Free-standing derivatives | 0 | 0
Total liabilities at fair value | (516) | (462)
Recurring | Significant unobservable inputs (Level 3) | Contractholder funds: Derivatives embedded in life and annuity contracts |  |
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (516) | (462)
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 | 67 | 62
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities | 98 | 61
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 130 | 114
Recurring | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities |  | 0
Fair value |  |
Assets |  |
Total assets at fair value | $ 82,413 | $ 74,647
Assets as a percent of assets measured at fair value | 100.00% | 100.00%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00%
Fair value | Recurring |  |
Assets |  |
Fixed income securities | $ 66,354 | $ 59,044
Equity securities | 4,710 | 8,162
Short-term investments | 7,800 | 4,256
Other investments: Free-standing derivatives | 204 | 140
Separate account assets | 3,344 | 3,044
Other assets | 1 | 1
Total assets at fair value |  | 74,647
Liabilities |  |
Other liabilities: Free-standing derivatives | (126) | (72)
Total liabilities at fair value | (642) | (534)
Fair value | Recurring | Contractholder funds: Derivatives embedded in life and annuity contracts |  |
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (516) | (462)
Fair value | Recurring | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 3,222 | 5,086
Fair value | Recurring | Municipal |  |
Assets |  |
Fixed income securities | 9,587 | 8,620
Fair value | Recurring | Corporate - public |  |
Assets |  |
Fixed income securities | 36,444 | 30,880
Fair value | Recurring | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 14,698 | 12,198
Fair value | Recurring | Foreign government |  |
Assets |  |
Fixed income securities | 1,055 | 979
Fair value | Recurring | ABS |  |
Assets |  |
Fixed income securities | 1,270 | 862
Fair value | Recurring | MBS |  |
Assets |  |
Fixed income securities | 78 | 419
Fair value | Recurring | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities | 0 |
Fair value | Recurring | Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed income securities | 57 | 65
Fair value | Recurring | Significant unobservable inputs (Level 3) | MBS |  |
Assets |  |
Fixed income securities | $ 27 | $ 40

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