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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, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Fixed income securities | $ 59,044 | $ 57,170
Equity securities | 8,162 | 5,036
Short-term investments | 4,256 | 3,027
Separate account assets | 3,044 | $ 2,805
Counterparty and cash collateral netting | (40) |
Derivative Asset Net of Offsets and Securities Collateral | $ (40) |
Assets as a percent of assets measured at fair value | (0.10%) | 0.00%
Total | $ 76,461 | $ 69,936
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | (2.20%) | (2.10%)
U.S. government and agencies |  |
Assets |  |
Fixed income securities | $ 5,086 | $ 5,517
Municipal |  |
Assets |  |
Fixed income securities | 8,620 | 9,169
Foreign government |  |
Assets |  |
Fixed income securities | 979 | 747
ABS |  |
Assets |  |
Fixed income securities | 862 | 1,045
MBS |  |
Assets |  |
Fixed income securities | 419 | $ 534
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 17,081 |
Assets as a percent of assets measured at fair value | 22.90% | 19.90%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 0.00% | 0.30%
Significant other observable inputs (Level 2) |  |
Assets |  |
Total assets at fair value | $ 56,868 |
Assets as a percent of assets measured at fair value | 76.20% | 79.10%
Liabilities |  |
Liabilities as a percent of liabilities measured at fair value | 15.70% | 22.10%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 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 | 86.50% | 79.70%
Investments reported at NAV |  |
Assets |  |
Investments measured using the net asset value practical expedient | $ 1,814 | $ 1,779
Recurring |  |
Assets |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | 40 | 23
Counterparty and cash collateral netting |  | (23)
Liabilities |  |
Counterparty and cash collateral netting | 12 | 6
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities | 4,689 | 5,085
Equity securities | 7,407 | 4,364
Short-term investments | 1,940 | 1,338
Other investments: Free-standing derivatives | 0 | 0
Separate account assets | 3,044 | 2,805
Other assets | 1 | 2
Total assets at fair value |  | 13,594
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0
Other liabilities: Free-standing derivatives | 0 | (1)
Total liabilities at fair value | 0 | (1)
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 4,689 | 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 |  |
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 | 54,013 | 51,760
Equity securities | 384 | 331
Short-term investments | 2,291 | 1,659
Other investments: Free-standing derivatives | 180 | 139
Separate account assets | 0 | 0
Other assets | 0 | 0
Total assets at fair value |  | 53,889
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0
Other liabilities: Free-standing derivatives | (84) | (62)
Total liabilities at fair value | (84) | (62)
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 397 | 432
Recurring | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities | 8,558 | 9,099
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities | 30,819 | 29,200
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 12,084 | 10,798
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities | 979 | 747
Recurring | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities | 797 | 976
Recurring | Significant other observable inputs (Level 2) | MBS |  |
Assets |  |
Fixed income securities | 379 | 508
Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities | 342 | 325
Equity securities | 371 | 341
Short-term investments | 25 | 30
Other investments: Free-standing derivatives | 0 | 1
Separate account assets | 0 | 0
Other assets | 0 | 0
Total assets at fair value |  | 697
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (462) | (224)
Other liabilities: Free-standing derivatives | 0 | 0
Total liabilities at fair value | (462) | (224)
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 | 62 | 70
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities | 61 | 70
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 114 | 90
Recurring | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities | 0 | 0
Recurring | Significant unobservable inputs (Level 3) | ABS |  |
Assets |  |
Fixed income securities | 65 | 69
Recurring | Significant unobservable inputs (Level 3) | MBS |  |
Assets |  |
Fixed income securities | 40 | $ 26
Fair value |  |
Assets |  |
Total assets at fair value | $ 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 | $ 59,044 | $ 57,170
Equity securities | 8,162 | 5,036
Short-term investments | 4,256 | 3,027
Other investments: Free-standing derivatives | 140 | 117
Separate account assets | 3,044 | 2,805
Other assets | 1 | 2
Total assets at fair value |  | 68,157
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (462) | (224)
Other liabilities: Free-standing derivatives | (72) | (57)
Total liabilities at fair value | (534) | (281)
Fair value | Recurring | U.S. government and agencies |  |
Assets |  |
Fixed income securities | 5,086 | 5,517
Fair value | Recurring | Municipal |  |
Assets |  |
Fixed income securities | 8,620 | 9,169
Fair value | Recurring | Corporate - public |  |
Assets |  |
Fixed income securities | 30,880 | 29,270
Fair value | Recurring | Corporate - privately placed |  |
Assets |  |
Fixed income securities | 12,198 | 10,888
Fair value | Recurring | Foreign government |  |
Assets |  |
Fixed income securities | 979 | 747
Fair value | Recurring | ABS |  |
Assets |  |
Fixed income securities | 862 | 1,045
Fair value | Recurring | MBS |  |
Assets |  |
Fixed income securities | $ 419 | $ 534

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