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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, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Fixed income securities: | $ 66,551 | $ 59,044
Equity securities | 4,395 | 8,162
Short-term investments | 4,559 | 4,256
Separate account assets | 3,064 | 3,044
Counterparty and cash collateral netting | $ (25) | $ (40)
% of total assets at fair value | 0.00% | (0.10%)
Total | $ 80,470 | $ 76,461
Liabilities |  |
Counterparty and cash collateral netting | $ 10 | $ 12
Counterparty and cash collateral netting as a percent of liabilities measured at fair value | (1.80%) | (2.20%)
U.S. government and agencies |  |
Assets |  |
Fixed income securities: | $ 2,850 | $ 5,086
Municipal |  |
Assets |  |
Fixed income securities: | 9,709 | 8,620
Foreign government |  |
Assets |  |
Fixed income securities: | 1,017 | 979
ABS |  |
Assets |  |
Fixed income securities: | 1,206 | 862
MBS |  |
Assets |  |
Fixed income securities: | 92 | 419
Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Total assets at fair value | $ 13,399 | $ 17,081
% of total assets at fair value | 17.00% | 22.90%
Liabilities |  |
Total recurring basis liabilities | $ 0 | $ 0
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 | $ 64,473 | $ 56,868
% of total assets at fair value | 81.90% | 76.20%
Liabilities |  |
Total recurring basis liabilities | $ (72) | $ (84)
Liabilities as a percent of liabilities measured at fair value | 12.90% | 15.70%
Significant unobservable inputs (Level 3) |  |
Assets |  |
Total assets at fair value | $ 855 | $ 738
% of total assets at fair value | 1.10% | 1.00%
Liabilities |  |
Total recurring basis liabilities | $ (497) | $ (462)
Liabilities as a percent of liabilities measured at fair value | 88.90% | 86.50%
Investments reported at NAV |  |
Assets |  |
Investments reported at NAV | $ 1,768 | $ 1,814
Recurring |  |
Assets |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | (25) | (40)
Liabilities |  |
Counterparty and cash collateral netting | 10 | 12
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |
Assets |  |
Fixed income securities: | 2,480 | 4,689
Equity securities | 3,647 | 7,407
Short-term investments | 4,207 | 1,940
Other investments: Free-standing derivatives | 0 | 0
Separate account assets | 3,064 | 3,044
Other assets | 1 | 1
Total assets at fair value | 13,399 | 17,081
Liabilities |  |
Other liabilities: Free-standing derivatives | 0 | 0
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |
Assets |  |
Fixed income securities: | 2,480 | 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: | 63,634 | 54,013
Equity securities | 360 | 384
Short-term investments | 322 | 2,291
Other investments: Free-standing derivatives | 157 | 180
Separate account assets | 0 | 0
Other assets | 0 | 0
Total assets at fair value | 64,473 | 56,868
Liabilities |  |
Other liabilities: Free-standing derivatives | (72) | (84)
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |
Assets |  |
Fixed income securities: | 370 | 397
Recurring | Significant other observable inputs (Level 2) | Municipal |  |
Assets |  |
Fixed income securities: | 9,640 | 8,558
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |
Assets |  |
Fixed income securities: | 37,118 | 30,819
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |
Assets |  |
Fixed income securities: | 14,304 | 12,084
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |
Assets |  |
Fixed income securities: | 1,017 | 979
Recurring | Significant other observable inputs (Level 2) | ABS |  |
Assets |  |
Fixed income securities: | 1,124 | 797
Recurring | Significant other observable inputs (Level 2) | MBS |  |
Assets |  |
Fixed income securities: | 61 | 379
Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Fixed income securities: | 437 | 342
Equity securities | 388 | 371
Short-term investments | 30 | 25
Other investments: Free-standing derivatives | 0 | 0
Separate account assets | 0 | 0
Other assets |  | 0
Total assets at fair value | 855 | 738
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: | 69 | 62
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |
Assets |  |
Fixed income securities: | 136 | 61
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |
Assets |  |
Fixed income securities: | 119 | 114
Recurring | Significant unobservable inputs (Level 3) | Foreign government |  |
Assets |  |
Fixed income securities: |  | 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 | (497) | (462)
Fair value |  |
Assets |  |
Total assets at fair value | $ 78,702 | $ 74,647
% of total assets at fair value | 100.00% | 100.00%
Liabilities |  |
Total recurring basis liabilities | $ (559) | $ (534)
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00%
Fair value | Recurring |  |
Assets |  |
Fixed income securities: | $ 66,551 | $ 59,044
Equity securities | 4,395 | 8,162
Short-term investments | 4,559 | 4,256
Other investments: Free-standing derivatives | 132 | 140
Separate account assets | 3,064 | 3,044
Other assets | 1 | 1
Total assets at fair value | 78,702 | 74,647
Liabilities |  |
Other liabilities: Free-standing derivatives | (62) | (72)
Fair value | Recurring | U.S. government and agencies |  |
Assets |  |
Fixed income securities: | 2,850 | 5,086
Fair value | Recurring | Municipal |  |
Assets |  |
Fixed income securities: | 9,709 | 8,620
Fair value | Recurring | Corporate - public |  |
Assets |  |
Fixed income securities: | 37,254 | 30,880
Fair value | Recurring | Corporate - privately placed |  |
Assets |  |
Fixed income securities: | 14,423 | 12,198
Fair value | Recurring | Foreign government |  |
Assets |  |
Fixed income securities: | 1,017 | 979
Fair value | Recurring | ABS |  |
Assets |  |
Fixed income securities: | 1,206 | 862
Fair value | Recurring | MBS |  |
Assets |  |
Fixed income securities: | 92 | 419
Fair value | Recurring | Significant unobservable inputs (Level 3) |  |
Assets |  |
Other assets | 0 |
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: | 82 | 65
Fair value | Recurring | Significant unobservable inputs (Level 3) | MBS |  |
Assets |  |
Fixed income securities: | 31 | 40
Fair value | Contractholder funds: Derivatives embedded in life and annuity contracts | Recurring |  |
Liabilities |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (497) | (462)
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |
Assets |  |
Total assets at fair value | 126 | 50
Municipal Not Rated by Third Party Credit Rating Agencies |  |
Assets |  |
Total assets at fair value | $ 34 | $ 36

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