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Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Assets |  |  |
Fixed income securities: | $ 59,391 | $ 57,839 |
Equity securities | 6,434 | 5,666 |
Short-term investments | 2,198 | 4,288 |
Other investments: Free-standing derivatives | 1 |  | $ 1
Separate account assets | 3,422 | 3,393 |
Counterparty and cash collateral netting | $ (9) | $ (9) |
% of total assets at fair value | 0.00% | 0.00% |
Liabilities |  |  |
Other liabilities: Free-standing derivatives |  |  | $ (4)
Counterparty and cash collateral netting | $ 21 | $ 28 |
Counterparty and cash collateral netting as a percent of liabilities measured at fair value | (6.10%) | (8.40%) |
U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | $ 3,900 | $ 3,637 |
Municipal |  |  |
Assets |  |  |
Fixed income securities: | 7,794 | 7,333 |
Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 1,093 | 1,075 |
Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 611 | 728 |
Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 153 | 270 |
Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 24 | 24 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | $ 12,931 | $ 12,408 |
% of total assets at fair value | 18.00% | 17.40% |
Liabilities |  |  |
Total liabilities at fair value | $ (1) | $ (1) |
Liabilities as a percent of liabilities measured at fair value | 0.30% | 0.30% |
Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value | $ 57,884 | $ 58,161 |
% of total assets at fair value | 80.90% | 81.50% |
Liabilities |  |  |
Total liabilities at fair value | $ (69) | $ (68) |
Liabilities as a percent of liabilities measured at fair value | 20.20% | 20.40% |
Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | $ 765 | $ 762 |
% of total assets at fair value | 1.10% | 1.10% |
Liabilities |  |  |
Total liabilities at fair value | $ (292) | $ (293) |
Liabilities as a percent of liabilities measured at fair value | 85.60% | 87.70% |
Recurring |  |  |
Assets |  |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | $ (9) | $ (9) |
Liabilities |  |  |
Counterparty and cash collateral netting | 21 | 28 |
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Fixed income securities: | 3,190 | 2,918 |
Equity securities | 5,938 | 5,247 |
Short-term investments | 380 | 850 |
Other investments: Free-standing derivatives | 0 | 0 |
Separate account assets | 3,422 | 3,393 |
Other assets | 1 | 0 |
Total assets at fair value | 12,931 | 12,408 |
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: | 3,190 | 2,918 |
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: | 55,629 | 54,363 |
Equity securities | 328 | 256 |
Short-term investments | 1,818 | 3,423 |
Other investments: Free-standing derivatives | 109 | 119 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 57,884 | 58,161 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (69) | (68) |
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 710 | 719 |
Recurring | Significant other observable inputs (Level 2) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 7,687 | 7,208 |
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 32,269 | 31,414 |
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 11,923 | 11,846 |
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 1,093 | 1,075 |
Recurring | Significant other observable inputs (Level 2) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 545 | 650 |
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 640 | 452 |
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 611 | 727 |
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 127 | 248 |
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 24 | 24 |
Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Fixed income securities: | 572 | 558 |
Equity securities | 168 | 163 |
Short-term investments | 0 | 15 |
Other investments: Free-standing derivatives | 1 | 1 |
Separate account assets | 0 | 0 |
Other assets | 0 | 1 |
Total assets at fair value | 741 | 738 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | 0 | (3) |
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: | 107 | 125 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 104 | 78 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 250 | 263 |
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: | 19 | 27 |
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 66 | 42 |
Recurring | Significant unobservable inputs (Level 3) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 0 | 1 |
Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 26 | 22 |
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 | 0 |
Non-recurring | Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value | 0 | 0 |
Non-recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | 24 | 24 |
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 | (292) | (290) |
Fair value |  |  |
Assets |  |  |
Total assets at fair value | $ 71,571 | $ 71,322 |
% of total assets at fair value | 100.00% | 100.00% |
Liabilities |  |  |
Total liabilities at fair value | $ (341) | $ (334) |
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00% |
Fair value | Recurring |  |  |
Assets |  |  |
Fixed income securities: | $ 59,391 | $ 57,839 |
Equity securities | 6,434 | 5,666 |
Short-term investments | 2,198 | 4,288 |
Other investments: Free-standing derivatives | 101 | 111 |
Separate account assets | 3,422 | 3,393 |
Other assets | 1 | 1 |
Total assets at fair value | 71,547 | 71,298 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (49) | (44) |
Fair value | Recurring | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 3,900 | 3,637 |
Fair value | Recurring | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 7,794 | 7,333 |
Fair value | Recurring | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 32,373 | 31,492 |
Fair value | Recurring | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 12,173 | 12,109 |
Fair value | Recurring | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 1,093 | 1,075 |
Fair value | Recurring | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 564 | 677 |
Fair value | Recurring | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 706 | 494 |
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 611 | 728 |
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 153 | 270 |
Fair value | Recurring | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 24 | 24 |
Fair value | Non-recurring |  |  |
Assets |  |  |
Total assets at fair value | 24 | 24 |
Liabilities |  |  |
Limited partnership interests | 14 | 24 |
Mortgages loans | 10 |  |
Fair value | Derivatives embedded in life and annuity contracts | Recurring |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (292) | (290) |
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |  |
Assets |  |  |
Total assets at fair value | 304 | 307 |
Municipal Not Rated by Third Party Credit Rating Agencies |  |  |
Assets |  |  |
Total assets at fair value | $ 62 | $ 80 |

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