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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Assets |  |  |
Fixed income securities | $ 58,992 | $ 57,839 |
Equity securities | 6,621 | 5,666 |
Short-term investments | 1,944 | 4,288 |
Other investments: Free-standing derivatives | 1 | 1 | $ 1
Separate account assets | 3,444 | 3,393 |
Counterparty and cash collateral netting | $ (6) | $ (9) |
Assets as a percent of assets measured at fair value | 0.00% | 0.00% |
Liabilities |  |  |
Other liabilities: Free-standing derivatives |  | $ (3) | $ (8)
Counterparty and cash collateral netting | $ 14 | $ 28 |
Liabilities as a percent of liabilities measured at fair value | (3.90%) | (8.40%) |
Limited partnership interests | $ 3 | $ 24 |
U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities | 3,616 | 3,637 |
Municipal |  |  |
Assets |  |  |
Fixed income securities | 8,328 | 7,333 |
Foreign government |  |  |
Assets |  |  |
Fixed income securities | 1,021 | 1,075 |
RMBS |  |  |
Assets |  |  |
Fixed income securities | 578 | 728 |
CMBS |  |  |
Assets |  |  |
Fixed income securities | 128 | 270 |
Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities | 23 | 24 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | $ 12,819 | $ 12,408 |
Assets as a percent of assets measured at fair value | 18.00% | 17.40% |
Liabilities |  |  |
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 | $ 57,478 | $ 58,161 |
Assets as a percent of assets measured at fair value | 80.80% | 81.50% |
Liabilities |  |  |
Liabilities as a percent of liabilities measured at fair value | 23.30% | 20.40% |
Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | $ 840 | $ 762 |
Assets as a percent of assets measured at fair value | 1.20% | 1.10% |
Liabilities |  |  |
Liabilities as a percent of liabilities measured at fair value | 80.30% | 87.70% |
Recurring |  |  |
Assets |  |  |
Counterparty and cash collateral netting | $ (6) | $ (9) |
Liabilities |  |  |
Counterparty and cash collateral netting | 14 | 28 |
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Fixed income securities | 3,079 | 2,918 |
Equity securities | 6,032 | 5,247 |
Short-term investments | 264 | 850 |
Other investments: Free-standing derivatives | 0 | 0 |
Separate account assets | 3,444 | 3,393 |
Other assets | 0 | 0 |
Total assets at fair value | 12,819 | 12,408 |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0 |
Other liabilities: Free-standing derivatives | (1) | (1) |
Total liabilities at fair value | (1) | (1) |
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities | 3,079 | 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) | RMBS |  |  |
Assets |  |  |
Fixed income securities | 0 | 0 |
Recurring | Quoted prices in active markets for identical assets (Level 1) | 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 | 55,307 | 54,363 |
Equity securities | 379 | 256 |
Short-term investments | 1,660 | 3,423 |
Other investments: Free-standing derivatives | 132 | 119 |
Separate account assets | 0 | 0 |
Other assets | 0 | 0 |
Total assets at fair value | 57,478 | 58,161 |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | 0 | 0 |
Other liabilities: Free-standing derivatives | (83) | (68) |
Total liabilities at fair value | (83) | (68) |
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities | 537 | 719 |
Recurring | Significant other observable inputs (Level 2) | Municipal |  |  |
Assets |  |  |
Fixed income securities | 8,227 | 7,208 |
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities | 31,963 | 31,414 |
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities | 11,731 | 11,846 |
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |  |
Assets |  |  |
Fixed income securities | 1,021 | 1,075 |
Recurring | Significant other observable inputs (Level 2) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities | 480 | 650 |
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities | 645 | 452 |
Recurring | Significant other observable inputs (Level 2) | RMBS |  |  |
Assets |  |  |
Fixed income securities | 578 | 727 |
Recurring | Significant other observable inputs (Level 2) | CMBS |  |  |
Assets |  |  |
Fixed income securities | 102 | 248 |
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities | 23 | 24 |
Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Fixed income securities | 606 | 558 |
Equity securities | 210 | 163 |
Short-term investments | 20 | 15 |
Other investments: Free-standing derivatives | 1 | 1 |
Separate account assets | 0 | 0 |
Other assets | 0 | 1 |
Total assets at fair value | 837 | 738 |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (286) | (290) |
Other liabilities: Free-standing derivatives | 0 | (3) |
Total liabilities at fair value | (286) | (293) |
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 | 101 | 125 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities | 108 | 78 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities | 224 | 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 | 99 | 27 |
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities | 48 | 42 |
Recurring | Significant unobservable inputs (Level 3) | RMBS |  |  |
Assets |  |  |
Fixed income securities | 0 | 1 |
Recurring | Significant unobservable inputs (Level 3) | 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 | 3 | 24 |
Fair value |  |  |
Assets |  |  |
Total assets at fair value | $ 71,131 | $ 71,322 |
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 | $ 58,992 | $ 57,839 |
Equity securities | 6,621 | 5,666 |
Short-term investments | 1,944 | 4,288 |
Other investments: Free-standing derivatives | 127 | 111 |
Separate account assets | 3,444 | 3,393 |
Other assets | 0 | 1 |
Total assets at fair value | 71,128 | 71,298 |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (286) | (290) |
Other liabilities: Free-standing derivatives | (70) | (44) |
Total liabilities at fair value | (356) | (334) |
Fair value | Recurring | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities | 3,616 | 3,637 |
Fair value | Recurring | Municipal |  |  |
Assets |  |  |
Fixed income securities | 8,328 | 7,333 |
Fair value | Recurring | Corporate - public |  |  |
Assets |  |  |
Fixed income securities | 32,071 | 31,492 |
Fair value | Recurring | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities | 11,955 | 12,109 |
Fair value | Recurring | Foreign government |  |  |
Assets |  |  |
Fixed income securities | 1,021 | 1,075 |
Fair value | Recurring | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities | 579 | 677 |
Fair value | Recurring | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities | 693 | 494 |
Fair value | Recurring | RMBS |  |  |
Assets |  |  |
Fixed income securities | 578 | 728 |
Fair value | Recurring | CMBS |  |  |
Assets |  |  |
Fixed income securities | 128 | 270 |
Fair value | Recurring | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities | 23 | 24 |
Fair value | Non-recurring |  |  |
Assets |  |  |
Total assets at fair value | $ 3 | $ 24 |

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