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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 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Fixed income securities: | $ 56,674 | $ 58,992 |
Equity securities | 6,986 | 6,621 |
Short-term investments | 3,424 | 1,944 |
Other investments: Free-standing derivatives | 1 |  | $ 1
Separate account assets | 3,314 | 3,444 |
Counterparty and cash collateral netting | $ (15) | $ (6) |
% of total assets at fair value | 0.00% | 0.00% |
Investments reported at NAV | $ 1,663 |  |
Total investments | 72,164 |  |
Liabilities |  |  |
Other liabilities: Free-standing derivatives |  |  | $ (2)
Counterparty and cash collateral netting | $ 26 | $ 14 |
Counterparty and cash collateral netting as a percent of liabilities measured at fair value | (8.40%) | (3.90%) |
U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | $ 3,406 | $ 3,616 |
Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,569 | 8,328 |
Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 979 | 1,021 |
Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 550 | 578 |
Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 99 | 128 |
Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 23 | 23 |
Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Total assets at fair value | $ 12,935 | $ 12,819 |
% of total assets at fair value | 18.40% | 18.00% |
Liabilities |  |  |
Total liabilities at fair value | $ 0 | $ (1) |
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 | $ 56,851 | $ 57,478 |
% of total assets at fair value | 80.60% | 80.80% |
Liabilities |  |  |
Total liabilities at fair value | $ (75) | $ (83) |
Liabilities as a percent of liabilities measured at fair value | 24.10% | 23.30% |
Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value | $ 730 | $ 840 |
% of total assets at fair value | 1.00% | 1.20% |
Liabilities |  |  |
Total liabilities at fair value | $ (262) | $ (286) |
Liabilities as a percent of liabilities measured at fair value | 84.30% | 80.30% |
Recurring |  |  |
Assets |  |  |
Other investments: Free-standing derivatives, Counterparty and cash collateral netting | $ (15) | $ (6) |
Liabilities |  |  |
Counterparty and cash collateral netting | 26 | 14 |
Recurring | Quoted prices in active markets for identical assets (Level 1) |  |  |
Assets |  |  |
Fixed income securities: | 2,845 | 3,079 |
Equity securities | 6,374 | 6,032 |
Short-term investments | 402 | 264 |
Other investments: Free-standing derivatives | 0 | 0 |
Separate account assets | 3,314 | 3,444 |
Other assets |  | 0 |
Total assets at fair value |  | 12,819 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | 0 | (1) |
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 2,845 | 3,079 |
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: | 53,342 | 55,307 |
Equity securities | 370 | 379 |
Short-term investments | 3,022 | 1,660 |
Other investments: Free-standing derivatives | 117 | 132 |
Separate account assets | 0 | 0 |
Other assets |  | 0 |
Total assets at fair value |  | 57,478 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (75) | (83) |
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 561 | 537 |
Recurring | Significant other observable inputs (Level 2) | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,473 | 8,227 |
Recurring | Significant other observable inputs (Level 2) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 30,535 | 31,963 |
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 11,024 | 11,731 |
Recurring | Significant other observable inputs (Level 2) | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 979 | 1,021 |
Recurring | Significant other observable inputs (Level 2) | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 450 | 480 |
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 675 | 645 |
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 550 | 578 |
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 72 | 102 |
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 23 | 23 |
Recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Fixed income securities: | 487 | 606 |
Equity securities | 242 | 210 |
Short-term investments | 0 | 20 |
Other investments: Free-standing derivatives | 1 | 1 |
Separate account assets | 0 | 0 |
Other assets |  | 0 |
Total assets at fair value |  | 837 |
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: | 96 | 101 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 77 | 108 |
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 215 | 224 |
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: | 10 | 99 |
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 62 | 48 |
Recurring | Significant unobservable inputs (Level 3) | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 0 | 0 |
Recurring | Significant unobservable inputs (Level 3) | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 27 | 26 |
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 |
Non-recurring | Significant other observable inputs (Level 2) |  |  |
Assets |  |  |
Total assets at fair value |  | 0 |
Non-recurring | Significant unobservable inputs (Level 3) |  |  |
Assets |  |  |
Total assets at fair value |  | 3 |
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 | (262) | (286) |
Fair value |  |  |
Assets |  |  |
Total assets at fair value | $ 70,501 | $ 71,131 |
% of total assets at fair value | 100.00% | 100.00% |
Liabilities |  |  |
Total liabilities at fair value | $ (311) | $ (356) |
Liabilities as a percent of liabilities measured at fair value | 100.00% | 100.00% |
Fair value | Recurring |  |  |
Assets |  |  |
Fixed income securities: | $ 56,674 | $ 58,992 |
Equity securities | 6,986 | 6,621 |
Short-term investments | 3,424 | 1,944 |
Other investments: Free-standing derivatives | 103 | 127 |
Separate account assets | 3,314 | 3,444 |
Other assets |  | 0 |
Total assets at fair value |  | 71,128 |
Liabilities |  |  |
Other liabilities: Free-standing derivatives | (49) | (70) |
Fair value | Recurring | U.S. government and agencies |  |  |
Assets |  |  |
Fixed income securities: | 3,406 | 3,616 |
Fair value | Recurring | Municipal |  |  |
Assets |  |  |
Fixed income securities: | 8,569 | 8,328 |
Fair value | Recurring | Corporate - public |  |  |
Assets |  |  |
Fixed income securities: | 30,612 | 32,071 |
Fair value | Recurring | Corporate - privately placed |  |  |
Assets |  |  |
Fixed income securities: | 11,239 | 11,955 |
Fair value | Recurring | Foreign government |  |  |
Assets |  |  |
Fixed income securities: | 979 | 1,021 |
Fair value | Recurring | ABS - CDO |  |  |
Assets |  |  |
Fixed income securities: | 460 | 579 |
Fair value | Recurring | ABS - consumer and other |  |  |
Assets |  |  |
Fixed income securities: | 737 | 693 |
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 550 | 578 |
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”) |  |  |
Assets |  |  |
Fixed income securities: | 99 | 128 |
Fair value | Recurring | Redeemable preferred stock |  |  |
Assets |  |  |
Fixed income securities: | 23 | 23 |
Fair value | Non-recurring |  |  |
Assets |  |  |
Total assets at fair value |  | 3 |
Liabilities |  |  |
Limited partnership interests |  | 3 |
Fair value | Derivatives embedded in life and annuity contracts | Recurring |  |  |
Liabilities |  |  |
Contractholder funds: Derivatives embedded in life and annuity contracts | (262) | (286) |
Fixed Income Securities Valued Based on Nonbinding Broker Quotes |  |  |
Assets |  |  |
Total assets at fair value | 278 | 271 |
Municipal Not Rated by Third Party Credit Rating Agencies |  |  |
Assets |  |  |
Total assets at fair value | $ 54 | $ 58 |

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