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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, 2018
Dec. 31, 2017
Sep. 30, 2017
Assets      
Fixed income securities: $ 57,663 $ 58,992  
Short-term investments 3,071 1,944  
Other investments: Free-standing derivatives 1   $ 1
Separate account assets 3,307 3,444  
Counterparty and cash collateral netting $ (13) $ (6)  
% of total assets at fair value 0.00% 0.00%  
Total $ 72,823    
Liabilities      
Counterparty and cash collateral netting $ 6 $ 14  
Counterparty and cash collateral netting as a percent of liabilities measured at fair value (2.00%) (3.90%)  
U.S. government and agencies      
Assets      
Fixed income securities: $ 3,151 $ 3,616  
Municipal      
Assets      
Fixed income securities: 9,415 8,328  
Foreign government      
Assets      
Fixed income securities: 854 1,021  
Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 500 578  
Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 80 128  
Redeemable preferred stock      
Assets      
Fixed income securities: 22 23  
Quoted prices in active markets for identical assets (Level 1)      
Assets      
Total recurring assets at fair value $ 13,514 $ 12,819  
% of total assets at fair value 19.00% 18.00%  
Liabilities      
Total recurring 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 recurring assets at fair value $ 56,817 $ 57,478  
% of total assets at fair value 79.90% 80.80%  
Liabilities      
Total recurring liabilities at fair value $ (47) $ (83)  
Liabilities as a percent of liabilities measured at fair value 15.30% 23.30%  
Significant unobservable inputs (Level 3)      
Assets      
Total recurring assets at fair value $ 796 $ 840  
% of total assets at fair value 1.10% 1.20%  
Liabilities      
Total recurring liabilities at fair value $ (266) $ (286)  
Liabilities as a percent of liabilities measured at fair value 86.70% 80.30%  
Investments reported at NAV      
Assets      
Investments reported at NAV $ 1,709    
Recurring      
Assets      
Other investments: Free-standing derivatives, Counterparty and cash collateral netting (13) $ (6)  
Liabilities      
Counterparty and cash collateral netting 6 14  
Recurring | Quoted prices in active markets for identical assets (Level 1)      
Assets      
Fixed income securities: 2,693 3,079  
Equity securities 6,286 6,032  
Short-term investments 1,228 264  
Other investments: Free-standing derivatives 0 0  
Separate account assets 3,307 3,444  
Total recurring 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: 2,693 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: 54,515 55,307  
Equity securities 359 379  
Short-term investments 1,823 1,660  
Other investments: Free-standing derivatives 120 132  
Separate account assets 0 0  
Total recurring assets at fair value   57,478  
Liabilities      
Other liabilities: Free-standing derivatives (47) (83)  
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies      
Assets      
Fixed income securities: 458 537  
Recurring | Significant other observable inputs (Level 2) | Municipal      
Assets      
Fixed income securities: 9,326 8,227  
Recurring | Significant other observable inputs (Level 2) | Corporate - public      
Assets      
Fixed income securities: 30,758 31,963  
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed      
Assets      
Fixed income securities: 11,645 11,731  
Recurring | Significant other observable inputs (Level 2) | Foreign government      
Assets      
Fixed income securities: 854 1,021  
Recurring | Significant other observable inputs (Level 2) | ABS - CDO      
Assets      
Fixed income securities: 310 480  
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other      
Assets      
Fixed income securities: 588 645  
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 500 578  
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 54 102  
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock      
Assets      
Fixed income securities: 22 23  
Recurring | Significant unobservable inputs (Level 3)      
Assets      
Fixed income securities: 455 606  
Equity securities 320 210  
Short-term investments 20 20  
Other investments: Free-standing derivatives 1 1  
Separate account assets 0 0  
Total recurring 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: 89 101  
Recurring | Significant unobservable inputs (Level 3) | Corporate - public      
Assets      
Fixed income securities: 92 108  
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed      
Assets      
Fixed income securities: 167 224  
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: 29 99  
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other      
Assets      
Fixed income securities: 52 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: 26 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 recurring assets at fair value   0  
Non-recurring | Significant other observable inputs (Level 2)      
Assets      
Total recurring assets at fair value   0  
Non-recurring | Significant unobservable inputs (Level 3)      
Assets      
Total recurring 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 (266) (286)  
Fair value      
Assets      
Total recurring assets at fair value $ 71,114 $ 71,131  
% of total assets at fair value 100.00% 100.00%  
Liabilities      
Total recurring liabilities at fair value $ (307) $ (356)  
Liabilities as a percent of liabilities measured at fair value 100.00% 100.00%  
Fair value | Recurring      
Assets      
Fixed income securities: $ 57,663 $ 58,992  
Equity securities 6,965 6,621  
Short-term investments 3,071 1,944  
Other investments: Free-standing derivatives 108 127  
Separate account assets 3,307 3,444  
Total recurring assets at fair value   71,128  
Liabilities      
Other liabilities: Free-standing derivatives (41) (70)  
Fair value | Recurring | U.S. government and agencies      
Assets      
Fixed income securities: 3,151 3,616  
Fair value | Recurring | Municipal      
Assets      
Fixed income securities: 9,415 8,328  
Fair value | Recurring | Corporate - public      
Assets      
Fixed income securities: 30,850 32,071  
Fair value | Recurring | Corporate - privately placed      
Assets      
Fixed income securities: 11,812 11,955  
Fair value | Recurring | Foreign government      
Assets      
Fixed income securities: 854 1,021  
Fair value | Recurring | ABS - CDO      
Assets      
Fixed income securities: 339 579  
Fair value | Recurring | ABS - consumer and other      
Assets      
Fixed income securities: 640 693  
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 500 578  
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 80 128  
Fair value | Recurring | Redeemable preferred stock      
Assets      
Fixed income securities: 22 23  
Fair value | Non-recurring      
Assets      
Total recurring 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 (266) (286)  
Fixed Income Securities Valued Based on Nonbinding Broker Quotes      
Assets      
Total recurring assets at fair value 199 271  
Municipal Not Rated by Third Party Credit Rating Agencies      
Assets      
Total recurring assets at fair value $ 48 $ 58