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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, 2019
Dec. 31, 2018
Mar. 31, 2018
Assets      
Fixed income securities: $ 58,202 $ 57,170  
Short-term investments 4,157 3,027  
Other investments: Free-standing derivatives 1   $ 1
Separate account assets 3,050 2,805  
Counterparty and cash collateral netting $ (27) $ (23)  
% of total assets at fair value 0.00% 0.00%  
Total $ 73,087 $ 69,936  
Liabilities      
Counterparty and cash collateral netting $ 7 $ 6  
Counterparty and cash collateral netting as a percent of liabilities measured at fair value (2.40%) (2.10%)  
U.S. government and agencies      
Assets      
Fixed income securities: $ 3,892 $ 5,517  
Municipal      
Assets      
Fixed income securities: 9,264 9,169  
Foreign government      
Assets      
Fixed income securities: 752 747  
Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 442 464  
Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 73 70  
Redeemable preferred stock      
Assets      
Fixed income securities: 22 $ 22  
Quoted prices in active markets for identical assets (Level 1)      
Assets      
Total assets at fair value $ 13,679    
% of total assets at fair value 19.20% 19.90%  
Liabilities      
Total recurring basis liabilities $ (2) $ (1)  
Liabilities as a percent of liabilities measured at fair value 0.70% 0.30%  
Significant other observable inputs (Level 2)      
Assets      
Total assets at fair value $ 56,944    
% of total assets at fair value 79.80% 79.10%  
Liabilities      
Total recurring basis liabilities $ (51) $ (62)  
Liabilities as a percent of liabilities measured at fair value 17.20% 22.10%  
Significant unobservable inputs (Level 3)      
Assets      
Total assets at fair value $ 753    
% of total assets at fair value 1.00% 1.00%  
Liabilities      
Total recurring basis liabilities $ (251) $ (224)  
Liabilities as a percent of liabilities measured at fair value 84.50% 79.70%  
Investments reported at NAV      
Assets      
Investments reported at NAV $ 1,738 $ 1,779  
Recurring      
Assets      
Other investments: Free-standing derivatives, Counterparty and cash collateral netting (27) (23)  
Liabilities      
Counterparty and cash collateral netting 7 6  
Recurring | Quoted prices in active markets for identical assets (Level 1)      
Assets      
Fixed income securities: 3,498 5,085  
Equity securities 5,149 4,364  
Short-term investments 1,981 1,338  
Other investments: Free-standing derivatives 0 0  
Separate account assets 3,050 2,805  
Other assets 1 2  
Total assets at fair value 13,679 13,594  
Liabilities      
Other liabilities: Free-standing derivatives (2) (1)  
Recurring | Quoted prices in active markets for identical assets (Level 1) | U.S. government and agencies      
Assets      
Fixed income securities: 3,498 5,085  
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: 54,334 51,760  
Equity securities 350 331  
Short-term investments 2,136 1,659  
Other investments: Free-standing derivatives 124 139  
Separate account assets 0 0  
Other assets 0 0  
Total assets at fair value 56,944 53,889  
Liabilities      
Other liabilities: Free-standing derivatives (51) (62)  
Recurring | Significant other observable inputs (Level 2) | U.S. government and agencies      
Assets      
Fixed income securities: 394 432  
Recurring | Significant other observable inputs (Level 2) | Municipal      
Assets      
Fixed income securities: 9,196 9,099  
Recurring | Significant other observable inputs (Level 2) | Corporate - public      
Assets      
Fixed income securities: 30,982 29,200  
Recurring | Significant other observable inputs (Level 2) | Corporate - privately placed      
Assets      
Fixed income securities: 11,537 10,776  
Recurring | Significant other observable inputs (Level 2) | Foreign government      
Assets      
Fixed income securities: 752 747  
Recurring | Significant other observable inputs (Level 2) | ABS - CDO      
Assets      
Fixed income securities: 250 263  
Recurring | Significant other observable inputs (Level 2) | ABS - consumer and other      
Assets      
Fixed income securities: 721 713  
Recurring | Significant other observable inputs (Level 2) | Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 442 464  
Recurring | Significant other observable inputs (Level 2) | Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 38 44  
Recurring | Significant other observable inputs (Level 2) | Redeemable preferred stock      
Assets      
Fixed income securities: 22 22  
Recurring | Significant unobservable inputs (Level 3)      
Assets      
Fixed income securities: 370 325  
Equity securities 303 341  
Short-term investments 40 30  
Other investments: Free-standing derivatives 1 1  
Separate account assets 0 0  
Other assets 0 0  
Total assets at fair value 714 697  
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: 68 70  
Recurring | Significant unobservable inputs (Level 3) | Corporate - public      
Assets      
Fixed income securities: 90 70  
Recurring | Significant unobservable inputs (Level 3) | Corporate - privately placed      
Assets      
Fixed income securities: 90 90  
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: 6 6  
Recurring | Significant unobservable inputs (Level 3) | ABS - consumer and other      
Assets      
Fixed income securities: 81 63  
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: 35 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 39    
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 (251) $ (224)  
Fair value      
Assets      
Total assets at fair value $ 71,349    
% of total assets at fair value 100.00% 100.00%  
Liabilities      
Total recurring basis liabilities $ (297) $ (281)  
Liabilities as a percent of liabilities measured at fair value 100.00% 100.00%  
Fair value | Recurring      
Assets      
Fixed income securities: $ 58,202 $ 57,170  
Equity securities 5,802 5,036  
Short-term investments 4,157 3,027  
Other investments: Free-standing derivatives 98 117  
Separate account assets 3,050 2,805  
Other assets 1 2  
Total assets at fair value 71,310 68,157  
Liabilities      
Other liabilities: Free-standing derivatives (46) (57)  
Fair value | Recurring | U.S. government and agencies      
Assets      
Fixed income securities: 3,892 5,517  
Fair value | Recurring | Municipal      
Assets      
Fixed income securities: 9,264 9,169  
Fair value | Recurring | Corporate - public      
Assets      
Fixed income securities: 31,072 29,270  
Fair value | Recurring | Corporate - privately placed      
Assets      
Fixed income securities: 11,627 10,866  
Fair value | Recurring | Foreign government      
Assets      
Fixed income securities: 752 747  
Fair value | Recurring | ABS - CDO      
Assets      
Fixed income securities: 256 269  
Fair value | Recurring | ABS - consumer and other      
Assets      
Fixed income securities: 802 776  
Fair value | Recurring | Residential mortgage-backed securities (“RMBS”)      
Assets      
Fixed income securities: 442 464  
Fair value | Recurring | Commercial mortgage-backed securities (“CMBS”)      
Assets      
Fixed income securities: 73 70  
Fair value | Recurring | Redeemable preferred stock      
Assets      
Fixed income securities: 22 22  
Fair value | Non-recurring      
Assets      
Total assets at fair value 39    
Liabilities      
Limited partnership interests 3    
Bank loans 36    
Fair value | Derivatives embedded in life and annuity contracts | Recurring      
Liabilities      
Contractholder funds: Derivatives embedded in life and annuity contracts (251) (224)  
Fixed Income Securities Valued Based on Nonbinding Broker Quotes      
Assets      
Total assets at fair value 127 105  
Municipal Not Rated by Third Party Credit Rating Agencies      
Assets      
Total assets at fair value $ 41 $ 44