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Investments Investments (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
position
Dec. 31, 2018
USD ($)
position
Dec. 31, 2017
USD ($)
Investment Narrative [Line Items]      
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash $ 1 $ 29  
Net Amount Assets Liabilities From Repurchase Reverse Repurchase Agreements 1 0  
Available-for-sale Securities, Amortized Cost Basis 29,205 24,006  
Available-for-sale Securities $ 31,393 $ 23,982  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | position 1,072 3,109  
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments $ 50 $ 159 $ 37
Securities for Reverse Repurchase Agreements $ 356 $ 554  
Percentage Of Total Gross Unrealized Losses 100.00% 100.00%  
Funds withheld at interest $ 5,662 $ 5,761  
Funds Held Under Reinsurance Agreements Asset Specific Client $ 3,500    
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%  
Non-Income Producing Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis $ 47 $ 41  
Available-for-sale Securities 51 43  
Canadian Province Of Quebec Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities, Amortized Cost Basis 1,014 914  
Available-for-sale Securities 1,379 1,188  
Collateral Received Fixed Maturity Securities [Member]      
Investment Narrative [Line Items]      
Available-for-sale Securities 727 617  
Reported Value Measurement [Member]      
Investment Narrative [Line Items]      
Securities Borrowed 339 336  
Funds withheld at interest [1] $ 5,526 $ 5,655  
CALIFORNIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 15.50%    
TEXAS      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.50%    
GEORGIA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.40%    
CANADA      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 3.20%    
UNITED KINGDOM      
Investment Narrative [Line Items]      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 1.00%    
[1]
Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.