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Investments (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
position
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
position
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
position
Dec. 31, 2020
USD ($)
position
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Investment Narrative [Line Items]                          
Funds withheld at interest $ 6,954       $ 5,432       $ 6,954 $ 5,432      
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00%       100.00%       100.00% 100.00%      
Mortgage Loan Carrying Value Payout Adjusted Due To COVID-19                 $ 10 $ 660      
Funds Held Under Reinsurance Agreements Asset Specific Client $ 4,600               4,600        
Available for Sale at Fair value - Amortized cost 55,873       $ 49,548       55,873 49,548      
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) $ 60,749       $ 56,735       $ 60,749 $ 56,735      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | position 1,862,000       877       1,862,000 877      
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships                 $ 92        
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships                 70        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 57 $ (34) $ 482 $ 186 $ 169 $ 285 $ 195 $ (96) 691 $ 553 $ 1,132    
Revision of Prior Period, Reclassification, Adjustment                          
Investment Narrative [Line Items]                          
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                   102 (2) $ 1 $ 10
Non-Income Producing Securities [Member]                          
Investment Narrative [Line Items]                          
Available for Sale at Fair value - Amortized cost 26       71       26 71      
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) 26       63       26 63      
Canadian Province Of Quebec Securities [Member]                          
Investment Narrative [Line Items]                          
Available for Sale at Fair value - Amortized cost 1,092       1,054       1,092 1,054      
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) 1,451       1,528       1,451 1,528      
Collateral Received Fixed Maturity Securities [Member]                          
Investment Narrative [Line Items]                          
Available-for-sale at fair value (amortized cost of $55,873 and $49,548; allowance for credit losses of $31 and $20) 1,922       1,784       1,922 1,784      
Carrying Value [Member]                          
Investment Narrative [Line Items]                          
Funds withheld at interest [1] $ 6,747       $ 5,292       $ 6,747 5,292      
CALIFORNIA                          
Investment Narrative [Line Items]                          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.40%               13.40%        
TEXAS                          
Investment Narrative [Line Items]                          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 12.50%               12.50%        
GEORGIA                          
Investment Narrative [Line Items]                          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 7.80%               7.80%        
Canada Segment Reporting Information [Member]                          
Investment Narrative [Line Items]                          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 3.00%               3.00%        
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest                 $ 143 $ 155 $ 183    
UNITED KINGDOM                          
Investment Narrative [Line Items]                          
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 2.30%               2.30%        
[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.