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Investments - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized Cost $ 7,803   $ 7,822      
Allowance for Credit Losses (51) $ (47) (42) $ (39) $ (81) $ (78)
Gross Unrealized Gains 88   478      
Gross Unrealized Losses (444)   (56)      
Estimated Fair Value 7,396   8,202      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (132)   $ (30)      
Government agency obligations as a percentage of total mortgage backed securities 31.00%   31.00%      
Obligations of state and political subdivisions            
Schedule of Investments [Line Items]            
Percent of Total 45.00%   43.00%      
Amortized Cost $ 3,542   $ 3,386      
Allowance for Credit Losses (14)   (12)      
Gross Unrealized Gains 57   290      
Gross Unrealized Losses (101)   (4)      
Estimated Fair Value 3,484   3,660      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (5)   $ 0      
U.S. government and agencies            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   2.00%      
Amortized Cost $ 122   $ 123      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 3   7      
Gross Unrealized Losses (6)   (2)      
Estimated Fair Value 119   128      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0      
Corporate securities            
Schedule of Investments [Line Items]            
Percent of Total 31.00%   32.00%      
Amortized Cost $ 2,434   $ 2,516      
Allowance for Credit Losses (4)   (1)      
Gross Unrealized Gains 3   111      
Gross Unrealized Losses (239)   (21)      
Estimated Fair Value 2,194   2,605      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (78)   $ (4)      
RMBS            
Schedule of Investments [Line Items]            
Percent of Total 5.00%   6.00%      
Amortized Cost $ 419   $ 454      
Allowance for Credit Losses (15)   (17)      
Gross Unrealized Gains 5   24      
Gross Unrealized Losses (40)   (24)      
Estimated Fair Value 369   437      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (35)   $ (24)      
CMBS            
Schedule of Investments [Line Items]            
Percent of Total 4.00%   4.00%      
Amortized Cost $ 303   $ 332      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   14      
Gross Unrealized Losses (5)   0      
Estimated Fair Value 298   346      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0      
CLOs and CLO warehouse assets:            
Schedule of Investments [Line Items]            
Percent of Total 6.00%   6.00%      
Amortized Cost $ 442   $ 457      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   1      
Gross Unrealized Losses (21)   0      
Estimated Fair Value 421   458      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0      
Others            
Schedule of Investments [Line Items]            
Percent of Total 5.00%   5.00%      
Amortized Cost $ 419   $ 420      
Allowance for Credit Losses (18)   (12)      
Gross Unrealized Gains 20   26      
Gross Unrealized Losses (13)   (2)      
Estimated Fair Value 408   432      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (12)   $ (2)      
Non-U.S. government securities            
Schedule of Investments [Line Items]            
Percent of Total 2.00%   2.00%      
Amortized Cost $ 122   $ 134      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   5      
Gross Unrealized Losses (19)   (3)      
Estimated Fair Value 103   136      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (2)   $ 0