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Investments - Fixed Maturity Securities and Short Term Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]            
Percent of Total 100.00%   100.00%      
Amortized Cost $ 7,506   $ 7,822      
Allowance for Credit Losses (57) $ (51) (42) $ (35) $ (39) $ (78)
Gross Unrealized Gains 48   478      
Gross Unrealized Losses (717)   (56)      
Estimated Fair Value 6,780   8,202      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (129)   $ (30)      
Government agency obligations as a percentage of total mortgage backed securities 29.00%   31.00%      
Obligations of state and political subdivisions            
Schedule of Investments [Line Items]            
Percent of Total 43.00%   43.00%      
Amortized Cost $ 3,264   $ 3,386      
Allowance for Credit Losses (13)   (12)      
Gross Unrealized Gains 23   290      
Gross Unrealized Losses (173)   (4)      
Estimated Fair Value 3,101   3,660      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (3)   $ 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 2   7      
Gross Unrealized Losses (9)   (2)      
Estimated Fair Value 115   128      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0      
Corporate securities            
Schedule of Investments [Line Items]            
Percent of Total 32.00%   32.00%      
Amortized Cost $ 2,405   $ 2,516      
Allowance for Credit Losses (4)   (1)      
Gross Unrealized Gains 0   111      
Gross Unrealized Losses (401)   (21)      
Estimated Fair Value 2,000   2,605      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (80)   $ (4)      
RMBS            
Schedule of Investments [Line Items]            
Percent of Total 6.00%   6.00%      
Amortized Cost $ 432   $ 454      
Allowance for Credit Losses (19)   (17)      
Gross Unrealized Gains 3   24      
Gross Unrealized Losses (55)   (24)      
Estimated Fair Value 361   437      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (44)   $ (24)      
CMBS            
Schedule of Investments [Line Items]            
Percent of Total 4.00%   4.00%      
Amortized Cost $ 291   $ 332      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   14      
Gross Unrealized Losses (11)   0      
Estimated Fair Value 280   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 $ 445   $ 457      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   1      
Gross Unrealized Losses (31)   0      
Estimated Fair Value 414   458      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0      
Others            
Schedule of Investments [Line Items]            
Percent of Total 6.00%   5.00%      
Amortized Cost $ 425   $ 420      
Allowance for Credit Losses (21)   (12)      
Gross Unrealized Gains 20   26      
Gross Unrealized Losses (4)   (2)      
Estimated Fair Value 420   432      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ (2)   $ (2)      
Non-U.S. government securities            
Schedule of Investments [Line Items]            
Percent of Total 1.00%   2.00%      
Amortized Cost $ 122   $ 134      
Allowance for Credit Losses 0   0      
Gross Unrealized Gains 0   5      
Gross Unrealized Losses (33)   (3)      
Estimated Fair Value 89   136      
AOCI Pre-tax Gain (Loss) on Securities with Credit Loss $ 0   $ 0