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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost $ 104,461   $ 82,907      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,802   1,201      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 6,529   6,393      
Fixed maturity securities, available-for-sale $ 99,573 [1]   $ 77,617 [2]      
% of Total 100.00%   100.00%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 161 $ 132 $ 98 $ 120 $ 111 $ 75
Corporate Debt Securities [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 69,884   54,705      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,198   642      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,764   4,274      
Fixed maturity securities, available-for-sale $ 67,177 [1]   $ 50,991 [2]      
% of Total 67.50%   65.70%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 141 112 $ 82 104 95 62
Canadian and Canadian provincial governments            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 4,811   4,655      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 362   412      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 75   51      
Fixed maturity securities, available-for-sale $ 5,098 [1]   $ 5,016 [2]      
% of Total 5.10%   6.50%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
Residential mortgage-backed securities            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 1,793   1,412      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 24   12      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 77   107      
Fixed maturity securities, available-for-sale $ 1,740 [1]   $ 1,317 [2]      
% of Total 1.70%   1.70%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
Asset-backed Securities [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 7,001   5,197      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 54   42      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 164   184      
Fixed maturity securities, available-for-sale $ 6,872 [1]   $ 5,040 [2]      
% of Total 6.90%   6.50%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 19 19 $ 15 15 15 12
Commercial Mortgage Backed Securities [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 2,026   2,344      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 28   22      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 61   98      
Fixed maturity securities, available-for-sale $ 1,992 [1]   $ 2,267 [2]      
% of Total 2.00%   2.90%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 1 $ 1 $ 1 $ 1 $ 1 $ 1
US Treasury and Government [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 4,032   2,734      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 28   11      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 246   281      
Fixed maturity securities, available-for-sale $ 3,814 [1]   $ 2,464 [2]      
% of Total 3.80%   3.20%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
US States and Political Subdivisions Debt Securities [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 736   789      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4   3      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 80   99      
Fixed maturity securities, available-for-sale $ 660 [1]   $ 693 [2]      
% of Total 0.70%   0.90%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
Debt Security, Government, Non-US [Member]            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 7,372   5,752      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 104   56      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 418   424      
Fixed maturity securities, available-for-sale $ 7,058 [1]   $ 5,384 [2]      
% of Total 7.10%   6.90%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
JAPAN            
Debt Securities, Available-for-sale [Line Items]            
Available for Sale at Fair value - Amortized cost 6,806   5,319      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0   1      
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,644   875      
Fixed maturity securities, available-for-sale $ 5,162   $ 4,445      
% of Total 5.20%   5.70%      
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 0   $ 0      
[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of September 30, 2025, the fair value of such investments was $940 million.
[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2024, the fair value of such investments was $966 million