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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost $ 81,606 $ 64,977
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,755 1,125
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 5,092 5,560
Fixed maturity securities, available-for-sale $ 78,149 [1] $ 60,467 [2]
% of Total 100.00% 100.00%
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 120 $ 75
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 53,327 42,014
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,058 554
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,194 3,751
Fixed maturity securities, available-for-sale $ 51,087 [1] $ 38,755 [2]
% of Total 65.40% 64.10%
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 104 $ 62
Canadian and Canadian provincial governments    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 4,517 3,477
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 494 473
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 41 33
Fixed maturity securities, available-for-sale $ 4,970 [1] $ 3,917 [2]
% of Total 6.40% 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 1,374 1,173
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 20 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 76 102
Fixed maturity securities, available-for-sale $ 1,318 [1] $ 1,079 [2]
% of Total 1.70% 1.80%
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 5,521 4,661
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 44 19
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 177 239
Fixed maturity securities, available-for-sale $ 5,373 [1] $ 4,429 [2]
% of Total 6.90% 7.30%
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 15 $ 12
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 2,327 1,969
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 27 7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 115 202
Fixed maturity securities, available-for-sale $ 2,238 [1] $ 1,773 [2]
% of Total 2.90% 2.90%
Debt Securities, Available-for-Sale, Allowance for Credit Loss $ 1 $ 1
US Treasury and Government [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 1,897 2,725
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 18 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 212 214
Fixed maturity securities, available-for-sale $ 1,703 [1] $ 2,520 [2]
% of Total 2.10% 4.20%
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 895 1,236
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7 7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 81 129
Fixed maturity securities, available-for-sale $ 821 [1] $ 1,114 [2]
% of Total 1.10% 1.80%
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 5,645 4,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 84 45
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 360 388
Fixed maturity securities, available-for-sale $ 5,369 [1] $ 3,749 [2]
% of Total 6.80% 6.20%
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 6,103 3,630
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 836 502
Fixed maturity securities, available-for-sale $ 5,270 $ 3,131
% of Total 6.70% 5.20%
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, 2024, the fair value of such investments was $921 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, 2023, the fair value of such investments was $856 million