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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Financing Receivable, Allowance for Credit Loss $ 75 $ 37
Available for Sale at Fair value - Amortized cost 64,977 59,663
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 60,467 [1] $ 52,901 [2]
Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 100.00% 100.00%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 5,560 $ 7,319
Available for Sale at Fair value - Amortized cost 64,977 59,663
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 60,467 52,901
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,125 594
Debt Securities, Available-for-Sale, Allowance for Credit Loss 75 37
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale at Fair value - Amortized cost 42,014 38,963
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 38,755 [1] $ 33,969 [2]
Corporate Debt Securities [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 64.10% 64.20%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 3,751 $ 5,135
Available for Sale at Fair value - Amortized cost 42,014 38,963
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 38,755 33,969
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 554 168
Debt Securities, Available-for-Sale, Allowance for Credit Loss 62 27
Canadian Provincial Governments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 3,917 [1] $ 3,626 [2]
Canadian Provincial Governments [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 6.50% 6.90%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 33 $ 66
Available for Sale at Fair value - Amortized cost 3,477 3,311
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 3,917 3,626
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 473 381
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0 0
Residential Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 1,079 [1] $ 941 [2]
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 7.30% 7.30%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 239 $ 440
Available for Sale at Fair value - Amortized cost 4,661 4,324
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 4,429 3,878
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 19 4
Debt Securities, Available-for-Sale, Allowance for Credit Loss 12 10
Asset-backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 4,429 [1] $ 3,878 [2]
Asset-backed Securities [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 2.90% 3.10%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 202 $ 212
Available for Sale at Fair value - Amortized cost 1,969 1,835
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 1,773 1,623
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7 0
Debt Securities, Available-for-Sale, Allowance for Credit Loss 1 0
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 1,773 [1] $ 1,623 [2]
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 1.80% 1.80%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 102 $ 114
Available for Sale at Fair value - Amortized cost 1,173 1,054
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 1,079 941
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8 1
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0 0
US Treasury and Government [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 2,520 [1] $ 1,482 [2]
US Treasury and Government [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 4.20% 2.80%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 214 $ 212
Available for Sale at Fair value - Amortized cost 2,725 1,690
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 2,520 1,482
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 9 4
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]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 1,114 [1] $ 1,119 [2]
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 1.80% 2.10%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 129 $ 173
Available for Sale at Fair value - Amortized cost 1,236 1,282
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 1,114 1,119
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 7 10
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0 0
Debt Security, Government, Non-US [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 3,749 [1] $ 3,704 [2]
Debt Security, Government, Non-US [Member] | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 6.20% 7.00%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 388 $ 489
Available for Sale at Fair value - Amortized cost 4,092 4,171
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 3,749 3,704
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 45 22
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0 0
Japanese Government Debt Securities Member    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) $ 3,131 $ 2,559
Japanese Government Debt Securities Member | Fixed Maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Percentage Of Total Available For Sale Securities 5.20% 4.80%
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 502 $ 478
Available for Sale at Fair value - Amortized cost 3,630 3,033
Fixed maturity securities available-for-sale at fair value (amortized cost of $64,977 and $59,663; allowance for credit losses of $75 and $37) 3,131 2,559
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3 4
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 December 31, 2023, the fair value of such investments was $856 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, 2022, the fair value of such investments was $683 million.