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Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 78,149 [1] $ 60,467 [2]
Equity Method Investments, Fair Value Disclosure 155 [1] 139 [2]
Funds withheld at interest embedded derivatives (231) [1] (377) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 60 [1] 54 [2]
Cash and cash equivalents 3,530 [1] 1,335 [2]
Short-term investments 345 [1] 187 [2]
Derivative Assets (Liabilities), at Fair Value, Net 199 [1] 97 [2]
Investments, Fair Value Disclosure 218 [1] 119 [2]
Assets, Fair Value Disclosure 82,226 [1] 61,924 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 385 415
Funds Held under Reinsurance Agreements, Liability (4,809) (4,483)
Other liabilities (216) (197)
Financial Liabilities Fair Value Disclosure 550 406
Fair Value, Net Asset (Liability) 921 856
Derivative Liability (51) (206)
Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 19 [1] 22 [2]
Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 51,087 [1] 38,755 [2]
Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 4,970 [1] 3,917 [2]
Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,318 [1] 1,079 [2]
Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,373 [1] 4,429 [2]
Assets, Fair Value Disclosure 285 268
Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,238 [1] 1,773 [2]
US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,703 [1] 2,520 [2]
US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 821 [1] 1,114 [2]
Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,369 [1] 3,749 [2]
Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,270 [1] 3,131 [2]
Fair Value Inputs Level 1 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,608 [1] 2,426 [2]
Equity Method Investments, Fair Value Disclosure 73 [1] 69 [2]
Funds withheld at interest embedded derivatives 0 [1] 0 [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 0 [1] 0 [2]
Cash and cash equivalents 3,530 [1] 1,322 [2]
Short-term investments 160 [1] 90 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 5,371 [1] 3,907 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Other liabilities 0 0
Financial Liabilities Fair Value Disclosure 0 0
Derivative Liability 0 0
Fair Value Inputs Level 1 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,608 [1] 2,426 [2]
Fair Value Inputs Level 1 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 1 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 2 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 68,802 [1] 51,622 [2]
Equity Method Investments, Fair Value Disclosure 0 [1] 0 [2]
Funds withheld at interest embedded derivatives 0 [1] 0 [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 0 [1] 0 [2]
Cash and cash equivalents 0 [1] 13 [2]
Short-term investments 174 [1] 95 [2]
Derivative Assets (Liabilities), at Fair Value, Net 199 [1] 97 [2]
Investments, Fair Value Disclosure 218 [1] 119 [2]
Assets, Fair Value Disclosure 69,194 [1] 51,849 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Other liabilities (216) (197)
Financial Liabilities Fair Value Disclosure 216 197
Derivative Liability 0 0
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 19 [1] 22 [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 44,944 [1] 33,822 [2]
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 4,970 [1] 3,917 [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,851 [1] 1,078 [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 2,204 [1] 3,064 [2]
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,318 [1] 1,714 [2]
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 89 [1] 87 [2]
Fair Value Inputs Level 2 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 821 [1] 1,095 [2]
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,335 [1] 3,714 [2]
Fair Value Inputs Level 2 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,270 [1] 3,131 [2]
Fair Value Inputs Level 3 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,739 [1] 6,419 [2]
Equity Method Investments, Fair Value Disclosure 82 [1] 70 [2]
Funds withheld at interest embedded derivatives (231) [1] (377) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 60 [1] 54 [2]
Cash and cash equivalents 0 [1] 0 [2]
Short-term investments 11 [1] 2 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 7,661 [1] 6,168 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 385 415
Other liabilities 0 0
Financial Liabilities Fair Value Disclosure 334 209
Derivative Liability (51) (206)
Fair Value Inputs Level 3 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6,143 [1] 4,933 [2]
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 0 [2]
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,522 [1] 1 [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 34 [1] 1,365 [2]
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 59 [2]
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6 [1] 7 [2]
Fair Value Inputs Level 3 Member | US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 0 [1] 19 [2]
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 34 [1] 35 [2]
Fair Value Inputs Level 3 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 0 [1] $ 0 [2]
[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