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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, 2025
Dec. 31, 2024
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale $ 99,573 [1] $ 77,617 [2]
Equity Method Investments, Fair Value Disclosure 161 [1] 155 [2]
Funds withheld at interest embedded derivatives (208) [1] (215) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 59 [1] 56 [2]
Cash and cash equivalents 2,627 [1] 2,055 [2]
Short-term investments 331 [1] 313 [2]
Derivative Assets (Liabilities), at Fair Value, Net 223 [1] 121 [2]
Investments, Fair Value Disclosure 239 [1] 138 [2]
Assets, Fair Value Disclosure 102,786 [1] 80,121 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 438 435
Funds Held under Reinsurance Agreements, Liability (5,277) (5,017)
Other liabilities (422) (486)
Financial Liabilities Fair Value Disclosure 748 761
Fair Value, Net Asset (Liability) 940 966
Derivative Liability (112) (160)
Derivative Asset 4 2
Fair Value Option Contractholder Directed Unit Linked Investments [Member]    
Assets Fair Value Disclosure    
Investments, Fair Value Disclosure 16 [1] 17 [2]
Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 67,177 [1] 50,991 [2]
Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,098 [1] 5,016 [2]
Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,740 [1] 1,317 [2]
Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6,872 [1] 5,040 [2]
Assets, Fair Value Disclosure 1,026 564
Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,992 [1] 2,267 [2]
US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,814 [1] 2,464 [2]
US States and Political Subdivisions Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 660 [1] 693 [2]
Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 7,058 [1] 5,384 [2]
Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,162 [1] 4,445 [2]
Fair Value Inputs Level 1 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 3,602 [1] 2,379 [2]
Equity Method Investments, Fair Value Disclosure 67 [1] 67 [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 2,618 [1] 2,053 [2]
Short-term investments 225 [1] 175 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 6,512 [1] 4,674 [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
Derivative Asset 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 3,602 [1] 2,379 [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 83,177 [1] 66,550 [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 9 [1] 2 [2]
Short-term investments 81 [1] 127 [2]
Derivative Assets (Liabilities), at Fair Value, Net 223 [1] 121 [2]
Investments, Fair Value Disclosure 239 [1] 138 [2]
Assets, Fair Value Disclosure 83,506 [1] 66,817 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 0 0
Other liabilities (419) (484)
Financial Liabilities Fair Value Disclosure 419 484
Derivative Liability 0 0
Derivative Asset 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 16 [1] 17 [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 57,440 [1] 44,137 [2]
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,098 [1] 5,016 [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 4,004 [1] 1,317 [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,952 [1] 3,254 [2]
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 1,722 [1] 2,254 [2]
Fair Value Inputs Level 2 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 208 [1] 80 [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 660 [1] 693 [2]
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 6,931 [1] 5,354 [2]
Fair Value Inputs Level 2 Member | Japanese Government    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 5,162 [1] 4,445 [2]
Fair Value Inputs Level 3 Member    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 12,794 [1] 8,688 [2]
Equity Method Investments, Fair Value Disclosure 94 [1] 88 [2]
Funds withheld at interest embedded derivatives (208) [1] (215) [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure 59 [1] 56 [2]
Cash and cash equivalents 0 [1] 0 [2]
Short-term investments 25 [1] 11 [2]
Derivative Assets (Liabilities), at Fair Value, Net 0 [1] 0 [2]
Investments, Fair Value Disclosure 0 [1] 0 [2]
Assets, Fair Value Disclosure 12,768 [1] 8,630 [2]
Liabilities Fair Value Disclosure    
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives 438 435
Other liabilities (3) (2)
Financial Liabilities Fair Value Disclosure 329 277
Derivative Liability (112) (160)
Derivative Asset 4 2
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 9,737 [1] 6,854 [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 2,868 [1] 0 [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 40 [1] 1,786 [2]
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 18 [1] 13 [2]
Fair Value Inputs Level 3 Member | US Treasury and Government [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 4 [1] 5 [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] 0 [2]
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member]    
Assets Fair Value Disclosure    
Fixed maturity securities, available-for-sale 127 [1] 30 [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, 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