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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
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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

X
- Definition Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. + References No definition available. + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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