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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | $ 65,827 | [1] | $ 60,467 | [2]
Equity Method Investments, Fair Value Disclosure | 144 | [1] | 139 | [2]
Funds withheld at interest embedded derivatives | (284) | [1] | (377) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 55 | [1] | 54 | [2]
Cash and cash equivalents | 2,698 | [1] | 1,335 | [2]
Short-term investments | 280 | [1] | 187 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 70 | [1] | 97 | [2]
Investments, Fair Value Disclosure | 90 | [1] | 119 | [2]
Assets, Fair Value Disclosure | 68,810 | [1] | 61,924 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 398 |  | 415 |
Derivative Liability | 190 |  | 206 |
Funds Held under Reinsurance Agreements, Liability | (4,409) |  | (4,483) |
Other liabilities | (294) |  | (197) |
Financial Liabilities Fair Value Disclosure | 502 |  | 406 |
Fair Value, Net Asset (Liability) | 893 |  | 856 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 20 | [1] | 22 | [2]
Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 41,048 | [1] | 38,755 | [2]
Canadian and Canadian provincial governments |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,713 | [1] | 3,917 | [2]
Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,150 | [1] | 1,079 | [2]
Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 4,945 | [1] | 4,429 | [2]
Assets, Fair Value Disclosure | 292 |  | 268 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,861 | [1] | 1,773 | [2]
US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,786 | [1] | 2,520 | [2]
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,116 | [1] | 1,114 | [2]
Debt Security, Government, Non-US [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 4,004 | [1] | 3,749 | [2]
Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 5,204 | [1] | 3,131 | [2]
Fair Value Inputs Level 1 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,694 | [1] | 2,426 | [2]
Equity Method Investments, Fair Value Disclosure | 75 | [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 | 2,698 | [1] | 1,322 | [2]
Short-term investments | 178 | [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 | 5,645 | [1] | 3,907 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Derivative Liability | 0 |  | 0 |
Other liabilities | 0 |  | 0 |
Financial Liabilities Fair Value Disclosure | 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 | 2,694 | [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 | 56,596 | [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 | 92 | [1] | 95 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 70 | [1] | 97 | [2]
Investments, Fair Value Disclosure | 90 | [1] | 119 | [2]
Assets, Fair Value Disclosure | 56,778 | [1] | 51,849 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Derivative Liability | 0 |  | 0 |
Other liabilities | (294) |  | (197) |
Financial Liabilities Fair Value Disclosure | 294 |  | 197 |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 20 | [1] | 22 | [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 35,969 | [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 | 3,713 | [1] | 3,917 | [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,149 | [1] | 1,078 | [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,580 | [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 | 1,829 | [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 | 86 | [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 | 1,095 | [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 | 3,971 | [1] | 3,714 | [2]
Fair Value Inputs Level 2 Member | Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 5,204 | [1] | 3,131 | [2]
Fair Value Inputs Level 3 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 6,537 | [1] | 6,419 | [2]
Equity Method Investments, Fair Value Disclosure | 69 | [1] | 70 | [2]
Funds withheld at interest embedded derivatives | (284) | [1] | (377) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 55 | [1] | 54 | [2]
Cash and cash equivalents | 0 | [1] | 0 | [2]
Short-term investments | 10 | [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 | 6,387 | [1] | 6,168 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 398 |  | 415 |
Derivative Liability | 190 |  | 206 |
Other liabilities | 0 |  | 0 |
Financial Liabilities Fair Value Disclosure | 208 |  | 209 |
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 | 5,079 | [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 | [1] | 1 | [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,365 | [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 | 32 | [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 | 21 | [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 | 33 | [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 March 31, 2024, the fair value of such investments was $893 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

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- 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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