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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | $ 56,085 | [1] | $ 52,901 | [2]
Equity Method Investments, Fair Value Disclosure | 138 | [1] | 134 | [2]
Funds withheld at interest embedded derivatives | (322) | [1] | (371) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 53 | [1] | 54 | [2]
Cash and cash equivalents | 1,654 | [1] | 1,535 | [2]
Short-term investments | 203 | [1] | 121 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 100 | [1] | 170 | [2]
Investments, Fair Value Disclosure | 124 | [1] | 193 | [2]
Assets, Fair Value Disclosure | 57,935 | [1] | 54,567 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 495 |  | 530 |
Funds Held under Reinsurance Agreements, Liability | (351) |  | (363) |
Other liabilities | (189) |  | (183) |
Financial Liabilities Fair Value Disclosure | 333 |  | 350 |
Fair Value, Net Asset (Liability) | 726 |  |  |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 24 | [1] | 23 | [2]
Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 35,477 | [1] | 33,969 | [2]
Canadian and Canadian provincial governments |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,755 | [1] | 3,626 | [2]
Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,024 | [1] | 941 | [2]
Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 4,103 | [1] | 3,878 | [2]
Assets, Fair Value Disclosure | 272 |  | 274 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,670 | [1] | 1,623 | [2]
US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,745 | [1] | 1,482 | [2]
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,138 | [1] | 1,119 | [2]
Debt Security, Government, Non-US [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,730 | [1] | 3,704 | [2]
Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,443 | [1] | 2,559 | [2]
Fair Value Inputs Level 1 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,649 | [1] | 1,388 | [2]
Equity Method Investments, Fair Value Disclosure | 70 | [1] | 68 | [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 | 1,653 | [1] | 1,535 | [2]
Short-term investments | 118 | [1] | 54 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 0 | [1] | 0 | [2]
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Assets, Fair Value Disclosure | 3,490 | [1] | 3,045 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Funds Held under Reinsurance Agreements, 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 | 1,649 | [1] | 1,388 | [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 | 48,297 | [1] | 45,791 | [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] | 0 | [2]
Short-term investments | 78 | [1] | 54 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 100 | [1] | 170 | [2]
Investments, Fair Value Disclosure | 124 | [1] | 193 | [2]
Assets, Fair Value Disclosure | 48,499 | [1] | 46,038 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Funds Held under Reinsurance Agreements, Liability | 0 |  | 0 |
Other liabilities | (189) |  | (183) |
Financial Liabilities Fair Value Disclosure | 189 |  | 183 |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 24 | [1] | 23 | [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 30,864 | [1] | 29,670 | [2]
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,755 | [1] | 3,626 | [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,023 | [1] | 931 | [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,699 | [1] | 2,603 | [2]
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,614 | [1] | 1,555 | [2]
Fair Value Inputs Level 2 Member | US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 88 | [1] | 85 | [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 | 1,118 | [1] | 1,093 | [2]
Fair Value Inputs Level 2 Member | Debt Security, Government, Non-US [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,693 | [1] | 3,669 | [2]
Fair Value Inputs Level 2 Member | Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,443 | [1] | 2,559 | [2]
Fair Value Inputs Level 3 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 6,139 | [1] | 5,722 | [2]
Equity Method Investments, Fair Value Disclosure | 68 | [1] | 66 | [2]
Funds withheld at interest embedded derivatives | (322) | [1] | (371) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 53 | [1] | 54 | [2]
Cash and cash equivalents | 1 | [1] | 0 | [2]
Short-term investments | 7 | [1] | 13 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 0 | [1] | 0 | [2]
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Assets, Fair Value Disclosure | 5,946 | [1] | 5,484 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 495 |  | 530 |
Funds Held under Reinsurance Agreements, Liability | (351) |  | (363) |
Other liabilities | 0 |  | 0 |
Financial Liabilities Fair Value Disclosure | 144 |  | 167 |
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 | 4,613 | [1] | 4,299 | [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] | 10 | [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,404 | [1] | 1,275 | [2]
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 56 | [1] | 68 | [2]
Fair Value Inputs Level 3 Member | US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 8 | [1] | 9 | [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 | 20 | [1] | 26 | [2]
Fair Value Inputs Level 3 Member | Debt Security, Government, Non-US [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 37 | [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, 2023, the fair value of such investments was $726 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

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