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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | $ 54,171 | [1] | $ 52,901 | [2]
Equity Method Investments, Fair Value Disclosure | 133 | [1] | 134 | [2]
Funds withheld at interest embedded derivatives | (359) | [1] | (371) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 51 | [1] | 54 | [2]
Cash and cash equivalents | 1,579 | [1] | 1,535 | [2]
Short-term investments | 107 | [1] | 121 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 75 | [1] | 170 | [2]
Investments, Fair Value Disclosure | 93 | [1] | 193 | [2]
Assets, Fair Value Disclosure | 55,775 | [1] | 54,567 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 441 |  | 530 |
Funds Held under Reinsurance Agreements, Liability | (369) |  | (363) |
Other liabilities | (372) |  | (183) |
Financial Liabilities Fair Value Disclosure | 444 |  | 350 |
Fair Value, Net Asset (Liability) | 818 |  |  |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 18 | [1] | 23 | [2]
Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 35,503 | [1] | 33,969 | [2]
Canadian and Canadian provincial governments |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,348 | [1] | 3,626 | [2]
Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,030 | [1] | 941 | [2]
Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 4,236 | [1] | 3,878 | [2]
Assets, Fair Value Disclosure | 266 |  | 274 |
Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,710 | [1] | 1,623 | [2]
US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,060 | [1] | 1,482 | [2]
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,047 | [1] | 1,119 | [2]
Debt Security, Government, Non-US [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 3,522 | [1] | 3,704 | [2]
Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,715 | [1] | 2,559 | [2]
Fair Value Inputs Level 1 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 972 | [1] | 1,388 | [2]
Equity Method Investments, Fair Value Disclosure | 65 | [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 | 1,578 | [1] | 1,535 | [2]
Short-term investments | 34 | [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 | 2,649 | [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 | 972 | [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 | 47,199 | [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 | 1 | [1] | 0 | [2]
Short-term investments | 65 | [1] | 54 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 75 | [1] | 170 | [2]
Investments, Fair Value Disclosure | 93 | [1] | 193 | [2]
Assets, Fair Value Disclosure | 47,358 | [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 | (372) |  | (183) |
Financial Liabilities Fair Value Disclosure | 372 |  | 183 |
Fair Value Inputs Level 2 Member | Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Investments, Fair Value Disclosure | 18 | [1] | 23 | [2]
Fair Value Inputs Level 2 Member | Corporate Debt Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 30,888 | [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 | 3,348 | [1] | 3,626 | [2]
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,968 | [1] | 931 | [2]
Fair Value Inputs Level 2 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 1,654 | [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 | 1,029 | [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 | 81 | [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 | 1,027 | [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 | 3,489 | [1] | 3,669 | [2]
Fair Value Inputs Level 2 Member | Japanese Government |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 2,715 | [1] | 2,559 | [2]
Fair Value Inputs Level 3 Member |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 6,000 | [1] | 5,722 | [2]
Equity Method Investments, Fair Value Disclosure | 68 | [1] | 66 | [2]
Funds withheld at interest embedded derivatives | (359) | [1] | (371) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 51 | [1] | 54 | [2]
Cash and cash equivalents | 0 | [1] | 0 | [2]
Short-term investments | 8 | [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 | 5,768 | [1] | 5,484 | [2]
Liabilities Fair Value Disclosure |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 441 |  | 530 |
Funds Held under Reinsurance Agreements, Liability | (369) |  | (363) |
Other liabilities | 0 |  | 0 |
Financial Liabilities Fair Value Disclosure | 72 |  | 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 | 4,615 | [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 | 1,268 | [1] | 10 | [2]
Fair Value Inputs Level 3 Member | Asset-backed Securities [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 56 | [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 | 1 | [1] | 68 | [2]
Fair Value Inputs Level 3 Member | US Treasury and Government [Member] |  |  |  |
Assets Fair Value Disclosure |  |  |  |
Fixed maturity securities, available-for-sale | 7 | [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 | 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 September 30, 2023, the fair value of such investments was $818 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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