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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 | Dec. 31, 2022 | Dec. 31, 2021
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Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | $ 52,901 | [1] | $ 60,749 | [2]
Equity Method Investments, Fair Value Disclosure | 134 | [1] | 151 | [2]
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | (370) | [1] | (104) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 54 | [1] | 83 | [2]
Cash and Cash Equivalents, Fair Value Disclosure | 1,535 | [1] | 1,138 | [2]
Fair Value Measured On Recurring Basis Short Term Investments | 121 | [1] | 64 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 170 | [1] | 175 | [2]
Investments, Fair Value Disclosure | 193 | [1] | 227 | [2]
Assets, Fair Value Disclosure | 54,568 | [1] | 62,516 | [2]
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 653 |  | 855 |
Funds Held under Reinsurance Agreements, Liability | (361) |  | (61) |
Other Liabilities, Fair Value Disclosure | 183 |  | 39 |
Financial Liabilities Fair Value Disclosure | 475 |  | 833 |
Fair Value, Net Asset (Liability) | 683 |  | 581 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,388 | [1] | 1,993 | [2]
Equity Method Investments, Fair Value Disclosure | 68 | [1] | 101 | [2]
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | 0 | [1] | 0 | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 0 | [1] | 0 | [2]
Cash and Cash Equivalents, Fair Value Disclosure | 1,535 | [1] | 1,138 | [2]
Fair Value Measured On Recurring Basis Short Term Investments | 54 | [1] | 0 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 0 | [1] | 0 | [2]
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Assets, Fair Value Disclosure | 3,045 | [1] | 3,232 | [2]
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Funds Held under Reinsurance Agreements, Liability | 0 |  | 0 |
Other Liabilities, Fair Value Disclosure | 0 |  |  |
Financial Liabilities Fair Value Disclosure | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 45,791 | [1] | 53,611 | [2]
Equity Method Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | 0 | [1] | 0 | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 0 | [1] | 0 | [2]
Cash and Cash Equivalents, Fair Value Disclosure | 0 | [1] | 0 | [2]
Fair Value Measured On Recurring Basis Short Term Investments | 54 | [1] | 36 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 170 | [1] | 175 | [2]
Investments, Fair Value Disclosure | 193 | [1] | 227 | [2]
Assets, Fair Value Disclosure | 46,038 | [1] | 53,874 | [2]
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 0 |  | 0 |
Funds Held under Reinsurance Agreements, Liability | 0 |  | 0 |
Other Liabilities, Fair Value Disclosure | 183 |  |  |
Financial Liabilities Fair Value Disclosure | 183 |  | 39 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 5,722 | [1] | 5,145 | [2]
Equity Method Investments, Fair Value Disclosure | 66 | [1] | 50 | [2]
Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives | (370) | [1] | (104) | [2]
Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure | 54 | [1] | 83 | [2]
Cash and Cash Equivalents, Fair Value Disclosure | 0 | [1] | 0 | [2]
Fair Value Measured On Recurring Basis Short Term Investments | 13 | [1] | 28 | [2]
Derivative Assets (Liabilities), at Fair Value, Net | 0 | [1] | 0 | [2]
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Assets, Fair Value Disclosure | 5,485 | [1] | 5,410 | [2]
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives | 653 |  | 855 |
Funds Held under Reinsurance Agreements, Liability | (361) |  | (61) |
Other Liabilities, Fair Value Disclosure | 0 |  |  |
Financial Liabilities Fair Value Disclosure | 292 |  | 794 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure |  |  | 0 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure |  |  | 39 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure |  |  | 0 |
Fair Value Option Contractholder Directed Unit Linked Investments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Investments, Fair Value Disclosure | 23 | [1] | 52 | [2]
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Investments, Fair Value Disclosure | 23 | [1] | 52 | [2]
Fair Value Option Contractholder Directed Unit Linked Investments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Investments, Fair Value Disclosure | 0 | [1] | 0 | [2]
Corporate Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 33,969 | [1] | 38,103 | [2]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 29,670 | [1] | 34,215 | [2]
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 4,299 | [1] | 3,888 | [2]
Canadian Provincial Governments [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 3,626 | [1] | 4,944 | [2]
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 3,626 | [1] | 4,944 | [2]
Canadian Provincial Governments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Residential Mortgage Backed Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 941 | [1] | 1,050 | [2]
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 931 | [1] | 1,049 | [2]
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 10 | [1] | 1 | [2]
Asset-backed Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 3,878 | [1] | 4,005 | [2]
Assets, Fair Value Disclosure | 274 |  | 205 |
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 2,603 | [1] | 2,908 | [2]
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,275 | [1] | 1,097 | [2]
Commercial Mortgage Backed Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,623 | [1] | 1,849 | [2]
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,555 | [1] | 1,768 | [2]
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 68 | [1] | 81 | [2]
US Treasury and Government [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,482 | [1] | 2,105 | [2]
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,388 | [1] | 1,993 | [2]
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 85 | [1] | 100 | [2]
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 9 | [1] | 12 | [2]
US States and Political Subdivisions Debt Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,119 | [1] | 1,323 | [2]
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 1,093 | [1] | 1,290 | [2]
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 26 | [1] | 33 | [2]
Debt Security, Government, Non-US [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 6,263 | [1] | 7,370 | [2]
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 0 | [1] | 0 | [2]
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | 6,228 | [1] | 7,337 | [2]
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Fixed maturity securities available-for-sale | $ 35 | [1] | $ 33 | [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 December 31, 2022, the fair value of such investments was $683 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, 2021, the fair value of such investments was $581 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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + 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 No definition available. + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126960272&loc=d3e32014-111567 + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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