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Investments (Schedule Of Investments In Partially-Owned Insurance Companies) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Investment [Line Items] |  |  |
Carrying Value | $ 191 |  | $ 2,877
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 3 |  | $ 1,315
Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage |  | 64.20% |
CHINA | Huatai Group [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 0.00% |  | 47.00%
CHINA | Huatai Life Insurance Co. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 0.00% |  | 20.00%
Bermuda | Freisenbruch-Meyer |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 40.00% |  | 40.00%
Bermuda | ABR Reinsurance Capital Holdings Ltd. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 19.00% |  | 19.00%
Saudi Arabia | Chubb Arabia Cooperative Insurance Company [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 30.00% |  | 30.00%
Huatai Group [Member] | CHINA |  |  |
Investment [Line Items] |  |  |
Carrying Value | $ 0 |  | $ 2,490
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 0 |  | 1,247
Huatai Life Insurance Co. [Member] | CHINA |  |  |
Investment [Line Items] |  |  |
Carrying Value | 0 |  | 215
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 0 |  | 65
Freisenbruch-Meyer | Bermuda |  |  |
Investment [Line Items] |  |  |
Carrying Value | 12 |  | 11
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 3 |  | 3
Chubb Arabia Cooperative Insurance Company [Member] | Saudi Arabia |  |  |
Investment [Line Items] |  |  |
Carrying Value | 28 |  | 24
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | 0 |  | 0
ABR Reinsurance Capital Holdings Ltd. [Member] | Bermuda |  |  |
Investment [Line Items] |  |  |
Carrying Value | 151 |  | 137
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 0 |  | $ 0
ABR Reinsurance Capital Holdings Ltd. [Member] | Bermuda | ABR Reinsurance Capital Holdings Ltd. [Member] |  |  |
Investment [Line Items] |  |  |
Ownership Percentage | 18.70% |  |

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 + Details
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- Definition Amount of investment in equity method investee and investment in and advance to affiliate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(18)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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