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Investments (Schedule Of Investments In Partially-Owned Insurance Companies) (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | $ 2,877 | $ 3,130 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | 1,315 | 1,429 |
Goodwill |  |  | $ 16,287 | $ 15,213 | $ 15,400
Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Equity method investment, additional 22.0 percent agreed on | 22.00% |  |  |  |
CHINA | Huatai Group [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 47.00% | 47.00% |
CHINA | Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
equity method investment, additional 16.9 percentage obtained |  | 16.90% |  |  |
CHINA | Huatai Life Insurance Co. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 20.00% | 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% | 17.00% |
Saudi Arabia | Chubb Arabia Cooperative Insurance Company [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 30.00% | 30.00% |
Russia | Russian Reinsurance Company |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 23.00% | 23.00% |
Huatai Group [Member] | CHINA |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | $ 2,490 | $ 2,698 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | 1,247 | 1,355 |
Huatai Life Insurance Co. [Member] | CHINA |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | 215 | 253 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | 65 | 71 |
Freisenbruch-Meyer | Bermuda |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | 11 | 10 |
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 |  |  | 24 | 23 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | 0 | 0 |
Russian Reinsurance Company | Russia |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | 0 | 4 |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity |  |  | 0 | 0 |
ABR Reinsurance Capital Holdings Ltd. [Member] | Bermuda |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Carrying Value |  |  | 137 | 142 |
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 |  |  | 18.80% |  |
Total Direct and Indirect [Member] | CHINA | Huatai Life Insurance Co. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 57.70% |  |
Direct Ownership [Member] | Huatai Group [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 47.30% |  |
Direct Ownership [Member] | Huatai Group [Member] | Subsequent Event [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage | 64.20% |  |  |  |
Direct Ownership [Member] | CHINA | Huatai Life Insurance Co. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 20.00% |  |
Indirect Ownership [Member] | CHINA | Huatai Life Insurance Co. [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Ownership Percentage |  |  | 37.70% |  |

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