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Investments (Schedule Of Sources Of Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 3,598 | $ 3,473 | $ 3,289
Investment expenses |  |  |  |  |  |  |  |  | (172) | (168) | (164)
Net investment income | $ 858 | $ 873 | $ 859 | $ 836 | $ 848 | $ 823 | $ 828 | $ 806 | 3,426 | 3,305 | 3,125
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  |  | (395) | (592) | (694)
The Chubb Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  |  | (161) | (248) | (332)
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 3,385 | 3,128 | 2,987
Short-term investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 84 | 90 | 56
Other interest income [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 25 | 118 | 75
Equity securities |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 26 | 33 | 38
Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 78 | $ 104 | $ 133

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