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Investments (Schedule Of Sources Of Net Investment Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 3,473 | $ 3,289 | $ 3,006
Investment expenses |  |  |  |  |  |  |  |  | (168) | (164) | (141)
Net investment income | $ 848 | $ 823 | $ 828 | $ 806 | $ 797 | $ 813 | $ 770 | $ 745 | 3,305 | 3,125 | 2,865
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  |  | (592) | (694) | (737)
The Chubb Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of Debt Issuance Costs and Discounts |  |  |  |  |  |  |  |  | (248) | (332) | (393)
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 3,128 | 2,987 | 2,779
Short-term investments |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 90 | 56 | 58
Other interest income [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 118 | 75 | 35
Equity securities |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | 33 | 38 | 36
Other Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  | $ 104 | $ 133 | $ 98

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