Debt	3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt In March 2018, Chubb INA Holdings Inc. (Chubb INA) issued €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 1.55 percent Euro denominated senior notes due March 2028 and €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 2.5 percent Euro denominated senior notes due March 2038. These senior notes are redeemable at any time at Chubb INA's option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable comparable government bond rate plus 0.15 percent for the senior notes due 2028 and 0.25 percent for the senior notes due 2038). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund. These senior unsecured notes are guaranteed on a senior basis by Chubb and they rank equally with all of Chubb's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt. Chubb INA's $300 million of 5.8 percent senior notes due March 2018 were paid upon maturity. In March 2018, we reclassified $964 million of the 6.375 percent unsecured junior subordinated capital securities ($1.0 billion par value with the final maturity date of March 2067) from long-term to short-term debt in the Consolidated balance sheets given our intention to redeem these securities on April 6, 2018, prior to the maturity date. Subsequently, the $1.0 billion capital securities were redeemed on April 6, 2018.

Debt

In March 2018, Chubb INA Holdings Inc. (Chubb INA) issued €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 1.55 percent Euro denominated senior notes due March 2028 and €900 million ($1.1 billion based on the foreign exchange rate at the date of issuance) of 2.5 percent Euro denominated senior notes due March 2038. These senior notes are redeemable at any time at Chubb INA's option subject to a “make-whole” premium (the present value of the remaining principal and interest discounted at the applicable comparable government bond rate plus 0.15 percent for the senior notes due 2028 and 0.25 percent for the senior notes due 2038). The notes are also redeemable at par plus accrued and unpaid interest in the event of certain changes in tax law. These notes do not have the benefit of any sinking fund. These senior unsecured notes are guaranteed on a senior basis by Chubb and they rank equally with all of Chubb's other senior obligations. They also contain customary limitations on lien provisions as well as customary events of default provisions which, if breached, could result in the accelerated maturity of such senior debt.

Chubb INA's $300 million of 5.8 percent senior notes due March 2018 were paid upon maturity.

In March 2018, we reclassified $964 million of the 6.375 percent unsecured junior subordinated capital securities ($1.0 billion par value with the final maturity date of March 2067) from long-term to short-term debt in the Consolidated balance sheets given our intention to redeem these securities on April 6, 2018, prior to the maturity date. Subsequently, the $1.0 billion capital securities were redeemed on April 6, 2018.