Debt	9 Months Ended
Sep. 30, 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, $600 million of 5.75 percent senior notes due May 2018 and $100 million of 6.6 percent senior notes due August 2018 were paid upon maturity. During April 2018, we redeemed $1.0 billion of 6.375 percent unsecured junior subordinated capital securities due to mature in April 2037 and recorded a loss of $36 million from the extinguishment of debt, which is included in Net realized gains (losses) in the Consolidated statement of operations. In June 2018, we reclassified $499 million of the 5.9 percent senior notes ($500 million par value due to mature in June 2019) from long-term to short-term debt in the Consolidated balance sheets.

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, $600 million of 5.75 percent senior notes due May 2018 and $100 million of 6.6 percent senior notes due August 2018 were paid upon maturity. During April 2018, we redeemed $1.0 billion of 6.375 percent unsecured junior subordinated capital securities due to mature in April 2037 and recorded a loss of $36 million from the extinguishment of debt, which is included in Net realized gains (losses) in the Consolidated statement of operations.

In June 2018, we reclassified $499 million of the 5.9 percent senior notes ($500 million par value due to mature in June 2019) from long-term to short-term debt in the Consolidated balance sheets.