Note Payable	12 Months Ended
	Dec. 31, 2020
Notes Payable, Current [Abstract]
Note Payable	Note PayableWe have one unsecured revolving credit facility through multiple commercial banks which was due to expire on February 4, 2025, with the option of a one-year extension remaining from the 2019 amendment. The borrowing capacity is $300 million with an additional $300 million accordion feature. Terms and conditions of the agreement include a debt-to-total capital maximum of 35%. On December 11, 2020, we exercised our option to extend the term of the line of credit one year to February 4, 2026. We had no compensating balance requirements on short-term debt for either 2020 or 2019. At December 31, 2020 and 2019, $54 million and $39 million was drawn on the line of credit, respectively. The interest rate charged on our borrowings on this credit agreement ranged from 1.03% to 4.25% during 2020 and ranged from 2.59% to 3.41% during 2019. In addition, we have letters of credit related to our Cincinnati Re and Cincinnati Global operations with no amounts drawn at December 31, 2020 and 2019.