Statutory Accounting Information (Schedule Of Statutory Net Income And Statutory Surplus (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
The Cincinnati Insurance Company
Statutory Accounting Practices
Statutory net income	$ 929	$ 466	$ 558
Capital and surplus	7,247	5,838
The Cincinnati Casualty Company
Statutory Accounting Practices
Statutory net income	15	14	13
Capital and surplus	500	456
The Cincinnati Indemnity Company
Statutory Accounting Practices
Statutory net income	5	3	3
Capital and surplus	126	115
The Cincinnati Specialty Underwriters Insurance Company
Statutory Accounting Practices
Statutory net income	47	42	62
Capital and surplus	571	528
The Cincinnati Life Insurance Company
Statutory Accounting Practices
Statutory net income	41	27	$ 19
Capital and surplus	$ 270	$ 241