Statutory Accounting Information (Schedule Of Statutory Net Income And Statutory Surplus (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
The Cincinnati Insurance Company
Statutory Accounting Practices
Statutory net income	$ 607	$ 520	$ 929
Capital and surplus	7,294	6,512
The Cincinnati Casualty Company
Statutory Accounting Practices
Statutory net income	13	14	15
Capital and surplus	517	495
The Cincinnati Indemnity Company
Statutory Accounting Practices
Statutory net income	3	4	5
Capital and surplus	130	126
The Cincinnati Specialty Underwriters Insurance Company
Statutory Accounting Practices
Statutory net income	76	61	47
Capital and surplus	611	542
The Cincinnati Life Insurance Company
Statutory Accounting Practices
Statutory net income	90	64	$ 41
Capital and surplus	$ 414	$ 326