Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) reporting_locations independent_insurance_agency state subsidiary	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2008
Significant Accounting Policies
Income Tax Examination, Penalties Expense	$ 0
Number of operating subsidaries | subsidiary	2
Number of independent insurance agencies | independent_insurance_agency	1,984
Number of reporting locations | reporting_locations	2,861
Number of states in which entity operates | state	46
Excess (deficit) of Separate Account Fair Value over (under) Contract Holder Account Value	$ (64,000,000)	$ 79,000,000
Other invested assets	452,000,000	329,000,000
Depreciation expense	33,000,000	33,000,000	$ 33,000,000
Land, building and equipment impairments	0	0	0
Premium Receivable, Allowance for Credit Loss	13,000,000	14,000,000	19,000,000
Premium Receivable, Allowance for Credit Loss, Property Casualty Premiums Receivable			9,000,000
Covid-19 pandemic-related incurred loss and expenses			$ 85,000,000
Minimum participant age to elect				40 years
Accounting Standards Update 2018-12
Significant Accounting Policies
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 30,000,000
Minimum [Member]
Significant Accounting Policies
Estimated useful lives	3 years
Maximum
Significant Accounting Policies
Estimated useful lives	39 years 6 months
Life Policy Loans
Significant Accounting Policies
Other invested assets	$ 31,000,000	31,000,000
Venture Capital Funds
Significant Accounting Policies
Other invested assets	337,000,000	227,000,000
Real Estate Investment
Significant Accounting Policies
Other invested assets	47,000,000	36,000,000
Other than Securities Investment
Significant Accounting Policies
Other invested assets	$ 37,000,000	$ 35,000,000
10 Largest States
Significant Accounting Policies
Percentage Of Premiums	50.10%	52.10%
Ohio, Largest State
Significant Accounting Policies
Percentage Of Premiums	13.40%	14.40%
Illinois, New York, North Carolina, Pennsylvania, Georgia and Indiana | Minimum [Member]
Significant Accounting Policies
Percentage Of Premiums	4.00%
Illinois, New York, North Carolina, Pennsylvania, Georgia and Indiana | Maximum
Significant Accounting Policies
Percentage Of Premiums	6.00%
Largest Single Agency Relationship
Significant Accounting Policies
Percentage Of Premiums	0.60%
All Other | Maximum
Significant Accounting Policies
Percentage Of Premiums	5.00%
Stock Options
Significant Accounting Policies
Weighted-average remaining contractual life for options expected to vest	10 years
Property Casualty Insurance Segment
Significant Accounting Policies
Number of operating subsidaries | subsidiary	2
Stock Options
Significant Accounting Policies
Awards vesting period	3 years
Restricted Stock Units (RSUs)
Significant Accounting Policies
Awards vesting period	3 years
Cincinnati Global
Significant Accounting Policies
Goodwill	$ 30,000,000	$ 30,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets	$ 31,000,000	$ 31,000,000
Broker Relationships and Internally developed technology | Cincinnati Global | Minimum [Member]
Significant Accounting Policies
Useful life	5 years
Broker Relationships and Internally developed technology | Cincinnati Global | Maximum
Significant Accounting Policies
Useful life	15 years