Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Investment income, net of expenses	$ 894	$ 781	$ 714
Investment gains and losses, net	1,127	(1,467)	2,409
Other revenues	13	10	10
Total revenues	10,013	6,563	9,626
Expenses
Interest expense	54	53	53
Other expenses	25	23	20
Total expenses	7,737	7,257	5,928
Provision (Benefit) for Income Taxes	433	(207)	730
Net Income (Loss)	1,843	(487)	2,968
Amortization of pension actuarial gains and losses and prior service costs	(5)	7	54
Other comprehensive income (loss)	179	(911)	(38)
Comprehensive Income (Loss)	2,022	(1,398)	2,930
Cincinnati Financial Corporation
Revenues
Investment income, net of expenses	109	101	91
Investment gains and losses, net	644	(790)	1,058
Other revenues	15	15	15
Total revenues	768	(674)	1,164
Expenses
Interest expense	52	53	53
Other expenses	38	33	32
Total expenses	90	86	85
Income (Loss) Before Income Taxes and Earnings of Subsidiaries	678	(760)	1,079
Provision (Benefit) for Income Taxes	134	(161)	217
Net Income (Loss) Before Earnings of Subsidiaries	544	(599)	862
Increase in equity of subsidiaries	1,299	112	2,106
Net Income (Loss)	1,843	(487)	2,968
Change in unrealized gain (loss) on securities	4	(10)	1
Amortization of pension actuarial gains and losses and prior service costs	(5)	7	54
Other Comprehensive Income (Loss) Before Other Comprehensive Income (Loss) from Subsidiaries	(1)	(3)	55
Other Comprehensive Income (Loss) of subsidiaries	180	(908)	(93)
Other comprehensive income (loss)	179	(911)	(38)
Comprehensive Income (Loss)	$ 2,022	$ (1,398)	$ 2,930