Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues
Investment income, net of expenses	$ 714	$ 670	$ 646
Investment gains and losses, net	2,409	865	1,650
Other revenues	10	10	9
Total revenues	9,630	7,536	7,924
Expenses
Interest expense	53	54	53
Other expenses	20	20	23
Total expenses	5,960	6,037	5,452
Provision for Income Taxes	724	283	475
Net Income	2,946	1,216	1,997
Amortization of pension actuarial gains and losses and prior service costs	54	(25)	5
Other comprehensive income (loss)	(121)	321	426
Comprehensive Income	2,825	1,537	2,423
Cincinnati Financial Corporation
Revenues
Investment income, net of expenses	91	81	75
Investment gains and losses, net	1,058	556	728
Other revenues	15	15	15
Total revenues	1,164	652	818
Expenses
Interest expense	53	54	52
Other expenses	32	34	37
Total expenses	85	88	89
Income Before Income Taxes and Earnings of Subsidiaries	1,079	564	729
Provision for Income Taxes	217	111	146
Net Income Before Earnings of Subsidiaries	862	453	583
Increase in equity of subsidiaries	2,084	763	1,414
Net Income	2,946	1,216	1,997
Change in unrealized gain (loss) on securities	1	0	0
Amortization of pension actuarial gains and losses and prior service costs	54	(25)	5
Other Comprehensive Income (Loss) Before Other Comprehensive Income (Loss) from Subsidiaries	55	(25)	5
Other Comprehensive Income (Loss) of subsidiaries	(176)	346	421
Other comprehensive income (loss)	(121)	321	426
Comprehensive Income	$ 2,825	$ 1,537	$ 2,423