Condensed Financial Statements Of Parent Company Condensed Statements Of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows From Operating Activities
Net Income (Loss)	$ (486)	$ 2,946	$ 1,216
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	127	118	109
Investment gains and losses, net	1,493	(2,353)	(851)
Changes in:
Current income tax receivable/payable	(40)	(25)	44
Other assets	28	(11)	(26)
Net cash provided by operating activities	2,052	1,981	1,491
Cash Flows From Investing Activities
Sale, call or maturity of fixed maturities	1,113	1,461	1,091
Sale of equity securities	430	136	515
Purchase of fixed maturities	(1,901)	(2,388)	(1,382)
Purchase of equity securities	(466)	(313)	(699)
Investment in buildings and equipment	(15)	(15)	(20)
Change in other invested assets, net	(101)	64	(50)
Net cash (used in) received from investing activities	(933)	(1,057)	(560)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(423)	(395)	(375)
Shares acquired - share repurchase authorization	(410)	(144)	(261)
Proceeds from stock options exercised	10	13	7
Other	(93)	(98)	(110)
Net cash used in financing activities	(994)	(685)	(798)
Net change in cash and cash equivalents	125	239	133
Cincinnati Financial Corporation
Cash Flows From Operating Activities
Net Income (Loss)	(486)	2,946	1,216
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	9	10	11
Investment gains and losses, net	792	(1,034)	(552)
Dividends from subsidiaries	729	598	550
Changes in:
Increase in equity of subsidiaries	(113)	(2,084)	(763)
Current federal income taxes	(6)	6	(3)
Current income tax receivable/payable	(183)	220	91
Other assets	(7)	5	0
Other liabilities	1	0	1
Intercompany receivable for operations	28	5	34
Net cash provided by operating activities	764	672	585
Cash Flows From Investing Activities
Sale, call or maturity of fixed maturities	1	22	1
Sale of equity securities	192	25	307
Purchase of fixed maturities	(30)	(19)	(23)
Purchase of equity securities	(187)	(82)	(372)
Investment in buildings and equipment	(4)	(6)	(11)
Change in other invested assets, net	(4)	108	(42)
Net cash (used in) received from investing activities	(32)	48	(140)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(423)	(395)	(375)
Shares acquired - share repurchase authorization	(410)	(144)	(261)
Proceeds from stock options exercised	10	13	7
Other	1	1	3
Net cash used in financing activities	(822)	(525)	(626)
Net change in cash and cash equivalents	(90)	195	(181)
Cash and cash equivalents at beginning of year	211	16	197
Cash and cash equivalents at end of year	$ 121	$ 211	$ 16