Condensed Financial Statements Of Parent Company Condensed Statements Of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net Income (Loss)	$ 1,843	$ (487)	$ 2,968
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	112	127	118
Investment gains and losses, net	(1,108)	1,493	(2,353)
Changes in:
Current income tax receivable/payable	42	(40)	(25)
Other assets	(30)	28	(11)
Net cash provided by operating activities	2,052	2,052	1,981
Cash Flows From Investing Activities
Sale, call or maturity of fixed maturities	1,136	1,113	1,461
Sale of equity securities	206	430	136
Purchase of fixed maturities	(2,554)	(1,901)	(2,388)
Purchase of equity securities	(220)	(466)	(313)
Investment in buildings and equipment	(18)	(15)	(15)
Change in other invested assets, net	(143)	(101)	64
Net cash (used in) received from investing activities	(1,608)	(933)	(1,057)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(454)	(423)	(395)
Shares acquired - share repurchase authorization	(67)	(410)	(144)
Proceeds from stock options exercised	9	10	13
Other	(129)	(93)	(98)
Net cash used in financing activities	(801)	(994)	(685)
Net change in cash and cash equivalents	(357)	125	239
Cincinnati Financial Corporation
Cash Flows From Operating Activities
Net Income (Loss)	1,843	(487)	2,968
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and other	10	9	10
Investment gains and losses, net	(644)	792	(1,034)
Dividends from subsidiaries	426	729	598
Changes in:
Increase in equity of subsidiaries	(1,299)	(112)	(2,106)
Current federal income taxes	1	(6)	6
Current income tax receivable/payable	144	(183)	220
Other assets	(12)	(7)	5
Other liabilities	3	1	0
Intercompany receivable for operations	95	28	5
Net cash provided by operating activities	567	764	672
Cash Flows From Investing Activities
Sale, call or maturity of fixed maturities	17	1	22
Sale of equity securities	138	192	25
Purchase of fixed maturities	(119)	(30)	(19)
Purchase of equity securities	(65)	(187)	(82)
Investment in buildings and equipment	(10)	(4)	(6)
Change in other invested assets, net	0	(4)	108
Net cash (used in) received from investing activities	(39)	(32)	48
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(454)	(423)	(395)
Shares acquired - share repurchase authorization	(67)	(410)	(144)
Proceeds from stock options exercised	9	10	13
Other	1	1	1
Net cash used in financing activities	(511)	(822)	(525)
Net change in cash and cash equivalents	17	(90)	195
Cash and cash equivalents at beginning of year	121	211	16
Cash and cash equivalents at end of year	$ 138	$ 121	$ 211