Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments
Fixed maturities, at fair value (amortized cost: 2019—$49; 2018—$35)	$ 11,698	$ 10,689
Equity securities, at fair value (cost: 2019—$1,427; 2018—$1,282)	7,752	5,920
Other invested assets	296	123
Total investments	19,746	16,732
Cash and cash equivalents	767	784	$ 657	$ 777
Investment income receivable	133	132
Land, building and equipment, net, for company use (accumulated depreciation: 2019—$129; 2018—$121)	207	195
Other assets	381	308
Total assets	25,408	21,935
Liabilities
Deferred federal income tax	1,307	825
Long-term debt	788	788
Other liabilities	928	804
Total liabilities	15,544	14,102
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,306	1,281
Retained earnings	9,257	7,625
Accumulated other comprehensive income	448	22
Treasury stock at cost	(1,544)	(1,492)
Total shareholders' equity	9,864	7,833	8,243
Total liabilities and shareholders' equity	25,408	21,935
Cincinnati Financial Corporation
Investments
Fixed maturities, at fair value (amortized cost: 2019—$49; 2018—$35)	49	35
Equity securities, at fair value (cost: 2019—$1,427; 2018—$1,282)	3,069	2,234
Other invested assets	103	36
Total investments	3,221	2,305
Cash and cash equivalents	197	209	$ 199	$ 248
Equity in net assets of subsidiaries	7,424	6,152
Investment income receivable	7	6
Land, building and equipment, net, for company use (accumulated depreciation: 2019—$129; 2018—$121)	141	137
Income tax receivable	2	1
Other assets	61	48
Due from subsidiaries	107	106
Total assets	11,160	8,964
Liabilities
Dividends declared but unpaid	91	86
Deferred federal income tax	345	198
Long-term debt	788	788
Other liabilities	72	59
Total liabilities	1,296	1,131
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,306	1,281
Retained earnings	9,257	7,625
Accumulated other comprehensive income	448	22
Treasury stock at cost	(1,544)	(1,492)
Total shareholders' equity	9,864	7,833
Total liabilities and shareholders' equity	$ 11,160	$ 8,964