Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investments
Fixed maturities, at fair value	$ 9,121	$ 9,093
Equity securities, at fair value	4,375	3,373
Other invested assets	68	68
Investments	13,564	12,534
Cash and cash equivalents	433	487	438	385
Investment income receivable	121	115
Land, building and equipment, net, for company use (accumulated depreciation: 2011-$94; 2010-$77)	210	217
Other assets	73	61
Total assets	17,662	16,548
LIABILITIES
Deferred federal income tax	673	453
Long-term debt	790	790
Other liabilities	611	660
Total liabilities	11,592	11,095
SHAREHOLDERS' EQUITY
Common stock	397	394
Paid-in capital	1,191	1,134
Retained earnings	4,268	4,021
Accumulated other comprehensive income	1,504	1,129	901	769
Treasury stock at cost	(1,290)	(1,225)
Total shareholders' equity	6,070	5,453	5,033
Total liabilities and shareholders' equity	17,662	16,548
Cincinnati Financial Corporation [Member]
Investments
Fixed maturities, at fair value	75	103
Equity securities, at fair value	1,366	958
Other invested assets	32	31
Investments	1,473	1,092
Cash and cash equivalents	91	90	20	38
Equity in net assets of subsidiaries	5,351	5,103
Investment income receivable	5	3
Land, building and equipment, net, for company use (accumulated depreciation: 2011-$94; 2010-$77)	148	153
Prepaid income tax	2	14
Other assets	24	35
Due from subsidiaries	114	75
Total assets	7,208	6,565
LIABILITIES
Dividends declared but unpaid	68	66
Deferred federal income tax	185	63
Long-term debt	790	790
Other liabilities	95	193
Total liabilities	1,138	1,112
SHAREHOLDERS' EQUITY
Common stock	397	394
Paid-in capital	1,191	1,134
Retained earnings	4,268	4,021
Accumulated other comprehensive income	1,504	1,129
Treasury stock at cost	1,290	1,225
Total shareholders' equity	6,070	5,453
Total liabilities and shareholders' equity	$ 7,208	$ 6,565