Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUES
Investment income, net of expenses									$ 529	$ 531	$ 525
Realized gains on investments									83	42	70
Other revenue									9	10	10
Total revenues	1,172	1,152	1,104	1,103	1,070	1,035	1,020	986	4,531	4,111	3,803
EXPENSES
Interest expense									54	54	54
Other expenses									15	14	13
Total benefits and expenses									3,817	3,545	3,630
Income (loss) before income taxes	167	182	148	217	273	152	29	112	714	566	173
BENEFIT FOR INCOME TAXES									197	145	9
NET INCOME	122	131	110	154	192	111	32	86	517	421	164
Cincinnati Financial Corporation [Member]
REVENUES
Investment income, net of expenses									41	42	41
Realized gains on investments									21	34	15
Other revenue									15	15	14
Total revenues									77	91	70
EXPENSES
Interest expense									53	53	53
Other expenses									29	27	25
Total benefits and expenses									82	80	78
Income (loss) before income taxes									(5)	11	(8)
BENEFIT FOR INCOME TAXES									(11)	(4)	(9)
NET INCOME BEFORE EARNINGS OF SUBSIDIARIES									6	15	1
Increase in equity of subsidiaries									511	406	163
NET INCOME									$ 517	$ 421	$ 164