Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investments
Fixed maturities, at fair value	$ 9,650	$ 9,460
Equity securities, at fair value	4,706	4,858
Other invested assets	67	68
Total investments	14,423	14,386
Cash and cash equivalents	544	591	$ 433	$ 487
Investment income receivable	129	123
Land, building and equipment, net, for company use (accumulated depreciation: 2015—$118; 2014—$112)	185	194
Other assets	154	70
Total assets	18,888	18,748
Liabilities
Deferred federal income tax	1,047	1,239
Long-term debt	786	786
Other liabilities	717	648
Total liabilities	12,461	12,175
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,232	1,214
Retained earnings	4,762	4,505
Accumulated other comprehensive income	1,344	1,744
Treasury stock at cost	(1,308)	(1,287)
Total shareholders' equity	6,427	6,573	6,070
Total liabilities and shareholders' equity	18,888	18,748
Cincinnati Financial Corporation
Investments
Fixed maturities, at fair value	58	69
Equity securities, at fair value	1,583	1,643
Other invested assets	36	37
Total investments	1,677	1,749
Cash and cash equivalents	106	72	$ 91	$ 90
Equity in net assets of subsidiaries	5,482	5,627
Investment income receivable	6	6
Land, building and equipment, net, for company use (accumulated depreciation: 2015—$118; 2014—$112)	139	144
Income tax receivable	6	0
Other assets	21	18
Due from subsidiaries	107	107
Total assets	7,544	7,723
Liabilities
Dividends declared but unpaid	75	72
Deferred federal income tax	173	216
Long-term debt	786	786
Other liabilities	83	76
Total liabilities	1,117	1,150
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,232	1,214
Retained earnings	4,762	4,505
Accumulated other comprehensive income	1,344	1,744
Treasury stock at cost	(1,308)	(1,287)
Total shareholders' equity	6,427	6,573
Total liabilities and shareholders' equity	$ 7,544	$ 7,723