Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments
Fixed maturities, at fair value	$ 10,085	$ 9,650
Equity securities, at fair value	5,334	4,706
Other invested assets	81	67
Total investments	15,500	14,423
Cash and cash equivalents	777	544	$ 591	$ 433
Investment income receivable	134	129
Land, building and equipment, net, for company use (accumulated depreciation: 2016—$111; 2015—$118)	183	185
Other assets	198	154
Total assets	20,386	18,888
Liabilities
Deferred federal income tax	1,279	1,047
Long-term debt	787	786
Other liabilities	786	717
Total liabilities	13,326	12,461
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,252	1,232
Retained earnings	5,037	4,762
Accumulated other comprehensive income	1,693	1,344
Treasury stock at cost	(1,319)	(1,308)
Total shareholders' equity	7,060	6,427	6,573
Total liabilities and shareholders' equity	20,386	18,888
Cincinnati Financial Corporation
Investments
Fixed maturities, at fair value	52	58
Equity securities, at fair value	1,833	1,583
Other invested assets	29	36
Total investments	1,914	1,677
Cash and cash equivalents	248	106	$ 72	$ 91
Equity in net assets of subsidiaries	5,790	5,482
Investment income receivable	8	6
Land, building and equipment, net, for company use (accumulated depreciation: 2016—$111; 2015—$118)	132	139
Income tax receivable	10	6
Other assets	35	21
Due from subsidiaries	106	107
Total assets	8,243	7,544
Liabilities
Dividends declared but unpaid	79	75
Deferred federal income tax	252	173
Long-term debt	787	786
Other liabilities	65	83
Total liabilities	1,183	1,117
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,252	1,232
Retained earnings	5,037	4,762
Accumulated other comprehensive income	1,693	1,344
Treasury stock at cost	(1,319)	(1,308)
Total shareholders' equity	7,060	6,427
Total liabilities and shareholders' equity	$ 8,243	$ 7,544