| **Cover Page - USD ($)**                    | 12 Months Ended                                                                                                                                                                                                       |             |                  |
|---------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------|------------------|
||
| **Cover [Abstract]**                        |                                                                                                                                                                                                                  |        |             |
| Document Type                               | 10-K                                                                                                                                                                                                                  |        |             |
| Document Annual Report                      | true                                                                                                                                                                                                                  |        |             |
| Document Period End Date                    | Dec. 31,  2021                                                                                                                                                                                                        |        |             |
| Document Transition Report                  | false                                                                                                                                                                                                                 |        |             |
| Entity File Number                          | 000-04604                                                                                                                                                                                                             |        |             |
| Entity Registrant Name                      | Cincinnati Financial Corporation                                                                                                                                                                                      |        |             |
| Entity Incorporation, State or Country Code | OH                                                                                                                                                                                                                    |        |             |
| Entity Tax Identification Number            | 31-0746871                                                                                                                                                                                                            |        |             |
| Entity Address, Address Line One            | 6200 S. Gilmore Road                                                                                                                                                                                                  |        |             |
| Entity Address, City or Town                | Fairfield                                                                                                                                                                                                             |        |             |
| Entity Address, State or Province           | OH                                                                                                                                                                                                                    |        |             |
| Entity Address, Postal Zip Code             | 45014-5141                                                                                                                                                                                                            |        |             |
| City Area Code                              | 513                                                                                                                                                                                                                   |        |             |
| Local Phone Number                          | 870-2000                                                                                                                                                                                                              |        |             |
| Title of 12(b) Security                     | Common stock, $2.00 par                                                                                                                                                                                               |        |             |
| Trading Symbol                              | CINF                                                                                                                                                                                                                  |        |             |
| Security Exchange Name                      | NASDAQ                                                                                                                                                                                                                |        |             |
| Entity Well-known Seasoned Issuer           | Yes                                                                                                                                                                                                                   |        |             |
| Entity Voluntary Filers                     | No                                                                                                                                                                                                                    |        |             |
| Entity Current Reporting Status             | Yes                                                                                                                                                                                                                   |        |             |
| Entity Interactive Data Current             | Yes                                                                                                                                                                                                                   |        |             |
| Entity Filer Category                       | Large Accelerated Filer                                                                                                                                                                                               |        |             |
| Entity Small Business                       | false                                                                                                                                                                                                                 |        |             |
| Entity Emerging Growth Company              | false                                                                                                                                                                                                                 |        |             |
| ICFR Auditor Attestation Flag               | true                                                                                                                                                                                                                  |        |             |
| Entity Shell Company                        | false                                                                                                                                                                                                                 |        |             |
| Entity Public Float                         |                                                                                                                                                                                                                  |        | $ 18,398,492,958 |
| Entity Common Stock, Shares Outstanding     |                                                                                                                                                                                                                  | 160,433,769 |             |
| Entity Central Index Key                    | 0000020286                                                                                                                                                                                                            |        |             |
| Current Fiscal Year End Date                | --12-31                                                                                                                                                                                                               |        |             |
| Document Fiscal Year Focus                  | 2021                                                                                                                                                                                                                  |        |             |
| Document Fiscal Period Focus                | FY                                                                                                                                                                                                                    |        |             |
| Amendment Flag                              | false                                                                                                                                                                                                                 |        |             |
| Documents Incorporated by Reference         | Portions of the definitive Proxy Statement for Cincinnati Financial Corporation’s Annual Meeting of Shareholders to be held on May 7, 2022, are incorporated by reference into Part III of this Form 10-K. |        |             |

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.
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Address Line 1 such as Attn, Building Name, Street Name
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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
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Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.
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Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days. This information should be based on the registrant's current or most recent filing containing the related disclosure.
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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
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Indicate whether the registrant is one of the following: Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.
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The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.
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The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
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