Accounting Policies	9 Months Ended
Accounting Policies	Sep. 30, 2022
Accounting Policies [Abstract]
Accounting Policies	Accounting Policies The condensed consolidated financial statements include the accounts of Cincinnati Financial Corporation and its consolidated subsidiaries, each of which is wholly owned. These statements are presented in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Our actual results could differ from those estimates. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been condensed or omitted. Our September 30, 2022, condensed consolidated financial statements are unaudited. We believe that we have made all adjustments, consisting only of normal recurring accruals, that are necessary for fair presentation. These condensed consolidated financial statements should be read in conjunction with our consolidated financial statements included in our 2021 Annual Report on Form 10-K. The results of operations for interim periods do not necessarily indicate results to be expected for the full year. The company continues to monitor the impact of the coronavirus (SARS-CoV-2 or COVID-19) pandemic outbreak. The company cannot predict the impact the pandemic will have on its future consolidated financial position, results of operations and cash flows, however the impact could be material. Pending Accounting Updates ASU 2018-12, Financial Services - Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts In August 2018, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2018-12, Financial Services - Insurance (Topic 944): Targeted Improvements to the Accounting for Long-Duration Contracts. ASU 2018-12 requires changes to the measurement and disclosure of long-duration insurance contracts. In November 2020, the FASB issued an ASU that delayed the effective date of ASU 2018-12 to interim and annual reporting periods beginning after December 15, 2022. We plan to adopt these ASUs on a modified retrospective basis on January 1, 2023. Related to the company's term and whole life products included in life policy and investment contract reserves, the new guidance requires that cash flow assumptions be reviewed at least annually to determine any necessary updates. Additionally, the discount rate assumption is required to be updated quarterly based on upper-medium grade fixed-income instrument yields (market value discount rates). The life policy and investment contract reserves balance is adjusted through insurance losses and contract holders' benefits for cash flow assumption updates and through accumulated other comprehensive income (AOCI) for discount rate updates. These ASUs also amend the previous guidance related to life deferred policy acquisition costs by requiring amortization of those costs on a constant level basis for a group of contracts that approximates straight-line and the removal of shadow deferred policy acquisition costs for universal life and deferred annuity products. These ASUs also require entities to provide additional disclosures including disaggregated rollforwards of the life policy and investment contract reserves, separate account liabilities and life deferred policy acquisition costs. Based on current conditions, management estimates at September 30, 2022, that adoption would not have a material impact and would have resulted in an after-tax increase to shareholders' equity of approximately $50 million. The ultimate impact of adoption of these ASUs will be affected by the market value discount rates and other assumptions determined at the January 1, 2023, adoption date and could be material. The process of addressing necessary remaining implementation-related items, including modifications to reporting and analysis capabilities as well as actuarial systems and associated data processes is substantially complete.