| **Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Revenues**                                                                                                          |            |   |   |
| Investment income, net of expenses                                                                                    | $ 714           | $ 670 | $ 646 |
| Investment gains and losses, net                                                                                      | 2,409           | 865 | 1,650 |
| Other revenues                                                                                                        | 10              | 10 | 9 |
| Total revenues                                                                                                        | 9,630           | 7,536 | 7,924 |
| **Expenses**                                                                                                          |            |   |   |
| Interest expense                                                                                                      | 53              | 54 | 53 |
| Other expenses                                                                                                        | 20              | 20 | 23 |
| Total expenses                                                                                                        | 5,960           | 6,037 | 5,452 |
| Provision for Income Taxes                                                                                            | 724             | 283 | 475 |
| Net Income                                                                                                            | 2,946           | 1,216 | 1,997 |
| Amortization of pension actuarial gains and losses and prior service costs                                            | 54              | (25) | 5 |
| Other comprehensive income (loss)                                                                                     | (121)           | 321 | 426 |
| Comprehensive Income                                                                                                  | 2,825           | 1,537 | 2,423 |
| Cincinnati Financial Corporation                                                                                      |            |   |   |
| **Revenues**                                                                                                          |            |   |   |
| Investment income, net of expenses                                                                                    | 91              | 81 | 75 |
| Investment gains and losses, net                                                                                      | 1,058           | 556 | 728 |
| Other revenues                                                                                                        | 15              | 15 | 15 |
| Total revenues                                                                                                        | 1,164           | 652 | 818 |
| **Expenses**                                                                                                          |            |   |   |
| Interest expense                                                                                                      | 53              | 54 | 52 |
| Other expenses                                                                                                        | 32              | 34 | 37 |
| Total expenses                                                                                                        | 85              | 88 | 89 |
| Income Before Income Taxes and Earnings of Subsidiaries                                                               | 1,079           | 564 | 729 |
| Provision for Income Taxes                                                                                            | 217             | 111 | 146 |
| Net Income Before Earnings of Subsidiaries                                                                            | 862             | 453 | 583 |
| Increase in equity of subsidiaries                                                                                    | 2,084           | 763 | 1,414 |
| Net Income                                                                                                            | 2,946           | 1,216 | 1,997 |
| Change in unrealized gain (loss) on securities                                                                        | 1               | 0 | 0 |
| Amortization of pension actuarial gains and losses and prior service costs                                            | 54              | (25) | 5 |
| Other Comprehensive Income (Loss) Before Other Comprehensive Income (Loss) from Subsidiaries                          | 55              | (25) | 5 |
| Other Comprehensive Income (Loss) of subsidiaries                                                                     | (176)           | 346 | 421 |
| Other comprehensive income (loss)                                                                                     | (121)           | 321 | 426 |
| Comprehensive Income                                                                                                  | $ 2,825         | $ 1,537 | $ 2,423 |

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| - Definition
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| - Definition
The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.
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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.
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