| **Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenues**                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| Investment income, net of expenses                                                                                    |           |            |   |   |   |   |   |   | $ 646 | $ 619 | $ 609 |
| Investment gains and losses, net                                                                                      |           |            |   |   |   |   |   |   | 1,650 | (402) | 148 |
| Other revenues                                                                                                        |           |            |   |   |   |   |   |   | 9 | 5 | 5 |
| Total revenues                                                                                                        | $ 2,152        | $ 1,700         | $ 1,913 | $ 2,159 | $ 710 | $ 1,915 | $ 1,558 | $ 1,224 | 7,924 | 5,407 | 5,732 |
| **Expenses**                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                      |           |            |   |   |   |   |   |   | 53 | 53 | 53 |
| Other expenses                                                                                                        |           |            |   |   |   |   |   |   | 23 | 16 | 13 |
| Total expenses                                                                                                        |           |            |   |   |   |   |   |   | 5,452 | 5,156 | 5,002 |
| Income (Loss) Before Income Taxes and Earnings of Subsidiaries                                                        | 781            | 294             | 530 | 867 | (581) | 618 | 264 | (50) | 2,472 | 251 | 730 |
| Provision (Benefit) for Income Taxes                                                                                  |           |            |   |   |   |   |   |   | 475 | (36) | (315) |
| Net Income                                                                                                            | $ 626          | $ 248           | $ 428 | $ 695 | $ (452) | $ 553 | $ 217 | $ (31) | 1,997 | 287 | 1,045 |
| Change in unrealized gain (loss) on securities                                                                        |           |            |   |   |   |   |   |   | 0 | (2) | 235 |
| Amortization of pension actuarial gains and losses and prior service costs                                            |           |            |   |   |   |   |   |   | 5 | (3) | 7 |
| Other Comprehensive Income (Loss) Before Other Comprehensive Income (Loss) from Subsidiaries                          |           |            |   |   |   |   |   |   | 5 | (5) | 242 |
| Other Comprehensive Income (Loss) of subsidiaries                                                                     |           |            |   |   |   |   |   |   | 421 | (258) | 361 |
| Other comprehensive income (loss)                                                                                     |           |            |   |   |   |   |   |   | 426 | (263) | 603 |
| Comprehensive Income                                                                                                  |           |            |   |   |   |   |   |   | 2,423 | 24 | 1,648 |
| Cincinnati Financial Corporation                                                                                      |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues**                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| Investment income, net of expenses                                                                                    |           |            |   |   |   |   |   |   | 75 | 65 | 62 |
| Investment gains and losses, net                                                                                      |           |            |   |   |   |   |   |   | 728 | (108) | 28 |
| Other revenues                                                                                                        |           |            |   |   |   |   |   |   | 15 | 15 | 15 |
| Total revenues                                                                                                        |           |            |   |   |   |   |   |   | 818 | (28) | 105 |
| **Expenses**                                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| Interest expense                                                                                                      |           |            |   |   |   |   |   |   | 52 | 52 | 52 |
| Other expenses                                                                                                        |           |            |   |   |   |   |   |   | 37 | 31 | 28 |
| Total expenses                                                                                                        |           |            |   |   |   |   |   |   | 89 | 83 | 80 |
| Income (Loss) Before Income Taxes and Earnings of Subsidiaries                                                        |           |            |   |   |   |   |   |   | 729 | (111) | 25 |
| Provision (Benefit) for Income Taxes                                                                                  |           |            |   |   |   |   |   |   | 146 | (31) | (161) |
| Net Income (Loss) Before Earnings of Subsidiaries                                                                     |           |            |   |   |   |   |   |   | 583 | (80) | 186 |
| Increase in equity of subsidiaries                                                                                    |           |            |   |   |   |   |   |   | 1,414 | 367 | 859 |
| Net Income                                                                                                            |           |            |   |   |   |   |   |   | $ 1,997 | $ 287 | $ 1,045 |

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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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| - Definition
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 of the cost of borrowed funds accounted for as interest expense.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.
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| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax of other comprehensive income (loss) attributable to noncontrolling interests.
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| - Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
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| - Definition
The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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| - Definition
Amount of revenue and income classified as other.
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| - Definition
The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.
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| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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