| **Condensed Financial Statements Of Parent Company Condensed Statements Of Cash Flows (Details) - USD ($) $ in Millions** | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Cash Flows From Operating Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Net Income                                                                                                                | $ (452)        | $ 553           | $ 217 | $ (31) | $ 642 | $ 102 | $ 100 | $ 201 | $ 287 | $ 1,045 | $ 591 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**                                     |           |            |   |   |   |   |   |   |   |   |   |
| Depreciation and amortization                                                                                             |           |            |   |   |   |   |   |   | 63 | 55 | 48 |
| Gain (Loss) on Sale of Investments                                                                                        |           |            |   |   |   |   |   |   | 408 | (148) | (124) |
| **Changes in:**                                                                                                           |           |            |   |   |   |   |   |   |   |   |   |
| Investment income receivable                                                                                              |           |            |   |   |   |   |   |   | 2 | 0 | (5) |
| Current income tax receivable/payable                                                                                     |           |            |   |   |   |   |   |   | (91) | 67 | (35) |
| Other assets                                                                                                              |           |            |   |   |   |   |   |   | (1) | (43) | 34 |
| Other liabilities                                                                                                         |           |            |   |   |   |   |   |   | 0 | 24 | 61 |
| Net cash provided by operating activities                                                                                 |           |            |   |   |   |   |   |   | 1,181 | 1,052 | 1,115 |
| **Cash Flows From Investing Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Sale of fixed maturities                                                                                                  |           |            |   |   |   |   |   |   | 36 | 23 | 15 |
| Call or maturity of fixed maturities                                                                                      |           |            |   |   |   |   |   |   | 1,127 | 1,172 | 1,511 |
| Sale of equity securities                                                                                                 |           |            |   |   |   |   |   |   | 403 | 523 | 465 |
| Purchase of fixed maturities                                                                                              |           |            |   |   |   |   |   |   | (1,510) | (1,723) | (1,994) |
| Purchase of equity securities                                                                                             |           |            |   |   |   |   |   |   | (441) | (513) | (439) |
| Investment in buildings and equipment                                                                                     |           |            |   |   |   |   |   |   | (20) | (16) | (13) |
| Change in other invested assets, net                                                                                      |           |            |   |   |   |   |   |   | (38) | (15) | (14) |
| Net cash used in investing activities                                                                                     |           |            |   |   |   |   |   |   | (451) | (558) | (456) |
| **Cash Flows From Financing Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Changes in note payable                                                                                                   |           |            |   |   |   |   |   |   | 8 | 4 | (15) |
| Payment of cash dividends to shareholders                                                                                 |           |            |   |   |   |   |   |   | (336) | (400) | (306) |
| Shares acquired - share repurchase authorization                                                                          |           |            |   |   |   |   |   |   | (125) | (92) | (39) |
| Proceeds from stock options exercised                                                                                     |           |            |   |   |   |   |   |   | 9 | 13 | 21 |
| Other                                                                                                                     |           |            |   |   |   |   |   |   | (60) | (54) | (32) |
| Net cash used in financing activities                                                                                     |           |            |   |   |   |   |   |   | (603) | (614) | (426) |
| Net change in cash and cash equivalents                                                                                   |           |            |   |   |   |   |   |   | 127 | (120) | 233 |
| Cash and cash equivalents at beginning of year                                                                            |           |            |   | 657 |   |   |   | 777 | 657 | 777 | 544 |
| Cash and cash equivalents at end of year                                                                                  | 784            |            |   |   | 657 |   |   |   | 784 | 657 | 777 |
| Cincinnati Financial Corporation                                                                                          |           |            |   |   |   |   |   |   |   |   |   |
| **Cash Flows From Operating Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Net Income                                                                                                                |           |            |   |   |   |   |   |   | 287 | 1,045 | 591 |
| **Adjustments to reconcile net income to net cash provided by operating activities:**                                     |           |            |   |   |   |   |   |   |   |   |   |
| Depreciation and amortization                                                                                             |           |            |   |   |   |   |   |   | 7 | 7 | 6 |
| Gain (Loss) on Sale of Investments                                                                                        |           |            |   |   |   |   |   |   | 114 | (28) | (27) |
| Dividends from subsidiaries                                                                                               |           |            |   |   |   |   |   |   | 500 | 465 | 475 |
| **Changes in:**                                                                                                           |           |            |   |   |   |   |   |   |   |   |   |
| Increase in equity of subsidiaries                                                                                        |           |            |   |   |   |   |   |   | (367) | (859) | (566) |
| Investment income receivable                                                                                              |           |            |   |   |   |   |   |   | 2 | 0 | (2) |
| Current federal income taxes                                                                                              |           |            |   |   |   |   |   |   | 14 | (5) | (4) |
| Current income tax receivable/payable                                                                                     |           |            |   |   |   |   |   |   | (35) | (150) | 8 |
| Other assets                                                                                                              |           |            |   |   |   |   |   |   | (17) | (20) | (4) |
| Other liabilities                                                                                                         |           |            |   |   |   |   |   |   | 3 | 15 | (1) |
| Intercompany receivable for operations                                                                                    |           |            |   |   |   |   |   |   | 19 | 13 | 20 |
| Net cash provided by operating activities                                                                                 |           |            |   |   |   |   |   |   | 527 | 483 | 496 |
| **Cash Flows From Investing Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Sale of fixed maturities                                                                                                  |           |            |   |   |   |   |   |   | 1 | 0 | 0 |
| Call or maturity of fixed maturities                                                                                      |           |            |   |   |   |   |   |   | 19 | 14 | 5 |
| Sale of equity securities                                                                                                 |           |            |   |   |   |   |   |   | 131 | 230 | 135 |
| Purchase of fixed maturities                                                                                              |           |            |   |   |   |   |   |   | (17) | (2) | 0 |
| Purchase of equity securities                                                                                             |           |            |   |   |   |   |   |   | (177) | (293) | (175) |
| Investment in buildings and equipment                                                                                     |           |            |   |   |   |   |   |   | (12) | (3) | (2) |
| Change in other invested assets, net                                                                                      |           |            |   |   |   |   |   |   | (11) | 0 | 6 |
| Net cash used in investing activities                                                                                     |           |            |   |   |   |   |   |   | (66) | (54) | (31) |
| **Cash Flows From Financing Activities**                                                                                  |           |            |   |   |   |   |   |   |   |   |   |
| Payment of cash dividends to shareholders                                                                                 |           |            |   |   |   |   |   |   | (336) | (400) | (306) |
| Shares acquired - share repurchase authorization                                                                          |           |            |   |   |   |   |   |   | (125) | (92) | (39) |
| Proceeds from stock options exercised                                                                                     |           |            |   |   |   |   |   |   | 9 | 13 | 21 |
| Other                                                                                                                     |           |            |   |   |   |   |   |   | 1 | 1 | 1 |
| Net cash used in financing activities                                                                                     |           |            |   |   |   |   |   |   | (451) | (478) | (323) |
| Net change in cash and cash equivalents                                                                                   |           |            |   |   |   |   |   |   | 10 | (49) | 142 |
| Cash and cash equivalents at beginning of year                                                                            |           |            |   | $ 199 |   |   |   | $ 248 | 199 | 248 | 106 |
| Cash and cash equivalents at end of year                                                                                  | $ 209          |            |   |   | $ 199 |   |   |   | $ 209 | $ 199 | $ 248 |

| X                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase or decrease in equity subsidiaries.
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| - Definition
Intercompany Receivable for Operations
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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| - Definition
This element represents disclosure of the aggregate cash dividends paid to the entity by unconsolidated subsidiaries.
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| - Definition
The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.
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| - Definition
The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.
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| - Definition
The increase (decrease) during the reporting period in investment income that has been earned but not yet received in cash.
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| - Definition
The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.
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| - Definition
The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.
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| - Definition
The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.
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| - Definition
Amount of increase (decrease) in operating assets classified as other.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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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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| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
The cash outflow to reacquire common stock during the period.
+ References
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
+ References
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| - Definition
The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities.
+ References
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| - Definition
The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities.
+ References
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| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash inflow (outflow) from financing activities classified as other.
+ References
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| - Definition
Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.
+ References
No definition available.
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| - Definition
The cash inflow associated with the sale of debt securities classified as available-for-sale securities.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash inflow associated with the sale of equity securities classified as available-for-sale securities.
+ References
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| - Definition
Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.
+ References
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