| **Accumulated Other Comprehensive Income (Details) (USD $)In Millions, unless otherwise specified**                                     |         |         | 3 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------|---------|---------|----------------|
||
| **Accumulated Other Comprehensive Income Loss Before Tax [Abstract]**                                                                   |    |    |           |   |   |   |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale, before tax, beginning of period                                   |    |    |           |   | $ 1,875 | $ 1,489 |   |   |   |   |
| Other comprehensive income before reclassification, before tax                                                                          |    |    |           |   | 397 | 241 | 0 | 0 |   |   |
| Reclassification adjustment for realized gains, net, included in net income, before tax                                                 |    |    |           |   | (41) | (13) |   |   |   |   |
| Effect on other comprehensive income, before tax                                                                                        |    |    |           |   | 356 | 228 |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale, before tax, end of period                                         |    |    |           |   | 2,231 | 1,717 |   |   |   |   |
| Accumulated unrealized losses, net, for pension obligations, before Tax, beginning of period                                            |    |    |           |   |   |   | (101) | (88) |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost, net, included in net income, before tax          |    |    |           |   |   |   | 2 | 2 |   |   |
| Effect on other comprehensive income, before tax                                                                                        |    |    |           |   |   |   | 2 | 2 |   |   |
| Accumulated unrealized losses, net, for pension obligations, before Tax, end of period                                                  |    |    |           |   |   |   | (99) | (86) |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, before tax, beginning of period |    |    |           |   |   |   |   |   | (50) | (29) |
| Effect on other comprehensive income, before tax                                                                                        |    |    |           |   |   |   |   |   | 0 | (5) |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, before tax, end of period       |    |    |           |   |   |   |   |   | (50) | (34) |
| Accumulated other comprehensive income, before taxes, beginning of period                                                               |    |    | 1,724          | 1,372 |   |   |   |   |   |   |
| Change in unrealized gains, net, on investments available for sale, before Tax                                                          |    |    | 356            | 228 |   |   |   |   |   |   |
| Change in pension obligations, before tax                                                                                               |    |    | 2              | 2 |   |   |   |   |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, before Tax                                                   |    |    | 0              | (5) |   |   |   |   |   |   |
| Effect on other comprehensive income, before Tax                                                                                        |    |    | 358            | 225 |   |   |   |   |   |   |
| Accumulated other comprehensive income, before taxes, end of period                                                                     |    |    | 2,082          | 1,597 |   |   |   |   |   |   |
| **Accumulated Other Comprehensive Income Loss Tax [Abstract]**                                                                          |    |    |           |   |   |   |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, tax, beginning of period                |    |    |           |   | 771 | 592 |   |   |   |   |
| Other comprehensive income before reclassification, tax                                                                                 |    |    |           |   | 139 | 84 | 0 | 0 |   |   |
| Reclassification adjustment for realized gains, net, included in net income, tax                                                        |    |    |           |   | (15) | (4) |   |   |   |   |
| Effect on other comprehensive income, tax                                                                                               |    |    |           |   | 124 | 80 |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, tax, end of period                      |    |    |           |   | 647 | 512 |   |   |   |   |
| Accumulated unrealized losses, net, for pension obligations, tax, beginning of period                                                   |    |    |           |   |   |   | (35) | (31) |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost, net, included in net income, tax                 |    |    |           |   |   |   | 1 | 1 |   |   |
| Effect on other comprehensive income, tax                                                                                               |    |    |           |   |   |   | 1 | 1 |   |   |
| Accumulated unrealized losses, net, for pension obligations, tax, end of period                                                         |    |    |           |   |   |   | (34) | (30) |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, tax, beginning of period        |    |    |           |   |   |   |   |   | (17) | (10) |
| Effect on other comprehensive income, tax                                                                                               |    |    |           |   |   |   |   |   | 0 | (2) |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, tax, end of period              |    |    |           |   |   |   |   |   | (17) | (12) |
| Accumulated other comprehensive income, tax, beginning of period                                                                        |    |    | 595            | 471 |   |   |   |   |   |   |
| Change in unrealized gains, net, on investments available for sale and other invested assets, tax                                       |    |    | 124            | 80 |   |   |   |   |   |   |
| Change in pension obligations, tax                                                                                                      |    |    | 1              | 1 |   |   |   |   |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, tax                                                          |    |    | 0              | (2) |   |   |   |   |   |   |
| Effect on other comprehensive income, tax                                                                                               |    |    | 125            | 79 |   |   |   |   |   |   |
| Accumulated other comprehensive income, tax, end of period                                                                              |    |    | 720            | 550 |   |   |   |   |   |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]**                                                                |    |    |           |   |   |   |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, net of tax, beginning of period         |    |    |           |   | 1,228 | 977 |   |   |   |   |
| Other comprehensive income before reclassification , net of tax                                                                         |    |    |           |   | 258 | 157 | 0 | 0 |   |   |
| Reclassification adjustment for realized gains, net, included in net income, net of tax                                                 |    |    |           |   | (26) | (9) |   |   |   |   |
| Effect on other comprehensive income, net of tax                                                                                        |    |    |           |   | 232 | 148 |   |   |   |   |
| Accumulated unrealized gains, net, on investments available for sale and other invested assets, net of tax, end of period               |    |    |           |   | 1,460 | 1,125 |   |   |   |   |
| Accumulated unrealized losses, net, for pension obligations, net of tax, beginning of period                                            |    |    |           |   |   |   | (66) | (57) |   |   |
| Reclassification adjustment for amortization of actuarial loss and prior service cost,net, included in net income, net of tax           |    |    |           |   |   |   | 1 | 1 |   |   |
| Effect on other comprehensive income, net of tax                                                                                        |    |    |           |   |   |   | 1 | 1 |   |   |
| Accumulated unrealized losses, net, for pension obligations, net of tax, end of period                                                  |    |    |           |   |   |   | (65) | (56) |   |   |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, beginning of period, net of tax |    |    |           |   |   |   |   |   | (33) | (19) |
| Effect on other comprehensive income, net of tax                                                                                        |    |    |           |   |   |   |   |   | 0 | (3) |
| Accumulated unrealized losses, net, on life deferred acquisition costs, life policy reserves and other, end of period, net of tax       |    |    |           |   |   |   |   |   | (33) | (22) |
| Accumulated other comprehensive income, net of tax, beginning of period                                                                 | 1,362   | 1,129   | 1,129          | 901 |   |   |   |   |   |   |
| Change in unrealized gains, net, on investments available for sale, net of tax                                                          |    |    | 232            | 148 |   |   |   |   |   |   |
| Change in pension obligations, net of tax                                                                                               |    |    | 1              | 1 |   |   |   |   |   |   |
| Change in life deferred acquisition costs, life policy reserves and other, net of tax                                                   |    |    | 0              | (3) |   |   |   |   |   |   |
| Effect on other comprehensive income, net of tax                                                                                        |    |    | 233            | 146 |   |   |   |   |   |   |
| Accumulated other comprehensive income, net of tax, end of period                                                                       | $ 1,362 | $ 1,129 | $ 1,362        | $ 1,047 |   |   |   |   |   |   |

| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated Other Comprehensive Income (Loss), Available For Sale Securities,Tax
+ References
No definition available.
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| - Definition
Accumulated Other Comprehensive Income (Loss), Before Taxes
+ References
No definition available.
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| - Definition
The tax effect from the total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
+ References
No definition available.
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| - Definition
Accumulated Other Comprehensive Income (Loss), Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| - Definition
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Net of Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| - Definition
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated Other Comprehensive Income (Loss), Unrealized Gains (Losses) on Available for sale Securities, Before Tax
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated Other Comprehensive Income (Loss), Unrealized Gains (Losses) on Available for sale Securities, Net of Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated Other Comprehensive Income (Loss), Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase (Decrease) in Other Comprehensive Income (Loss), before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Increase (Decrease) in Other Comprehensive Income (Loss), Net of Tax
+ References
No definition available.
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| - Definition
Increase (Decrease) in Other Comprehensive Income (Loss), Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Before Tax, Period Increase (Decrease)
+ References
No definition available.
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| - Definition
Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Net of Tax, Period Increase (Decrease)
+ References
No definition available.
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| - Definition
Other Comprehensive Income (Loss),Amortization of Actuarial Loss and Prior Service Cost Adjustment, Tax, Period Increase (Decrease)
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Before Tax, Period Increase (Decrease)
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTaxPeriodIncreaseDecrease**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
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| - Definition
Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Net of Tax, Period Increase (Decrease)
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Available For Sale Securities Adjustment, Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, Net of Tax
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentNetOfTax**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Available-for-sale Securities and Other Assets Adjustment, Tax
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAndOtherAssetsAdjustmentTax**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Before Reclassifications, Before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Before Reclassifications, Net of Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Before Reclassifications, Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, Net of Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, Tax
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossDeferredAcquisitionCostsLifePolicyReservesAndOtherAdjustmentTax**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Adjustment Before Tax Period Increase Decrease
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Net of Tax, Period Increase (Decrease)
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Tax, Period Increase (Decrease)
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax
+ References
No definition available.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, before Tax
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, Net of Tax
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociOnAmortizationOfActuarialGainLossAndPriorServiceCostNetOfTax**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Amortization of Actuarial Gain (Loss) and Prior Service Cost, Tax
+ References
No definition available.
+ Details**Name:**cinf_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociOnAmortizationOfActuarialGainLossAndPriorServiceCostTax**Namespace Prefix:**cinf_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
+ References
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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
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| - Definition
The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
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| - Definition
Before tax amount, net of reclassifications, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income.
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Net of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss).
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Tax effect, net of reclassification adjustments, of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss).
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