Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net Income	$ 525us-gaap_NetIncomeLoss	$ 517us-gaap_NetIncomeLoss	$ 421us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51	50	44
Realized investment gains, net	(133)us-gaap_RealizedInvestmentGainsLosses	(83)us-gaap_RealizedInvestmentGainsLosses	(42)us-gaap_RealizedInvestmentGainsLosses
Share-based compensation	19us-gaap_ShareBasedCompensation	18us-gaap_ShareBasedCompensation	16us-gaap_ShareBasedCompensation
Interest credited to contract holders	47	44	44
Deferred income tax expense	37us-gaap_DeferredIncomeTaxExpenseBenefit	19us-gaap_DeferredIncomeTaxExpenseBenefit	26us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in:
Investment income receivable	(2)	(6)	4
Premiums and reinsurance recoverable	(60)	(64)	(122)
Deferred policy acquisition costs	(20)	(44)	(28)
Other assets	19	(32)	(4)
Loss and loss expense reserves	174	81	(109)
Life policy reserves	119	84	72
Unearned premiums	106	184	159
Other liabilities	(11)	77	78
Current income tax receivable/payable	2	(49)	79
Net cash provided by operating activities	873	796	638
Cash Flows From Investing Activities
Sale of fixed maturities	26	40	144
Call or maturity of fixed maturities	1,019	930	927
Sale of equity securities	335	178	216
Purchase of fixed maturities	(1,312)	(1,381)	(1,166)
Purchase of equity securities	(392)	(265)	(425)
Investment in finance receivables	(18)	(39)	(33)
Collection of finance receivables	31	30	34
Investment in buildings and equipment, net	(9)	(7)	(6)
Change in other invested assets, net	9	5	5
Net cash used in investing activities	(311)	(509)	(304)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(278)us-gaap_PaymentsOfDividendsCommonStock	(263)us-gaap_PaymentsOfDividendsCommonStock	(256)us-gaap_PaymentsOfDividendsCommonStock
Purchase of treasury shares	(21)	(52)	0
Payments on note payable	(55)	0	0
Proceeds from stock options exercised	22	25	10
Contract holders' funds deposited	86us-gaap_AdditionsToContractHoldersFunds	86us-gaap_AdditionsToContractHoldersFunds	99us-gaap_AdditionsToContractHoldersFunds
Contract holders' funds withdrawn	(143)	(128)	(126)
Excess tax benefits on share-based compensation	2	5	1
Other	(17)	(14)	(13)
Net cash used in financing activities	(404)	(341)	(285)
Net change in cash and cash equivalents	158	(54)	49
Cash and cash equivalents at beginning of year	433	487	438
Cash and cash equivalents at end of year	591	433	487
Supplemental Disclosures of Cash Flow Information:
Interest paid	53us-gaap_InterestPaidNet	53us-gaap_InterestPaidNet	54us-gaap_InterestPaidNet
Income taxes paid	154us-gaap_IncomeTaxesPaid	222us-gaap_IncomeTaxesPaid	38us-gaap_IncomeTaxesPaid
Noncash Activities:
Conversion of securities	7	0	26
Equipment acquired under capital lease obligations	12us-gaap_CapitalLeaseObligationsIncurred	28us-gaap_CapitalLeaseObligationsIncurred	23us-gaap_CapitalLeaseObligationsIncurred
Cashless exercise of stock options	$ 19cinf_PurchaseOfTreasurySharesNonCash	$ 28cinf_PurchaseOfTreasurySharesNonCash	$ 12cinf_PurchaseOfTreasurySharesNonCash

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 13

-Subparagraph (b)

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-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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- Definition

The cash outflow for the purchase of amounts due from customers, clients, lessees, borrowers, or others under the terms of its agreements therewith.

+ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Section 45

-Paragraph 12

-Subparagraph (a),(b)

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

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- Definition

Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash inflow associated with the sale or collection of receivables arising from the financing of goods and services.

+ References

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- Definition

The cash inflow associated with the sale of debt securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Paragraph 12

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The cash outflow for a segregated fund account during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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