Cincinnati Financial (CINF) 10-K 27 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 20, 2015	Jun. 30, 2014
Document Documentand Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	CINCINNATI FINANCIAL CORP
Entity Central Index Key	20286
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		164,166,327
Entity Public Float			$7,129,857,801

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments
Fixed maturities, at fair value (amortized cost: 2014—$8,871; 2013—$8,638)	$9,460	$9,121
Equity securities, at fair value (cost: 2014—$2,728; 2013—$2,523)	4,858	4,375
Other invested assets	68	68
Total investments	14,386	13,564
Cash and cash equivalents	591	433
Investment income receivable	123	121
Finance receivable	75	85
Premiums receivable	1,405	1,346
Reinsurance recoverable	545	547
Prepaid reinsurance premiums	29	26
Deferred policy acquisition costs	578	565
Land, building and equipment, net, for company use (accumulated depreciation: 2014—$446; 2013—$420)	194	210
Other assets	75	73
Separate accounts	752	692
Total assets	18,753	17,662
Insurance reserves
Loss and loss expense reserves	4,485	4,311
Life policy and investment contract reserves	2,497	2,390
Unearned premiums	2,082	1,976
Other liabilities	648	611
Deferred income tax	840	673
Note payable	49	104
Long-term debt and capital lease obligations	827	835
Separate accounts	752	692
Total liabilities	12,180	11,592
Commitments and contingent liabilities (Note 16)	0	0
Shareholders' Equity
Common stock, par value—$2 per share; (authorized: 2014 and 2013—500 million shares; issued: 2014 and 2013—198.3 million shares)	397	397
Paid-in capital	1,214	1,191
Retained earnings	4,505	4,268
Accumulated other comprehensive income	1,744	1,504
Treasury stock at cost (2014—34.6 million shares and 2013—35.2 million shares)	1,287	1,290
Total shareholders' equity	6,573	6,070
Total liabilities and shareholders' equity	$18,753	$17,662

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$8,871	$8,638
Equity securities, cost	2,728	2,523
Land, building and equipment, accumulated depreciation	$446	$420
Common stock, par value	$2	$2
common stock, authorized	500,000,000	500,000,000
Common stock, issued	198,300,000	198,300,000
Common stock, shares outstanding	198,300,000	198,300,000
Treasury stock, shares	34,600,000	35,200,000

Consolidated_Statements_Of_Inc

Consolidated Statements Of Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Earned premiums	$4,243	$3,902	$3,522
Investment income, net of expenses	549	529	531
Realized investment gains, net	133	83	42
Fee revenues	12	8	6
Other revenues	8	9	10
Total revenues	4,945	4,531	4,111
Benefits and Expenses
Insurance losses and policyholder benefits	2,856	2,505	2,322
Underwriting, acquisition and insurance expenses	1,301	1,243	1,155
Interest expense	53	54	54
Other operating expenses	14	15	14
Total benefits and expenses	4,224	3,817	3,545
Income Before Income Taxes	721	714	566
Provision for Income Taxes
Current	159	178	119
Deferred	37	19	26
Total provision for income taxes	196	197	145
Net Income	$525	$517	$421
Per Common Share
Net income—basic (in usd per share)	$3.21	$3.16	$2.59
Net income—diluted (in usd per share)	$3.18	$3.12	$2.57

Consolidated_Statements_Of_Com

Consolidated Statements Of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net Income	$525	$517	$421
Other Comprehensive Income
Unrealized gains on investments, net of tax of $134, $161, and $135, respectively	250	299	251
Amortization of pension actuarial loss and prior service cost, net of tax of $(6), $29, and $(4), respectively	-12	54	-9
Change in life deferred acquisition costs, life policy reserves and other, net of tax of $2, $12, and $(7), respectively	2	22	-14
Other comprehensive income, net of tax	240	375	228
Comprehensive Income	$765	$892	$649

Recovered_Sheet1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Unrealized gains on investments available-for-sale, net of tax	$134	$161	$135
Amortization of pension actuarial loss and prior service cost, net of tax	-6	29	-4
Change in life deferred acquisition costs, life policy reserves and other, net of tax	$2	$12	($7)

Consolidated_Statements_Of_Sha

Consolidated Statements Of Shareholders' Equity (USD $)	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
In Millions, except Share data
Beginning Balance at Dec. 31, 2011	$5,033	$393	$1,096	$3,863	$901	($1,220)
Beginning Balance (in shares) at Dec. 31, 2011		162,200,000
Net Income	421			421
Other comprehensive income, net	228				228
Dividends declared	-263			-263
Share-based awards exercised and vested (in shares)		700,000
Share-based awards exercised and vested	22	1	19			2
Share-based compensation	16		16
Treasury shares acquired—share repurchase authorization (in shares)		0
Treasury shares acquired—share repurchase authorization	0					0
Shares acquired under employee share-based compensation plans (in shares)		-300,000
Shares acquired under employee share-based compensation plans	-12					-12
Other (in shares)		300,000
Other	8		3			5
Ending Balance at Dec. 31, 2012	5,453	394	1,134	4,021	1,129	-1,225
Ending Balance (in shares) at Dec. 31, 2012		162,900,000
Net Income	517			517
Other comprehensive income, net	375				375
Dividends declared	-270			-270
Share-based awards exercised and vested (in shares)		1,600,000
Share-based awards exercised and vested	49	3	36			10
Share-based compensation	18		18
Treasury shares acquired—share repurchase authorization (in shares)		-1,000,000
Treasury shares acquired—share repurchase authorization	-52					-52
Shares acquired under employee share-based compensation plans (in shares)		-600,000
Shares acquired under employee share-based compensation plans	-28					-28
Other (in shares)		200,000
Other	8		3			5
Ending Balance at Dec. 31, 2013	6,070	397	1,191	4,268	1,504	-1,290
Ending Balance (in shares) at Dec. 31, 2013	198,300,000	163,100,000
Net Income	525			525
Other comprehensive income, net	240				240
Dividends declared	-288			-288
Share-based awards exercised and vested (in shares)	1,086,000	1,300,000
Share-based awards exercised and vested	37	0	0			37
Share-based compensation	19		19
Treasury shares acquired—share repurchase authorization (in shares)		-500,000
Treasury shares acquired—share repurchase authorization	-21					-21
Shares acquired under employee share-based compensation plans (in shares)		-400,000
Shares acquired under employee share-based compensation plans	-19					-19
Other (in shares)		200,000
Other	10		4			6
Ending Balance at Dec. 31, 2014	$6,573	$397	$1,214	$4,505	$1,744	($1,287)
Ending Balance (in shares) at Dec. 31, 2014	198,300,000	163,700,000

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net Income	$525	$517	$421
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51	50	44
Realized investment gains, net	-133	-83	-42
Share-based compensation	19	18	16
Interest credited to contract holders	47	44	44
Deferred income tax expense	37	19	26
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	-263	-256
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	86	86	99
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	53	53	54
Income taxes paid	154	222	38
Noncash Activities:
Conversion of securities	7	0	26
Equipment acquired under capital lease obligations	12	28	23
Cashless exercise of stock options	$19	$28	$12

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary Of Significant Accounting Policies	Summary of Significant Accounting Policies
	Nature of Operations
	Cincinnati Financial Corporation (CFC) operates through our insurance group and two complementary subsidiary companies.
	The Cincinnati Insurance Company leads our standard market property casualty insurance group that also includes two subsidiaries: The Cincinnati Casualty Company and The Cincinnati Indemnity Company. This group markets a broad range of standard market commercial and personal policies. The group focuses on delivery of quality customer service to our select group of 1,466 independent insurance agencies with 1,884 reporting locations across 39 states. Other subsidiaries of The Cincinnati Insurance Company include The Cincinnati Life Insurance Company, which markets life and disability income insurance and fixed annuities, and The Cincinnati Specialty Underwriters Insurance Company, which offers excess and surplus lines property casualty insurance products.
	The two CFC complementary subsidiaries are CSU Producer Resources Inc., which provides insurance brokerage services to our independent agencies so their clients can access our excess and surplus lines insurance products, and CFC Investment Company (CFC-I), which offers commercial leasing and financing services to our agents, their clients and other customers.
	Basis of Presentation
	Our consolidated financial statements include the accounts of the parent and its wholly owned subsidiaries and are presented in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation.
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Our actual results could differ from those estimates.
	Earnings per Share
	Net income per common share is based on the weighted average number of common shares outstanding during each of the respective years. We calculate net income per common share (diluted) assuming the exercise or conversion of share‑based awards using the treasury stock method.
	Share-Based Compensation
	We account for share-based compensation in accordance with Accounting Standards Codification (ASC) 718, Compensation – Stock Compensation. We grant qualified and nonqualified share-based compensation under authorized plans. The stock options vest ratably over three years following the date of grant and are exercisable over 10-year periods. We grant service-based restricted stock units that cliff vest three years after the date of grant. We also grant performance-based restricted stock units that vest if certain market conditions are attained. In 2014, the CFC compensation committee approved share-based awards including incentive stock options, nonqualified stock options, service-based restricted and performance-based restricted stock units. See Note 17, Share-Based Associate Compensation Plans, for further details.
	Employee Benefit Pension Plan
	We sponsor a defined benefit pension plan that was modified during 2008. We closed entry into the pension plan, and only participants 40 years of age or older could elect to remain in the plan. Our pension expense is based on certain actuarial assumptions and also is composed of several components that are determined using the projected unit credit actuarial cost method. Refer to Note 13, Employee Retirement Benefits, for more information about our defined benefit pension plan.
	Property Casualty Insurance
	The consolidated property casualty companies actively write property casualty insurance through independent agencies in 39 states. Our 10 largest states generated 62.8 percent and 63.8 percent of total earned premiums in 2014 and 2013, respectively. Ohio, our largest state, accounted for 17.7 percent and 18.5 percent of total earned premiums in 2014 and 2013, respectively. Illinois, Indiana, Pennsylvania, Georgia, Michigan and North Carolina each accounted for between 5 percent and 8 percent of total earned premiums in 2014. Our largest single agency relationship accounted for approximately 0.8 percent of our total property casualty earned premiums in 2014. No aggregate agency relationship locations under a single ownership structure accounted for more than 2.1 percent of our total property casualty earned premiums in 2014. We record revenues for installment charges as Fee revenues in the consolidated statements of income.
	Property casualty written premiums are deferred and recorded as earned premiums on a pro rata basis over the terms of the policies. We record as unearned premiums the portion of written premiums that applies to unexpired policy terms. Expenses associated with successfully acquiring insurance policies – commissions, premium taxes and underwriting costs – are deferred and amortized over the terms of the policies. All acquisition costs are in accordance with ASU 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. We assess recoverability of deferred acquisition costs at the segment level, consistent with the way we acquire, service and manage insurance policies and measure profitability. We analyze our acquisition cost assumptions to reflect actual experience, and we evaluate potential premium deficiencies.
	Certain property casualty policies are not entered into policy underwriting systems as of the effective date of coverage. An actuarial estimate is made to determine the amount of these unprocessed written premiums. A large majority of the estimate is unearned and has no material impact on earned premiums.
	Premiums receivable are reviewed for impairment on a quarterly basis. We maintain an allowance for uncollectible premiums.
	We establish reserves to cover the expected cost of claims, losses and expenses related to investigating, processing and resolving claims. Although the appropriate amount of reserves is inherently uncertain, we base our decisions on past experience and current facts. Reserves are based on claims reported prior to the end of the year and estimates of unreported claims. We take into account the fact that we may recover some of our costs through salvage and subrogation. We regularly review and update reserves using the most current information available. Any resulting adjustments are reflected in current calendar year insurance losses and policyholder benefits.
	Policyholder Dividends
	Certain workers’ compensation policies include the possibility of a policyholder earning a return of a portion of its premium in the form of a policyholder dividend. The dividend generally is calculated by determining the profitability of a policy year along with the associated premium. We reserve for all probable future policyholder dividend payments. We record policyholder dividends as other underwriting expenses.
	Life Insurance
	We offer several types of life insurance and disability income insurance, and we account for each according to the duration of the contract. Short-duration life and health contracts are written to cover claims that arise during a short, fixed term of coverage. We generally have the right to change the amount of premium charged or cancel the coverage at the end of each contract term. Group life insurance is an example. We record premiums for short-duration life and health contracts similarly to property casualty contracts.
	Long-duration contracts are written to provide coverage for an extended period of time. Traditional long-duration contracts require policyholders to pay scheduled gross premiums, generally not less frequently than annually, over the term of the coverage. Premiums for these contracts, such as whole life insurance and disability income insurance, are recognized as revenue when due. Some traditional long-duration contracts, such as ten-pay whole life insurance, have premium payment periods shorter than the period over which coverage is provided. For these contracts, the excess of premium over the amount required to pay expenses and benefits is recognized over the term of the coverage rather than over the premium payment period.
	We establish a liability for traditional long-duration contracts as we receive premiums. The amount of this liability is the present value of future expenses and benefits less the present value of future net premiums. Net premium is the portion of gross premium required to provide for all expenses and benefits. We estimate future expenses and benefits and net premium using assumptions for expected expenses, mortality, morbidity, withdrawal rates and investment income. We include a provision for deviation, meaning we allow for some uncertainty in making our assumptions. We establish our assumptions when the contract is issued, and we generally maintain those assumptions for the life of the contract. We use both our own experience and industry experience, adjusted for historical trends, in arriving at our assumptions for expected mortality, morbidity and withdrawal rates. We use our own experience and historical trends for setting our assumption for expected expenses. We base our assumption for expected investment income on our own experience, adjusted for current economic conditions.
	We capitalize acquisition costs for traditional long-duration contracts. We charge these capitalized costs associated with successfully acquiring traditional long-duration contract insurance policies over the premium-paying period of the policies. We use the same assumptions used in establishing the liability for the contract. All acquisition costs reflect the retrospective adoption of Accounting Standards Update (ASU) 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate our deferred acquisition cost for recoverability.
	Universal life contracts are long-duration contracts for which contractual provisions are not fixed, unlike whole life insurance. Universal life contracts allow policyholders to vary the amount of premium, within limits, without our consent. However, we may vary the mortality, expense charges and the interest crediting rate, within limits, used to accumulate policy values. We do not record universal life premiums as revenue. Instead we recognize as revenue the mortality charges, administration charges and surrender charges when received. Some of our universal life contracts assess administration charges in the early years of the contract that are compensation for services we will provide in the later years of the contract. These administration charges are deferred and are recognized over the period when we provide those future services.
	We maintain a liability equal to the policyholder account value. There is no provision for adverse deviation. Some of our universal life policies contain no-lapse guarantee provisions. For these policies, we establish a reserve in addition to the account balance, based on expected no-lapse guarantee benefits and expected policy assessments.
	We capitalize acquisition costs for universal life long-duration contracts. We charge these capitalized costs to expenses over the term of coverage of the contract in accordance with the recognition of gross profit from the contract. When we charge deferred policy acquisition costs to expenses, we use assumptions based on our best estimates of long-term experience. We review and modify these assumptions on a regular basis.
	Separate Accounts
	We have issued universal life contracts with guaranteed minimum returns, referred to as bank-owned life insurance contracts (BOLIs). A BOLI is designed so the bank is the policy owner and the policy beneficiary. We legally segregate and record as separate accounts the assets and liabilities for some of our BOLIs, based on the specific contract provisions. We guarantee minimum investment returns, account values and death benefits for our separate account BOLIs. Our other BOLIs are general account products.
	We carry the assets of separate account BOLIs at fair value. The liabilities on separate account BOLIs primarily are the contract holders’ claims to the related assets and are carried at an amount equal to the contract holders’ account value. At December 31, 2014, the current fair value of the BOLI invested assets and cash exceeded the current fair value of the contract holders’ account value by approximately $47 million. If the BOLI projected fair value were to fall below the value we guaranteed, a liability would be established with a corresponding charge to the company’s earnings.
	Generally, investment income and realized investment gains and losses of the separate accounts accrue directly to the contract holder, and we do not include them in the consolidated statements of income. Revenues and expenses related to separate accounts consist of contractual fees and mortality, surrender and expense risk charges. Also, each separate account BOLI includes a negotiated capital gain and loss sharing arrangement between the company and the bank. A percentage of each separate account’s realized capital gain and loss representing contract fees and assessments accrues to us and is transferred from the separate account to our general account and is recognized as revenue or expense. We record as revenues separate account investment management fees in Fee revenues of the consolidated statements of income.
	Reinsurance
	We reduce risk and uncertainty by buying property casualty and life reinsurance. Reinsurance contracts do not relieve us from our obligation to policyholders, but rather help protect our financial strength to perform that duty. All of these ceded reinsurance contracts transfer the economic risk of loss. We continue to assume risk with limited exposure as a reinsurer for other insurance companies, reinsurers and involuntary state pools.
	Both reinsurance assumed and ceded premiums are deferred and recorded as earned premiums on a pro rata basis over the terms of the contract. We estimate loss amounts recoverable from our reinsurers based on the reinsurance policy terms. Historically, our claims with reinsurers have been paid. We do not have an allowance for uncollectible reinsurance.
	Cash and Cash Equivalents
	Cash and cash equivalents are highly liquid instruments that include liquid debt instruments with original maturities of less than three months. These are carried at cost, which approximates fair value.
	Investments
	Our portfolio investments are primarily in publicly traded fixed-maturity, equity and short-term investments. Fixed-maturity investments (taxable bonds, tax-exempt bonds, redeemable preferred equities and commercial mortgage backed securities) and equity investments (common and nonredeemable preferred equities) are classified as available for sale and recorded at fair value in the consolidated financial statements. The number of fixed-maturity securities with fair value below 100 percent of amortized cost can be expected to fluctuate as interest rates rise or fall. Because of our strong surplus and long-term investment horizon, our general intent is to hold fixed-maturity investments until maturity, regardless of short-term fluctuations in fair values.
	Our invested asset impairment policy states that fixed maturities below their amortized cost that the company (1) intends to sell or (2) more likely than not will be required to sell before recovery of their amortized cost basis are deemed to be other-than-temporarily impaired (OTTI). The amortized cost of any such securities is reduced to fair value as the new cost basis, and a realized loss is recorded in the period in which it is recognized. When these two criteria are not met, and the company believes that full collection of interest and/or principal is not likely, we determine the net present value of future cash flows by using the effective interest rate implicit in the security at the date of acquisition as the discount rate and compare that amount with the amortized cost and fair value of the security. The difference between the net present value of the expected future cash flows and amortized cost of the security is considered a credit loss and recognized as a realized loss in the period in which it occurred. The difference between the fair value and the net present value of the cash flows of the security, the noncredit loss, is recognized in other comprehensive income as an unrealized loss. We had no fixed-maturity securities with a noncredit loss for the years ended 2014 and 2013.
	When determining OTTI charges for our equity portfolio, our invested asset impairment policy considers qualitative and quantitative factors, including facts and circumstances specific to individual securities, asset classes, the financial condition of the issuer, changes in dividend payment, the length of time fair value had been less than cost, the severity of the decline in fair value below cost, the volatility of the security and our ability and intent to hold each position until its forecasted recovery.
	We include the noncredit portion of fixed-maturity OTTI charges and all other unrealized gains and losses on investments, net of taxes, in shareholders’ equity as accumulated other comprehensive income (AOCI). Realized gains and losses on investments are recognized in net income based on the trade date accounting method.
	Included within our other invested assets are $31 million of life policy loans and $37 million of private equity investments. Life policy loans are carried at the receivable value. The private equity investments provide their financial statements to us and generally report investments on their balance sheets at fair value. We use the equity method of accounting for private equity investments.
	Investment income consists mainly of interest and dividends. We record interest on an accrual basis and record dividends at the ex-dividend date. We amortize premiums and discounts on fixed-maturity securities using the effective interest method over the expected life of the security.
	Fair Value Disclosures
	We account for our investment portfolio at fair value and apply fair value measurements as defined by ASC 820, Fair Value Measurements and Disclosures, to financial instruments. Fair value is applicable to ASC 320, Investments-Debt and Equity Securities, and ASC 825, Financial Instruments.
	ASC 820 defines fair value as the exit price or the amount that would be (1) received to sell an asset or (2) paid to transfer a liability in an orderly transaction between marketplace participants at the measurement date. When determining an exit price, we rely upon observable market data whenever possible. We primarily base fair value for investments in equity and fixed-maturity securities (including redeemable preferred stock and assets held in separate accounts) on quoted market prices or on prices from a pricing vendor, an outside resource that supplies global securities pricing, dividend, corporate action and descriptive information to support fund pricing, securities operations, research and portfolio management. The company obtains and reviews the pricing service’s valuation methodologies and related inputs and validates these prices by replicating a sample across each asset class using a discounted cash flow model. When a price is not available from these sources, as in the case of securities that are not publicly traded, we determine the fair value using various inputs including quotes from independent brokers. The fair value of investments not priced by a pricing vendor is less than 1 percent of the fair value of our total investment portfolio.
	For the purpose of ASC 825 disclosure, we base fair value for long-term senior notes on market pricing of similar debt instruments that are actively trading. We base fair value for notes payable on our year-end outstanding balance because it is short term and tied to a variable interest rate. We estimate the fair value of liabilities for investment contracts and annuities using discounted cash flow calculations across a wide range of economic interest rate scenarios with a provision for our nonperformance risk. We estimate the fair value for policyholder loans on insurance contracts using a discounted cash flow model. Determination of fair value for structured settlements assumes the discount rates used to calculate the present value of expected payments are the risk-free spot rates plus an A3 rated bond spread for financial issuers at December 31, 2014, to account for nonperformance risk. See Note 3, Fair Value Measurements, for further details.
	Land, Building and Equipment
	We record land at cost, and record building and equipment at cost less accumulated depreciation. Equipment held under capital leases also is classified as property and equipment with the related lease obligations recorded as liabilities. We capitalize and amortize costs for internally developed computer software during the application development stage. These costs generally consist of external consulting, payroll and payroll-related costs. Our depreciation is based on estimated useful lives (ranging from three years to 39.5 years) using straight-line and accelerated methods. Depreciation expense was $37 million for each year in 2014, 2013 and 2012. We monitor land, building and equipment and software assets for potential impairments. Potential impairments may include a significant decrease in the fair values of the assets, considerable cost overruns on projects, a change in legal factors or business climate or other factors that indicate that the carrying amount may not be recoverable or useful. There were no recorded land, building and equipment impairments for 2014, 2013 or 2012.
	Income Taxes
	We calculate deferred income tax liabilities and assets using tax rates in effect when temporary differences in financial statement income and taxable income are expected to reverse. We recognize deferred income taxes for numerous temporary differences between our taxable income and financial statement income and other changes in shareholders’ equity. Such temporary differences relate primarily to unrealized gains and losses on investments and differences in the recognition of deferred acquisition costs, unearned premium and insurance reserves. We charge deferred income taxes associated with balances that impact other comprehensive income, such as unrealized appreciation and depreciation of investments (except the amounts related to the effect of income tax rate changes), to shareholders’ equity in AOCI. We charge deferred taxes associated with other differences to income.
	See Note 11, Income Taxes, for further detail on our uncertain tax positions. Although no Internal Revenue Service (IRS) penalties currently are accrued, if incurred, they would be recognized as a component of income tax expense.
	Finance Receivables
	Our leasing subsidiary provides auto and equipment direct financing (leases and loans) to commercial and individual clients. We generally transfer ownership of the property to the client as the terms of the leases expire. Our lease contracts contain bargain purchase options. We account for these leases and loans as direct financing-type leases. We capitalize and amortize lease or loan origination costs over the life of the financing, using the effective interest method. These costs may include, but are not limited to finder fees, broker fees, filing fees and the cost of credit reports. We record income in the Other revenues of the consolidated statements of income over the financing term using the effective interest method. Finance receivables are reviewed for impairment on a quarterly basis and considered insignificant to our consolidated financial condition, results of operations and cash flows.
	Subsequent Events
	There were no subsequent events requiring adjustment to the financial statements or disclosure.
	Pending Accounting Updates
	ASU 2014-09, Revenue from Contracts with Customers
	In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. Insurance contracts do not fall within the scope of this ASU. The effective date of ASU 2014-09 is for annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, there is not expected to be a material impact on our company’s consolidated financial position, cash flows or results of operations.
	ASU 2014-12, Compensation-Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period
	In June 2014, the FASB Issued ASU 2014-12, Compensation-Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that performance targets that affect vesting and that could be achieved after the requisite service period be treated as performance conditions. The effective date of ASU 2014-12 is for interim and annual reporting periods beginning after December 15, 2015. The ASU has not yet been adopted and will not have a material impact on our company’s consolidated financial position, cash flows or results of operations.
ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis
In February 2015, the FASB Issued ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 makes amendments to the current consolidation guidance, focusing mainly on the investment management industry; however entities across all industries will be impacted. The effective date of ASU 2015-02 is for interim and annual reporting periods beginning after December 15, 2015. The ASU has not yet been adopted; however, there is not expected to be a material impact on our company’s consolidated financial position, cash flows or results of operations.

Investments

Investments	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Investments	Investments
	The following table provides cost or amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity and equity securities:
	(Dollars in millions)	Cost or			Gross unrealized						Fair
		amortized									value
	At December 31, 2014	cost			gains			losses
	Fixed-maturity securities:
	Corporate	$	5,117		$	420		$	11		$	5,526
	States, municipalities and political subdivisions	3,267			178			2			3,443
	Commercial mortgage-backed	250			9			—			259
	Government-sponsored enterprises	213			—			5			208
	Foreign government	10			—			—			10
	Convertibles and bonds with warrants attached	7			—			—			7
	United States government	7			—			—			7
	Subtotal	8,871			607			18			9,460
	Equity securities:
	Common equities	2,583			2,099			3			4,679
	Nonredeemable preferred equities	145			35			1			179
	Subtotal	2,728			2,134			4			4,858
	Total	$	11,599		$	2,741		$	22		$	14,318
	At December 31, 2013
	Fixed-maturity securities:
	Corporate	$	5,122		$	433		$	22		$	5,533
	States, municipalities and political subdivisions	3,107			125			21			3,211
	Commercial mortgage-backed	148			—			5			143
	Government-sponsored enterprises	227			—			27			200
	Foreign government	10			—			—			10
	Convertibles and bonds with warrants attached	17			—			—			17
	United States government	7			—			—			7
	Subtotal	8,638			558			75			9,121
	Equity securities:
	Common equities	2,396			1,818			1			4,213
	Nonredeemable preferred equities	127			38			3			162
	Subtotal	2,523			1,856			4			4,375
	Total	$	11,161		$	2,414		$	79		$	13,496
	The net unrealized investment gains in our fixed-maturity portfolio are primarily the result of the continued low interest rate environment that has increased the fair value of our fixed-maturity portfolio. The seven largest net unrealized investment gains in our common stock portfolio are from Exxon Mobil Corporation (NYSE:XOM), The Procter & Gamble Company (NYSE:PG), Honeywell International Incorporated (NYSE:HON), BlackRock Inc. (NYSE:BLK), Genuine Parts Company (NYSE:GPC), RPM International (NYSE:RPM) and Johnson and Johnson (NYSE:JNJ), which had a combined net gain position of $619 million. At December 31, 2014, Apple Inc. (Nasdaq:AAPL) was our largest single combined stock holding with a fair value of 3.3 percent of our publicly traded common stock portfolio and 1.1 percent of the total investment portfolio.
	The table below provides fair values and unrealized losses by investment category and by the duration of the securities’ continuous unrealized loss position:
	(Dollars in millions)	Less than 12 months						12 months or more					Total
	At December 31, 2014	Fair			Unrealized			Fair			Unrealized		Fair		Unrealized
		value			losses			value			losses		value		losses
	Fixed maturity securities:
	Corporate	$	261		$	8		$	90		$	3	$	351	$	11
	States, municipalities and political subdivisions	17			—			135			2		152		2
	Commercial mortgage-backed	3			—			23			—		26		—
	Government-sponsored enterprises	11			—			181			5		192		5
	Subtotal	292			8			429			10		721		18
	Equity securities:
	Common equities	85			3			—			—		85		3
	Nonredeemable preferred equities	16			—			17			1		33		1
	Subtotal	101			3			17			1		118		4
	Total	$	393		$	11		$	446		$	11	$	839	$	22
	At December 31, 2013
	Fixed maturity securities:
	Corporate	$	572		$	20		$	43		$	2	$	615	$	22
	States, municipalities and political subdivisions	490			18			42			3		532		21
	Commercial mortgage-backed	125			5			—			—		125		5
	Government-sponsored enterprises	199			27			1			—		200		27
	Foreign government	10			—			—			—		10		—
	United States government	1			—			—			—		1		—
	Subtotal	1,397			70			86			5		1,483		75
	Equity securities:
	Common equities	77			1			—			—		77		1
	Nonredeemable preferred equities	42			3			—			—		42		3
	Subtotal	119			4			—			—		119		4
	Total	$	1,516		$	74		$	86		$	5	$	1,602	$	79
Contractual maturity dates for fixed-maturity investments were:
(Dollars in millions)	Amortized cost			Fair			% of fair value
At December 31, 2014				value
Maturity dates occurring:
Less than 1 year	$	502		$	509		5.4	%
Years 1 - 5	3,404			3,687			39
Years 5 - 10	3,322			3,506			37
Due after ten years	1,643			1,758			18.6
Total	$	8,871		$	9,460		100	%
Actual maturities may differ from contractual maturities when there is a right to call or prepay obligations with or without call or prepayment penalties.
At December 31, 2014, fixed-maturity investments with amortized cost of $75 million and fair value of $78 million were on deposit with various states in compliance with regulatory requirements. At December 31, 2013, fixed‑maturity investments with amortized cost of $80 million and fair value of $84 million were on deposit with various states in compliance with regulatory requirements.
The following table provides investment income, realized investment gains and losses and the change in unrealized investment gains and losses, by investment category:
(Dollars in millions)	Years ended December 31,
	2014			2013			2012
Investment income:
Interest	$	417		$	413		$	420
Dividends	138			122			115
Other	2			3			3
Total	557			538			538
Less investment expenses	8			9			7
Total	$	549		$	529		$	531
Realized investment gains and losses summary:
Fixed maturities:
Gross realized gains	$	21		$	15		$	36
Gross realized losses	(3		)	—			—
Other-than-temporary impairments	(15		)	(2		)	(1		)
Equity securities:
Gross realized gains	136			64			39
Gross realized losses	—			—			(2		)
Other-than-temporary impairments	(9		)	—			(32		)
Other	3			6			2
Total	$	133		$	83		$	42
Change in unrealized investment gains and losses:
Fixed maturities	$	106		$	(387	)	$	176
Equity securities	278			847			210
Less income taxes	134			161			135
Total	$	250		$	299		$	251
For the years ended December 31, 2014, 2013 and 2012, there were no credit losses on fixed-maturity securities for which a portion of OTTI has been recognized in other comprehensive income.
During 2014, we other-than-temporarily impaired six securities. At December 31, 2014, 144 fixed-maturity investments with a total unrealized loss of $10 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were three equity security investments in an unrealized loss position for 12 months or more with a total unrealized loss of $1 million as of December 31, 2014. Of that total, no equity security investments had fair values below 70 percent of cost.
During 2013, we other-than-temporarily impaired seven securities. At December 31, 2013, 40 fixed-maturity investments with a total unrealized loss of $5 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were no equity security investments in an unrealized loss position for 12 months or more as of December 31, 2013.
During 2012, we other-than-temporarily impaired 13 securities. At December 31, 2012, four fixed-maturity investments with a total unrealized loss of $1 million had been in an unrealized loss position for 12 months or more. Of that total, no fixed-maturity investments had fair values below 70 percent of amortized cost. There were no equity security investments in an unrealized loss position for 12 months or more as of December 31, 2012.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements
	Fair Value Hierarchy
	The fair value hierarchy gives the highest priority to quoted prices with readily available independent data in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable market inputs (Level 3). When various inputs for measurement fall within different levels of the fair value hierarchy, the lowest observable input that has a significant impact on fair value measurement is used. Our valuation techniques have not changed from those used at December 31, 2013, and ultimately management determines fair value. Financial instruments reported at fair value in our consolidated financial statements are categorized based upon the following characteristics or inputs to the valuation techniques:
	•	Level 1 – Financial assets and liabilities for which inputs are observable and are obtained from reliable quoted prices for identical assets or liabilities in active markets. This is the most reliable fair value measurement and includes, for example, active exchange-traded equity securities.
	•	Level 2 – Financial assets and liabilities for which values are based on quoted prices in markets that are not active or for which values are based on similar assets and liabilities that are actively traded. This also includes pricing models for which the inputs are corroborated by market data.
	•	Level 3 – Financial assets and liabilities for which values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. Level 3 inputs include the following:
	◦	Quotes from brokers or other external sources that are not considered binding;
	◦	Quotes from brokers or other external sources where it cannot be determined that market participants would in fact transact for the asset or liability at the quoted price; or
	◦	Quotes from brokers or other external sources where the inputs are not deemed observable.
	The technique used for the Level 2 fixed-maturity securities and taxable fixed maturities in separate accounts is the application of matrix pricing. The inputs used include relevant market information by asset class, trade activity of like securities, yield to maturity and economic events. All of the Level 2 fixed-maturity securities are priced by a nationally recognized pricing vendor.
	The Level 2 nonredeemable preferred equities technique used is the application of matrix pricing. The inputs used, similar to those used by the pricing vendor for our fixed-maturity securities, include relevant market information, trade activity of like securities, yield to maturity, corporate action notices and economic events. All of the Level 2 nonredeemable preferred equities are priced by a nationally recognized pricing vendor.
	The following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at December 31, 2014 and 2013. We do not have any material liabilities carried at fair value. There were no transfers between Level 1 and Level 2 for the years ended December 31, 2014 and 2013.
	(Dollars in millions)		Quoted prices in						Significant
			active markets for						unobservable
			identical assets						inputs
	At December 31, 2014		(Level 1)			Significant other			(Level 3)		Total
						observable inputs
						(Level 2)
	Fixed maturities, available for sale:
	Corporate		$	—		$	5,508		$	18	$	5,526
	States, municipalities and political subdivisions		—			3,443			—		3,443
	Commercial mortgage-backed		—			259			—		259
	Government-sponsored enterprises		—			208			—		208
	Foreign government		—			10			—		10
	Convertibles and bonds with warrants attached		—			7			—		7
	United States government		7			—			—		7
	Subtotal		7			9,435			18		9,460
	Common equities, available for sale		4,679			—			—		4,679
	Nonredeemable preferred equities, available for sale		—			177			2		179
	Separate accounts taxable fixed maturities		—			731			—		731
	Top Hat Savings Plan - mutual funds and common equities (included in Other assets)		18			—			—		18
	Total		$	4,704		$	10,343		$	20	$	15,067
	At December 31, 2013
	Fixed maturities, available for sale:
	Corporate		$	—		$	5,531		$	2	$	5,533
	States, municipalities and political subdivisions		—			3,211			—		3,211
	Commercial mortgage-backed		—			143			—		143
	Government-sponsored enterprises		—			200			—		200
	Foreign government		—			10			—		10
	Convertibles and bonds with warrants attached		—			17			—		17
	United States government		7			—			—		7
	Subtotal		7			9,112			2		9,121
	Common equities, available for sale		4,213			—			—		4,213
	Nonredeemable preferred equities, available for sale		—			160			2		162
	Separate accounts taxable fixed maturities		—			682			—		682
	Top Hat Savings Plan - mutual funds and common equities (included in Other assets)		14			—			—		14
	Total		$	4,234		$	9,954		$	4	$	14,192
	Each financial instrument that was deemed to have significant unobservable inputs when determining valuation is identified in the following tables by security type with a summary of changes in fair value for the years ended December 31, 2014 and 2013. Total Level 3 assets continue to be less than 1 percent of financial assets measured at fair value in the consolidated balance sheets. Assets presented in the table below were valued based primarily on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations. Transfers into Level 3 included situations where a fair value quote was not provided by the company's nationally recognized pricing vendor and as a result the price was stale or had been replaced with a broker quote where the inputs had not been corroborated to be market observable resulting in the security being classified as Level 3. Transfers out of Level 3 included situations where a broker quote was used in the prior period and a fair value quote became available from the company's pricing vendor in the current period. A quote utilizing the new pricing source was not available as of the prior period, and any gains or losses related to the change in valuation source for individual securities were not significant.
	The quantitative detail of these unobservable inputs is neither provided nor reasonably available to us.
	The following table provides the change in Level 3 assets during 2014 and 2013:
	(Dollars in millions)	Asset fair value measurements using significant unobservable inputs (Level 3)
			Corporate			States,			Nonredeemable preferred		Total
			fixed			municipalities			equities
			maturities			and political
						subdivisions
						fixed maturities
	Beginning balance, January 1, 2014		$	2		$	—		$	2	$	4
	Total gains or losses (realized/unrealized):
	Included in net income		—			—			—		—
	Included in other comprehensive income		—			—			—		—
	Purchases		—			—			—		—
	Sales		—			—			—		—
	Transfers into Level 3		16			—			—		16
	Transfers out of Level 3		—			—			—		—
Ending balance, December 31, 2014		$	18		$	—		$	2	$	20
Beginning balance, January 1, 2013		$	3		$	1		$	1	$	5
Total gains or losses (realized/unrealized):
Included in net income		—			—			—		—
Included in other comprehensive income		—			—			—		—
Purchases		—			—			1		1
Sales		—			(1		)	—		(1		)
Transfers into Level 3		—			—			—		—
Transfers out of Level 3		(1		)	—			—		(1		)
Ending balance, December 31, 2013		$	2		$	—		$	2	$	4
With the exception of the Level 3 rollforward table, additional disclosure for the Level 3 category is not material.
Fair Value Disclosure for Assets and Liabilities Not Carried at Fair Value
The disclosures below are presented to provide information about the effects of current market conditions on financial instruments that are not reported at fair value in our consolidated financial statements.
The following table shows fair values of our note payable and long-term debt:
(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
		active markets for			observable inputs			unobservable
		identical assets			(Level 2)			inputs
At December 31, 2014		(Level 1)						(Level 3)
Note payable		$	—		$	49		$	—	$	49
6.900% senior debentures, due 2028		—			34			—		34
6.920% senior debentures, due 2028		—			496			—		496
6.125% senior notes, due 2034		—			449			—		449
Total		$	—		$	1,028		$	—	$	1,028
At December 31, 2013
Note payable		$	—		$	104		$	—	$	104
6.900% senior debentures, due 2028		—			30			—		30
6.920% senior debentures, due 2028		—			458			—		458
6.125% senior notes, due 2034		—			399			—		399
Total		$	—		$	991		$	—	$	991
Fair value of the note payable was determined based upon the outstanding balance at December 31, 2014 and 2013, because it is short term and tied to a variable interest rate. The note payable was classified as Level 2 as a market does not exist.
Fair value of the long-term debt was determined under the fair value measurements and disclosure accounting rules based on market pricing of similar debt instruments that are actively trading. We determine fair value for our debt the same way that we value corporate fixed maturities in our investment portfolio. Fair value can vary with macroeconomic conditions. Regardless of the fluctuations in fair value, the outstanding principal amount of our long-term debt is $793 million at both December 31, 2014 and 2013. None of the long-term debt is encumbered by rating triggers.
The following table shows the fair value of our life policy loans, included in other invested assets:
(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
		active markets for			observable inputs			unobservable
		identical assets			(Level 2)			inputs
At December 31, 2014		(Level 1)						(Level 3)
Life policy loans		$	—		$	—		$	39	$	39
At December 31, 2013
Life policy loans		$	—		$	—		$	45	$	45
Recorded outstanding principal and interest for these life policy loans were $31 million and $36 million at December 31, 2014 and 2013, respectively. To determine the fair value, we make the following significant assumptions: (1) the discount rates used to calculate the present value of expected payments are the risk-free spot rates, as nonperformance risk is minimal; and (2) the loan repayment rate by which policyholders pay off their loan balances is in line with past experience.
The following table shows fair value of our deferred annuities and structured settlements included in life policy and investment contract reserves:
(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
		active markets for			observable inputs			unobservable
		identical assets			(Level 2)			inputs
At December 31, 2014		(Level 1)						(Level 3)
Deferred annuities		$	—		$	—		$	897	$	897
Structured settlements		—			217			—		217
Total		$	—		$	217		$	897	$	1,114
At December 31, 2013
Deferred annuities		$	—		$	—		$	911	$	911
Structured settlements		—			219			—		219
Total		$	—		$	219		$	911	$	1,130
Recorded reserves for the deferred annuities were $863 million and $862 million at December 31, 2014 and 2013, respectively. Recorded reserves for the structured settlements were $182 million and $189 million at December 31, 2014 and 2013, respectively.
Fair values for deferred annuities were calculated based upon internally developed models because active, observable markets do not exist for those items. To determine the fair value, we made the following significant assumptions: (1) the discount rates used to calculate the present value of expected payments are the risk-free spot rates plus an A3 rated bond spread for financial issuers at December 31, 2014 and 2013, to account for nonperformance risk; (2) the rate of interest credited to policyholders is the portfolio net earned interest rate less a spread for expenses and profit; and (3) additional lapses occur when the credited interest rate is exceeded by an assumed competitor credited rate, which is a function of the risk-free rate of the economic scenario being modeled.
Determination of fair value for structured settlements assumes the discount rates used to calculate the present value of expected payments are the risk-free spot rates plus an A3 rated bond spread for financial issuers at December 31, 2014 and 2013, to account for nonperformance risk.

Property_Casualty_Loss_And_Los

Property Casualty Loss And Loss Expenses	12 Months Ended
	Dec. 31, 2014
Insurance [Abstract]
Property Casualty Loss And Loss Expenses	Property Casualty Loss and Loss Expenses
	This table summarizes activity for our consolidated property casualty loss and loss expense reserves:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Gross loss and loss expense reserves, January 1	$	4,241		$	4,169		$	4,280
	Less reinsurance recoverable	299			356			375
	Net loss and loss expense reserves, January 1	3,942			3,813			3,905
	Net incurred loss and loss expenses related to:
	Current accident year	2,725			2,448			2,533
	Prior accident years	(98		)	(147		)	(396		)
	Total incurred	2,627			2,301			2,137
	Net paid loss and loss expenses related to:
	Current accident year	1,212			1,045			1,123
	Prior accident years	1,201			1,127			1,106
	Total paid	2,413			2,172			2,229
	Net loss and loss expense reserves, December 31	4,156			3,942			3,813
	Plus reinsurance recoverable	282			299			356
	Gross loss and loss expense reserves, December 31	$	4,438		$	4,241		$	4,169
	We use actuarial methods, models and judgment to estimate, as of a financial statement date, the property casualty loss and loss expense reserves required to pay for and settle all outstanding insured claims, including incurred but not reported (IBNR) claims, as of that date. The actuarial estimate is subject to review and adjustment by an
	inter-departmental committee that includes actuarial management that is familiar with relevant company and industry business, claims and underwriting trends, as well as general economic and legal trends that could affect future loss and loss expense payments. The amount we will actually have to pay for claims can be highly uncertain. This uncertainty, together with the size of our reserves, makes the loss and loss expense reserves our most significant estimate. The reserve for loss and loss expenses in the consolidated balance sheets also includes
	$47 million, $70 million and $61 million for certain accident, life and health loss reserves at December 31, 2014, 2013 and 2012, respectively.
	During 2014, we experienced $98 million of favorable development on prior accident years including $57 million of favorable development in commercial lines, $12 million of favorable development in personal lines and $29 million of favorable development in excess and surplus lines. Favorable development in 2014 was $49 million less than in 2013, largely due to the change in prior accident years before catastrophes. Overall favorable development for commercial lines reserves illustrated the potential for revisions inherent in estimating reserves, especially for long-tail lines such as commercial casualty and workers’ compensation. We recognized favorable reserve development of $51 million for the workers’ compensation line, $34 million for the commercial property line and $14 million for the homeowner line, due to reduced uncertainty of prior accident year loss and loss adjustment expense for these lines. Our commercial casualty line experienced $5 million of adverse development due to an increase in its paid loss and loss expenses for cumulative accident years three or more years old, resulting in an increase recognized in estimates for IBNR losses and loss expenses for all prior accident years in total compared to 2013 and 2012. Our commercial auto line developed unfavorably by $39 million during 2014 due to higher loss cost effects in recent accident years, resulting in an increase of our reserve estimate for claims that have not yet been settled.
	During 2013, we experienced $147 million of favorable development on prior accident years including $95 million
	of favorable development in commercial lines, $39 million of favorable development in personal lines and $13 million of favorable development in excess and surplus lines. Favorable development in 2013 was $249 million less than in 2012, largely due to the change in prior accident years before catastrophes. Overall favorable development for commercial lines reserves illustrated the potential for revisions inherent in estimating reserves, especially for long-tail lines such as commercial casualty and workers’ compensation. We recognized favorable reserve development of $70 million for the commercial casualty line, $22 million for the commercial property line, $14 million for the workers' compensation line and $19 million for the homeowner line, due to reduced uncertainty of prior accident year loss and loss adjustment expense for these lines.
	During 2012, we experienced $396 million of favorable development on prior accident years including $292 million of favorable development in commercial lines, $99 million of favorable development in personal lines and $5 million of favorable development in excess and surplus lines. Overall favorable development for commercial lines reserves illustrated the potential for revisions inherent in estimating reserves, especially for long-tail lines such as commercial casualty and workers’ compensation. We recognized favorable reserve development of $177 million for the commercial casualty line, $74 million for the workers’ compensation line and $52 million for the homeowner line, due to reduced uncertainty of prior accident year loss and loss adjustment expense for these lines.
	Asbestos and Environmental Reserves
	We carried $81 million of net loss and loss expense reserves for asbestos and environmental claims and
	$51 million of reserves for mold claims at December 31, 2014, compared with $77 million and $51 million, respectively, at December 31, 2013. The asbestos and environmental claims amounts for each respective year constituted 2.0 percent and 1.9 percent of total net loss and loss expense reserves at these year-end dates.
	We believe our exposure to asbestos and environmental claims is limited, largely because our reinsurance retention was $500,000 or below prior to 1987. We also were predominantly a personal lines company in the 1960s and 1970s. During the 1980s and early 1990s, commercial lines grew as a percentage of our overall business and our exposure to asbestos and environmental claims grew accordingly. Over that period, we included an asbestos and environmental exclusion in most policies or endorsed the exclusion to the policies. We have not engaged in any mergers or acquisitions through which such a liability could have been assumed. We continue to monitor our claims for evidence of material exposure to other mass tort classes such as silicosis, but we have found no such credible evidence to date.

Life_Policy_And_Investment_Con

Life Policy And Investment Contract Reserves	12 Months Ended
	Dec. 31, 2014
Liability for Future Policy Benefits [Abstract]
Life Policy And Investment Contract Reserves	Life Policy and Investment Contract Reserves
	We establish the reserves for traditional life insurance policies based on expected expenses, mortality, morbidity, withdrawal rates, timing of claim presentation and investment yields, including a provision for uncertainty. Once these assumptions are established, they generally are maintained throughout the lives of the contracts. We use both our own experience and industry experience, adjusted for historical trends, in arriving at our assumptions for expected mortality, morbidity and withdrawal rates as well as for expected expenses. We base our assumptions for expected investment income on our own experience adjusted for current economic conditions.
	We establish reserves for the company’s universal life, deferred annuity and structured settlement policies equal to the cumulative account balances, which include premium deposits plus credited interest less charges and withdrawals. Some of our universal life policies contain no-lapse guarantee provisions. For these policies, we establish a reserve in addition to the account balance, based on expected no-lapse guarantee benefits and expected policy assessments.
	This table summarizes our life policy and investment contract reserves:
	(Dollars in millions)	At December 31,
		2014		2013
	Ordinary/traditional life	$	875	$	815
	Deferred annuities	863		862
	Universal life	530		508
	Structured settlements	182		189
	Other	47		16
	Total life policy and investment contract reserves	$	2,497	$	2,390

Deferred_Policy_Acquisition_Co

Deferred Policy Acquisition Costs	12 Months Ended
	Dec. 31, 2014
Deferred Costs [Abstract]
Deferred Policy Acquisition Costs	Deferred Policy Acquisition Costs
	Expenses associated with successfully acquiring insurance policies – primarily commissions, premium taxes and underwriting costs – are deferred and amortized over the terms of the policies. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate the costs for recoverability. All acquisition costs reflect ASU 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts, which we retrospectively adopted on January 1, 2012.
	The table below shows the deferred policy acquisition costs and asset reconciliation:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Deferred policy acquisition costs asset, January 1	$	565		$	470		$	477
	Capitalized deferred policy acquisition costs	827			802			734
	Amortized deferred policy acquisition costs	(807		)	(758		)	(706		)
	Amortized shadow deferred policy acquisition costs	(7		)	51			(35		)
	Deferred policy acquisition costs asset, December 31	$	578		$	565		$	470
	The change in amortized shadow deferred policy acquisition costs in 2013 compared with 2014 and 2012 was the result of rising interest rates. No premium deficiencies were recorded in the consolidated statements of income in 2014, 2013 and 2012, as the sum of the anticipated loss and loss adjustment expenses, policyholder dividends and unamortized deferred acquisition expenses did not exceed the related unearned premiums and anticipated investment income.

Note_Payable

Note Payable	12 Months Ended
	Dec. 31, 2014
Notes Payable, Current [Abstract]
Note Payable	Note Payable
	We have one line of credit in 2014 and 2013 through multiple commercial banks with a borrowing capacity of
	$225 million and an additional $50 million accordion feature. Our unsecured revolving credit facility has a term of five years that expires May 13, 2019. We had no compensating balance requirements on short-term debt for either 2014 or 2013. At December 31, 2014, $49 million was drawn on the line of credit. At December 31, 2013,
	$104 million was drawn on the line of credit. The interest rate charged on our borrowings on this credit agreement ranged from 1.15 percent to 1.30 percent during 2014 and ranged from 1.30 percent to 1.35 percent during 2013.

LongTerm_Debt_And_Capital_Leas

Long-Term Debt And Capital Lease Obligation	12 Months Ended
	Dec. 31, 2014
Long-term Debt and Capital Lease Obligations [Abstract]
Long-Term Debt And Capital Lease Obligation	Long-Term Debt and Capital Lease Obligations
	This table summarizes the principal amounts of our long-term debt excluding unamortized discounts, none of which are encumbered by rating triggers:
	(Dollars in millions)					Book value						Principal amount
	Interest rate		Year of			December 31,			December 31,			December 31,			December 31,
			issue			2014			2013			2014			2013
	6.90%		1998	Senior debentures, due 2028		$	28		$	28		$	28		$	28
	6.92%		2005	Senior debentures, due 2028		391			391			391			391
	6.13%		2004	Senior notes, due 2034		372			371			374			374
				Total		$	791		$	790		$	793		$	793
	Capital lease obligations, excluding an insignificant amount of interest, totaled $36 million and $45 million in 2014 and 2013, respectively. Below are the expected capital lease obligations that we expect to pay over the next six years:
	(Dollars in millions)	Years ended December 31,
		2015			2016			2017			2018			2019			2020
	Capital lease obligations	$	18		$	9		$	3		$	2		$	3		$	1

Shareholders_Equity_And_Divide

Shareholders' Equity And Dividend Restrictions	12 Months Ended
	Dec. 31, 2014
Shareholders Equity And Dividend Restrictions [Abstract]
Shareholders' Equity And Dividend Restrictions	Shareholders’ Equity and Dividend Restrictions
	Declared cash dividends per share were $1.76, $1.655 and $1.62 for the years ended December 31, 2014, 2013 and 2012, respectively.
	Our insurance subsidiary declared dividends to the parent company of $400 million in 2014, $375 million in 2013 and $300 million in 2012. State regulatory requirements restrict the dividends insurance subsidiaries can pay. Dividends must be paid within 30 days of declaration. Generally, the most our insurance subsidiary can pay without prior regulatory approval is the greater of 10 percent of statutory capital and surplus or 100 percent of statutory net income for the prior calendar year. Dividends exceeding these limitations may be paid only with approval of the insurance department of the domiciliary state. During 2015, the total that our insurance subsidiary, which is the parent of all other insurance subsidiaries, may declare in dividends is approximately $447 million.
	Accumulated Other Comprehensive Income
	The table below shows beginning and end of year accumulated other comprehensive income or loss for investments, pension obligations, life deferred acquisition costs, life policy reserves and other. The changes from the beginning of year to the end of year are the result of changes to other comprehensive income or loss (OCI).
	(Dollars in millions)	2014									2013									2012
		Before			Income			Net			Before			Income			Net			Before			Income			Net
		tax			tax						tax			tax						tax			tax
	Investments:
	AOCI, January 1	$	2,335		$	808		$	1,527		$	1,875		$	647		$	1,228		$	1,489		$	512		$	977
	OCI before realized gains recognized in net income	514			181			333			537			188			349			426			149			277
	Realized gains recognized in net income	(130		)	(47		)	(83		)	(77		)	(27		)	(50		)	(40		)	(14		)	(26		)
	OCI	384			134			250			460			161			299			386			135			251
	AOCI, December 31	$	2,719		$	942		$	1,777		$	2,335		$	808		$	1,527		$	1,875		$	647		$	1,228
	Pension Obligations:
	AOCI, January 1	$	(18	)	$	(6	)	$	(12	)	$	(101	)	$	(35	)	$	(66	)	$	(88	)	$	(31	)	$	(57	)
	OCI before realized losses recognized in net income	(21		)	(7		)	(14		)	83			29			54			(13		)	(4		)	(9		)
	Realized losses recognized in net income	3			1			2			—			—			—			—			—			—
	OCI	(18		)	(6		)	(12		)	83			29			54			(13		)	(4		)	(9		)
	AOCI, December 31	$	(36	)	$	(12	)	$	(24	)	$	(18	)	$	(6	)	$	(12	)	$	(101	)	$	(35	)	$	(66	)
	Life deferred acquisition costs, life policy reserves and other:
	AOCI, January 1	$	(16	)	$	(5	)	$	(11	)	$	(50	)	$	(17	)	$	(33	)	$	(29	)	$	(10	)	$	(19	)
	OCI before realized gains recognized in net income	7			3			4			40			14			26			(19		)	(7		)	(12		)
	Realized gains recognized in net income	(3		)	(1		)	(2		)	(6		)	(2		)	(4		)	(2		)	—			(2		)
	OCI	4			2			2			34			12			22			(21		)	(7		)	(14		)
	AOCI, December 31	$	(12	)	$	(3	)	$	(9	)	$	(16	)	$	(5	)	$	(11	)	$	(50	)	$	(17	)	$	(33	)
	Summary of AOCI:
	AOCI, January 1	$	2,301		$	797		$	1,504		$	1,724		$	595		$	1,129		$	1,372		$	471		$	901
	Investments OCI	384			134			250			460			161			299			386			135			251
	Pension obligations OCI	(18		)	(6		)	(12		)	83			29			54			(13		)	(4		)	(9		)
	Life deferred acquisition costs, life policy reserves and other OCI	4			2			2			34			12			22			(21		)	(7		)	(14		)
	Total OCI	370			130			240			577			202			375			352			124			228
	AOCI, December 31	$	2,671		$	927		$	1,744		$	2,301		$	797		$	1,504		$	1,724		$	595		$	1,129

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2014
Reinsurance Disclosures [Abstract]
Reinsurance	Reinsurance
	Reinsurance mitigates the risk of highly uncertain exposures and reduces the maximum net loss that can arise from large risks or risks concentrated in areas of exposure. Management’s decisions about the appropriate level of risk retention are affected by various factors, including changes in our underwriting practices, capacity to retain risks and reinsurance market conditions.
	Primary components of our property and casualty reinsurance program include a property per risk treaty, property excess treaty, casualty per occurrence treaty, casualty excess treaty, property catastrophe treaty and catastrophe bonds.
	Our consolidated statements of income include earned consolidated property casualty insurance premiums on assumed and ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct earned premiums	$	4,209		$	3,903		$	3,520
	Assumed earned premiums	12			11			9
	Ceded earned premiums	(176		)	(201		)	(185		)
	Earned premiums	$	4,045		$	3,713		$	3,344
	Our consolidated statements of income include incurred consolidated property casualty insurance loss and loss expenses on assumed and ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct incurred loss and loss expenses	$	2,661		$	2,323		$	2,235
	Assumed incurred loss and loss expenses	6			11			6
	Ceded incurred loss and loss expenses	(40		)	(33		)	(104		)
	Incurred loss and loss expenses	$	2,627		$	2,301		$	2,137
	Our ceded incurred results generally vary with our catastrophe experience.
	Our life insurance company purchases reinsurance for protection of a portion of the risk that is written. Primary components of our life reinsurance program include individual mortality coverage, aggregate catastrophe and accidental death coverage in excess of certain deductibles.
	Our consolidated statements of income include earned life insurance premiums on ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct earned premiums	$	259		$	248		$	235
	Ceded earned premiums	(61		)	(59		)	(57		)
	Earned premiums	$	198		$	189		$	178
	Our consolidated statements of income include life insurance contract holders’ benefits incurred on ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct contract holders' benefits incurred	$	299		$	266		$	232
	Ceded contract holders' benefits incurred	(70		)	(62		)	(47		)
	Contract holders' benefits incurred	$	229		$	204		$	185
	The ceded benefits incurred can vary depending on the type of life insurance policy held and the year the policy was issued.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	The significant components of deferred tax assets and liabilities included in the consolidated balance sheets at December 31 were as follows:
	(Dollars in millions)	At December 31,
		2014			2013
	Deferred tax assets:
	Loss and loss expense reserves	$	197		$	206
	Unearned premiums	145			137
	Investments	16			19
	Other	41			46
	Total	399			408
	Deferred tax liabilities:
	Unrealized investment gains, net	937			807
	Deferred acquisition costs	183			178
	Life policy reserves	110			86
	Other	9			10
	Total	1,239			1,081
	Net deferred income tax liability	$	840		$	673
	Deferred tax assets and liabilities reflect temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amount recognized for tax purposes.
	The differences between the 35 percent statutory federal income tax rate and our effective income tax rate were as follows:
	(Dollars in millions)	Years ended December 31,
		2014					2013					2012
	Tax at statutory rate:	$	252		35	%	$	250		35	%	$	198		35	%
	Increase (decrease) resulting from:
	Tax-exempt income from municipal bonds	(33		)	(4.6	)	(32		)	(4.5	)	(33		)	(5.9	)
	Dividend received exclusion	(29		)	(4.0	)	(26		)	(3.6	)	(24		)	(4.2	)
	Other	6			0.8		5			0.7		4			0.7
	Provision for income taxes	$	196		27.2	%	$	197		27.6	%	$	145		25.6	%
	The provision for federal income taxes is based upon filing a consolidated income tax return for the company and its subsidiaries. As of December 31, 2014 and 2013, we had no operating or capital loss carry forwards.
	Unrecognized Tax Benefits
	As a result of positions either taken in our 2011 through 2013 federal tax returns filed with the IRS or expected to be taken in the 2014 filing, we believe it is more likely than not that our tax liability will be sustained upon examination by the IRS. We therefore carry no amount for unrecognized tax benefits for the years ended 2011 through 2014.
	The statute of limitations for federal tax purposes have closed for tax years 2008 and earlier. Although all issues for tax years 2009 and 2010 have been settled and agreed to, the statute of limitations for these two tax years remains open until December 31, 2015. Our recent settlement with the IRS of tax years 2009 and 2010 resulted in no material changes to the returns as filed.
	Income taxes paid in our consolidated statements of cash flows are shown net of refunds received of less than
	$1 million in both 2014 and 2013 and $11 million in 2012.
	In addition to our IRS filings, we file income tax returns with immaterial amounts in various state jurisdictions. The statute of limitations for state income tax purposes has closed for tax years 2009 and earlier.

Net_Income_Per_Common_Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Income Per Common Share	Net Income Per Common Share
	Basic earnings per share are computed based on the weighted average number of common shares outstanding. Diluted earnings per share are computed based on the weighted average number of common and dilutive potential common shares outstanding using the treasury stock method. The table shows calculations for basic and diluted earnings per share:
	(In millions except per share data)	Years ended December 31,
		2014		2013		2012
	Numerator:
	Net income—basic and diluted	$	525	$	517	$	421
	Denominator:
	Basic weighted-average common shares outstanding	163.5		163.5		162.5
	Effect of stock-based awards:
	Stock options	1		1.2		0.5
	Nonvested shares	0.6		0.7		0.7
	Diluted weighted-average shares	165.1		165.4		163.7
	Earnings per share:
	Basic	$	3.21	$	3.16	$	2.59
	Diluted	3.18		3.12		2.57
	Number of anti-dilutive stock-based awards	0.7		0.4		5.9
	The current sources of dilution of our common shares are certain equity-based awards as discussed in Note 17, Share-Based Associate Compensation Plans. The above table includes the number of anti-dilutive stock-based awards at year-end 2014, 2013 and 2012. We did not include these stock-based awards in the computation of net income per common share (diluted) because their exercise would have anti-dilutive effects.

Employee_Retirement_Benefits

Employee Retirement Benefits	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Retirement Benefits	Employee Retirement Benefits
	We sponsor a qualified defined benefit pension plan. During 2008, we changed the form of retirement benefit we offer some associates to a company match on contributions to a 401(k) plan from the defined benefit pension plan. We closed entry into the pension plan for new associates as of June 30, 2008, and only participants 40 years of age or older as of August 31, 2008, could elect to continue to participate. For participants remaining in the pension plan, we continue to contribute to fund future benefit obligations. Benefits for the defined benefit pension plan are based on years of credited service and compensation level. Contributions are based on the prescribed method defined in the Pension Protection Act. Our pension expense is based on certain actuarial assumptions and also is composed of several components that are determined using the projected unit credit actuarial cost method. The qualified plan has been amended to allow for distribution of vested balances to terminated participants.
	We also sponsor a defined contribution plan (401(k) plan). Matching company contributions totaled $11 million,
	$10 million and $9 million during the years 2014, 2013 and 2012, respectively. Associates who are not accruing benefits under the pension plan are eligible to receive the company match of up to 6 percent of cash compensation. We also pay all operating expenses for the 401(k) plan. Participants vest in the company match for the 401(k) plan after three years of eligible service.
	We maintain a supplemental executive retirement plan (SERP) with a benefit obligation of $13 million at
	year-end 2014 and $9 million at year-end 2013, which is included in the projected benefit obligation. The company also makes available to a select group of associates the CFC Top Hat Savings Plan, a nonqualified deferred compensation plan, which had a fair value of $18 million and $14 million at December 31, 2014 and 2013, respectively.
	Defined Benefit Pension Plan Assumptions
	We evaluate our pension plan assumptions annually and update them as necessary. This is a summary of the weighted-average assumptions used to determine our benefit obligations at December 31 for the plans:
		Qualified Pension Plan						SERP
		2014			2013			2014			2013
	Discount rate	4.25	%		5.15	%		4.05	%		4.8	%
	Rate of compensation increase	2.75-3.25			2.75-3.25			2.75-3.25			2.75-3.25
	To determine the discount rate for each plan, a theoretical settlement portfolio of high quality rated corporate bonds was chosen to provide payments approximately matching the plan’s projected benefit payments. A single interest rate for each plan was determined resulting in a discounted value of the plan's benefit payments that equates to the market value of the selected bonds. The discount rate is reflective of current market interest rate conditions and our plan's liability characteristics. Based on this analysis, we decreased the rate from the prior year by 0.90 percentage points for the qualified pension plan and by 0.75 percentage points for the SERP. Compensation increase assumptions reflect anticipated rates of inflation, real return on wage growth and merit and promotional increases. The mortality assumption was updated in 2014 to the RP-2014 Employee Mortality Tables and RP-2014 Annuitant Mortality Tables for males and females projected generationally with Scale MP-2014. The updated mortality table did not have a significant impact on our financial statements as our qualified plan assumes benefits will be paid in the form of lump sums.
	This is a summary of the weighted-average assumptions used to determine our net expense for the plans:
		Qualified Pension Plan									SERP
		2014			2013			2012			2014		2013		2012
	Discount rate	5.15	%		4.2	%		5.1	%		4.8	%	3.95	%	4.75	%
	Expected return on plan assets	7.25			7.5			7.5			n/a		n/a		n/a
	Rate of compensation increase	2.75-3.25			2.75-3.25			3.50-5.50			2.75-3.25		2.75-3.25		3.50-5.50
	The discount rate was increased by 0.95 percentage points for the qualified pension plan and 0.85 percentage points for the SERP due to market interest rate conditions in 2014. The discount rate assumptions for our benefit obligation generally track with high quality rated corporate bond yields chosen in our theoretical settlement portfolio, and yearly adjustments reflect any changes to those bond yields. We believe the expected return on plan assets is representative of the expected long-term rate of return on these assets, which is consistent with 2014 expectations of interest rates and based partially on the fact that the plan’s common stock holdings pay dividends. We believe this rate is representative of the expected long-term rate of return on these plan assets. We review historical actual return on plan assets when determining our expected long-term rate of return. Total portfolio return for 2014 was 11.7 percent and for 2013 was 24.0 percent. Our compensation increase assumptions in 2014 reflect anticipated rates of inflation, real return on wage growth and merit and promotional increases.
	Benefit obligation activity using an actuarial measurement date for our qualified plan and SERP at December 31 follows:
	(Dollars in millions)	At December 31,
		2014				2013
	Change in projected benefit obligation:
	Benefit obligation, January 1	$	284			$	320
	Service cost	10				13
	Interest cost	15				13
	Actuarial loss (gain)	35				(34		)
	Benefits paid	(27		)		(28		)
	Other	2				—
	Projected benefit obligation, December 31	$	319			$	284
	Accumulated benefit obligation	$	284			$	257
	Change in plan assets:
	Fair value of plan assets, January 1	$	280			$	238
	Actual return on plan assets	30				55
	Employer contribution	5				15
	Benefits paid	(27		)		(28		)
	Fair value of plan assets, December 31	$	288			$	280
	Funded status, December 31	$	(31	)		$	(4	)
	The decreases in discount rate and lump sum rate resulted in an increase in actuarial loss and projected benefit obligation from 2013 and an increase in unfunded status.
	A reconciliation follows of the funded status for our qualified plan and SERP at the end of the measurement period to the amounts recognized in the consolidated balance sheets at December 31:
	(Dollars in millions)	At December 31,
		2014				2013
	Pension amounts recognized in the consolidated balance sheets:
	Other assets	$	—			$	4
	Other liabilities	(31		)		(8		)
	Net amount recognized	$	(31	)		$	(4	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss	$	34			$	18
	Prior service cost	2				—
	Total	$	36			$	18
	The change in the amount recognized in other comprehensive income is largely due to the decrease in discount rate and corresponding decreases in assumed lump sum rates.
	Below are the components of our net periodic benefit cost, as well as other changes in plan assets and benefit obligations recognized in other comprehensive income for our qualified plan and SERP at December 31:
	(Dollars in millions)	Years ended December 31,
		2014				2013				2012
	Net periodic benefit cost:
	Service cost	$	10			$	13			$	12
	Interest cost	15				13				14
	Expected return on plan assets	(17		)		(17		)		(16		)
	Amortization of actuarial loss and prior service cost	2				9				8
	Other	3				2				—
	Net periodic benefit cost	$	13			$	20			$	18
	(Dollars in millions)	Years ended December 31,
		2014				2013				2012
Other changes in plan assets and benefit obligations recognized in
other comprehensive income:
Current year actuarial loss (gain)	$	21			$	(72	)		$	20
Amortization of actuarial loss	(5		)		(10		)		(6		)
Current year prior service cost	2				—				—
Amortization of prior service cost	—				(1		)		(1		)
Total recognized in other comprehensive loss (income)	$	18			$	(83	)		$	13
The total recognized in net periodic benefit cost and other comprehensive income was a net cost of $31 million, net benefit of $63 million, and a net cost of $31 million for the years ended December 31, 2014, 2013 and 2012, respectively. The change in the amount recognized in other comprehensive income from 2013 is largely due to decreases in discount and lump sum rates, partially offset with greater than anticipated return on plan assets. The estimated costs to be amortized from AOCI into net periodic benefit cost over the next year for our plans are
$5 million in actuarial loss and $1 million in prior service cost.
Defined Benefit Pension Plan Assets
The pension plan assets are managed to maximize total return over the long term while providing sufficient liquidity and current return to satisfy the cash flow requirements of the plan. The plan’s day-to-day investment decisions are managed by our internal investment department; however, overall investment strategies are discussed with our employee benefits committee. Our investment strategy, currently driven by the low interest rate environment, is to weight our portfolio towards large cap, high quality, dividend growing equities that we have historically favored. As our plan matures and interest rates normalize, we expect a greater allocation to fixed income securities to better align asset and liability market risks. Our fixed-maturity bond portfolio is investment grade. The plan does not engage in derivative transactions.
Excluding cash, during 2014 we held approximately 81 percent of our pension portfolio in domestic common equity investments, which reflect the long-term time horizon of pension obligations. The remainder of the portfolio consisted of 12 percent in states, municipalities and taxable political subdivisions fixed-maturity investments and 7 percent in domestic corporate fixed-maturity investments. Our common equity portfolio consisted of 23 percent in the financial sector, 19 percent in the information technology sector, 14 percent in the healthcare sector and 12 percent in the industrial sector at year-end 2014. No additional sectors accounted for 10 percent or more of our common equity portfolio balance at year-end 2014. We had $11 million of cash on hand at December 31, 2014, to cover retirements.
Investments in securities are valued based on the fair value hierarchy outlined in Note 3, Fair Value Measurements. The pension plan did not have any liabilities carried at fair value during the years ended December 31, 2014 and 2013. There have been no transfers between Level 1 and Level 2 for the years ended December 31, 2014 and 2013. The following table shows the fair value hierarchy for those assets measured at fair value on a recurring basis at December 31, 2014 and 2013. Excluded from the table below is cash on hand of $11 million and $19 million at December 31, 2014 and 2013.
(Dollars in millions)	Quoted prices in				Significant other				Significant			Total
	active markets for				observable inputs (Level 2)				unobservable
	identical assets (Level 1)								inputs
At December 31, 2014									(Level 3)
Fixed maturities, available for sale:
States, municipalities and political subdivisions	$	—			$	33			$	—		$	33
Corporate securities	—				19				—			19
Total fixed maturities, available for sale	—				52				—			52
Common equities, available for sale	225				—				—			225
Total	$	225			$	52			$	—		$	277
At December 31, 2013
Fixed maturities, available for sale:
States, municipalities and political subdivisions	$	—			$	32			$	—		$	32
Corporate securities	—				21				—			21
Total fixed maturities, available for sale	—				53				—			53
Common equities, available for sale	208				—				—			208
Total	$	208			$	53			$	—		$	261
Our pension plan assets included 467,113 shares of the company’s common stock at both December 31, 2014 and 2013, which had a fair value of $24 million at both December 31, 2014 and 2013. The defined benefit pension plan did not purchase any shares of our common stock during 2014 and 2013. No shares of our common stock were sold during 2014. During 2013, the pension plan sold 100,000 shares of the company’s common stock for a realized gain of $5 million. The company paid $1 million in cash dividends on our common stock to the pension plan in both 2014 and 2013.
We contributed $5 million to our qualified plan during the first quarter of 2015 and expect to pay out $3 million of benefit payments from the SERP during 2015. We expect to make the following benefit payments for our qualified plan and SERP, reflecting expected future service:
(Dollars in millions)	Years ended December 31,
	2015				2016				2017			2018			2019		2020 - 2024
Expected future benefit payments	$	26			$	32			$	29		$	23		$	24	$	142

Statutory_Accounting_Informati

Statutory Accounting Information	12 Months Ended
	Dec. 31, 2014
Staturory Accounting Information [Abstract]
Statutory Accounting Information	Statutory Accounting Information
	Insurance companies’ statutory financial statements are presented on the basis of accounting practices prescribed or permitted by applicable state insurance departments of domicile. Insurance companies use statutory accounting practices (SAP) as recognized by various states. We have adopted the National Association of Insurance Commissioners’ (NAIC) Accounting Practices and Procedures manual, version effective January 1, 2001, and updates through the current year as a component of prescribed or permitted practices by laws of the state of domicile. The primary differences between SAP and GAAP include the valuation of unrealized investment gains and losses, expensing of policy acquisition costs, actuarial assumptions for life insurance reserves and deferred income taxes based on differences in statutory and taxable income.
	Statutory net income (loss) and capital and surplus are determined in accordance with SAP prescribed or permitted by insurance regulatory authorities for five legal entities, our insurance subsidiary and its four insurance subsidiaries. Statutory capital and surplus for our insurance subsidiary, The Cincinnati Insurance Company, includes capital and surplus of its four insurance subsidiaries. All capital and surplus amounts exceed statutory risk-based capital requirements. The statutory net income (loss) and statutory capital and surplus are presented below:
	(Dollars in millions)	Net income (loss)								Capital and surplus
		Years ended December 31,								At December 31,
		2014			2013			2012		2014		2013
	The Cincinnati Insurance Company	$	436		$	418		$	334	$	4,472	$	4,326
	The Cincinnati Casualty Company	12			10			10		330		317
	The Cincinnati Indemnity Company	3			2			2		86		82
	The Cincinnati Specialty Underwriters Insurance Company	32			18			6		266		228
	The Cincinnati Life Insurance Company	(19		)	(20		)	5		223		247

Transactions_With_Affiliated_P

Transactions With Affiliated Parties	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Transactions With Affiliated Parties	Transactions With Affiliated Parties
	We paid certain officers and directors, or insurance agencies of which they are shareholders, commissions of
	$7 million in 2014, $6 million in 2013 and $5 million 2012, on premium volume of $41 million, $35 million and
	$35 million for 2014, 2013 and 2012, respectively.

Commitments_And_Contingent_Lia

Commitments And Contingent Liabilities	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingent Liabilities	Commitments and Contingent Liabilities
	In the ordinary course of conducting business, the company and its subsidiaries are involved in various legal proceedings, namely claims litigation. The company's insurance subsidiaries participate in most of these proceedings by either defending third-party claims brought against insureds or litigating first-party coverage claims. The company accounts for such activity through the establishment of unpaid loss and loss adjustment expense reserves. We believe that the ultimate liability, if any, with respect to such ordinary-course claims litigation, after consideration of provisions made for potential losses and costs of defense, is immaterial to our consolidated financial condition, results of operations and cash flows.
	The company and its subsidiaries also are occasionally involved in other legal and regulatory proceedings, some of which assert claims for substantial amounts. These actions include, among others, putative class actions seeking certification of a state or national class. Such proceedings have alleged, for example, breach of an alleged duty to search national data bases to ascertain unreported deaths of insureds under life insurance policies. The company’s insurance subsidiaries also are occasionally parties to individual actions in which extra-contractual damages, punitive damages or penalties are sought, such as claims alleging bad faith in the handling of insurance claims or claims alleging discrimination by former associates.
	On a quarterly basis, we review these outstanding matters. Under current accounting guidance, we establish accruals when it is probable that a loss has been incurred and we can reasonably estimate its potential exposure. The company accounts for such probable and estimable losses, if any, through the establishment of legal expense reserves. Based on our quarterly review, we believe that our accruals for probable and estimable losses are reasonable and that the amounts accrued do not have a material effect on our consolidated financial condition or results of operations. However, if any one or more of these matters results in a judgment against us or settlement for an amount that is significantly greater than the amount accrued, the resulting liability could have a material effect on the company’s consolidated results of operations or cash flows. Based on our most recent review, our estimate for any other matter for which the risk of loss is more than remote is less than $1 million.

ShareBased_Associate_Compensat

Share-Based Associate Compensation Plans	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Stock-Based Associate Compensation Plans	Share-Based Associate Compensation Plans
	Four equity compensation plans currently permit us to grant various types of equity awards. We currently grant incentive stock options, nonqualified stock options, service-based restricted stock units and performance-based restricted stock units to associates, including some with market-based performance objectives under our shareholder-approved plans. We also have a Holiday Stock Plan that permits annual awards of one share of common stock to each full-time associate for each full calendar year of service up to a maximum of 10 shares. One of our equity compensation plans permits us to grant stock to our outside directors as a component of their annual compensation. We used treasury shares for share-based compensation award issues or exercises during 2014.
	Share-based compensation cost after tax was $13 million, $12 million and $11 million for the years ended
	December 31, 2014, 2013 and 2012, respectively. The related income tax benefit recognized was $6 million,
	$6 million and $5 million for the years ended December 31, 2014, 2013 and 2012, respectively. Options exercised during the years ended December 31, 2014, 2013 and 2012, had intrinsic value of $13 million,
	$17 million, and $6 million, respectively. Intrinsic value is the market price less the exercise price. Options vested during the years ended December 31, 2014, 2013 and 2012, had total intrinsic value of $9 million, $15 million and $5 million, respectively.
	As of December 31, 2014, we had $21 million of unrecognized total compensation cost related to nonvested stock options and restricted stock unit awards. That cost will be recognized over a weighted-average period of 1.7 years.
	Stock Options
	Stock options are granted to associates at an exercise price equal to the fair value as determined by the average high and low sales price reported on the Nasdaq Global Select Market for the grant date and are exercisable over 10-year periods. The stock options generally vest ratably over a three-year period. In determining the share-based compensation amounts, we estimate the fair value of each option granted on the date of grant using a binomial option-pricing model. We make the following assumptions to develop the binomial option-pricing model as follows:
	•	Weighted-average expected term is based on historical experience of similar awards with consideration for current exercise trends.
	•	Expected volatility is based on our stock price over a historical period that approximates the expected term.
	•	Dividend yield is determined by dividing the annualized per share dividend by the stock price on the date of grant.
	•	Risk-free rates are the implied yield currently available on zero-coupon U.S. Treasury issues with a remaining term approximating the expected term.
	The following weighted average assumptions were used in determining fair value for option grants issued during 2014 and 2013:
			2014		2013		2012
	Weighted-average expected term		8-9 years		9-10 years		8-10 years
	Expected volatility		25.20-26.22%		25.25-26.31%		25.26-26.20%
	Dividend yield		3.76%		3.65%		4.51-4.52%
	Risk-free rates		2.42-2.62%		1.82-2.00%		1.58-2.00%
	Weighted-average fair value of options granted during the period		$10.16		$9.71		$6.78
	This is a summary of options information:
	(Dollars in millions, shares in thousands)		Shares			Weighted-				Aggregate
						average				intrinsic
						exercise price				value
	Outstanding shares at January 1, 2014		6,332			$	38.39
	Granted		401			46.81
	Exercised		(1,086	)		37.59
	Forfeited or expired		(689	)		39.49
	Outstanding shares at December 31, 2014		4,958			39.1				$	66
	Options exercisable at end of period		4,165			$	38.17			$	59
	Cash received from the exercise of options was $22 million, $25 million and $10 million for the years ended December 31, 2014, 2013 and 2012, respectively. We acquired 378,276, 577,745 and 311,524 shares totaling
	$19 million, $28 million and $12 million, respectively, from associates in consideration for option exercises during 2014, 2013 and 2012. The weighted-average remaining contractual life for options expected to vest as of December 31, 2014, was 8.4 years.
	Options outstanding and exercisable consisted of the following at December 31, 2014:
	(Shares in thousands)		Options outstanding									Options exercisable
	Range of exercise prices		Shares			Weighted-average		Weighted-				Shares			Weighted-
						remaining contractual		average							average
						life		exercise price							exercise price
	$25.00 to $29.99		731			4.58 years		$	26.58			731			$	26.58
	$30.00 to $34.99		675			6.01 years		33.96				675			33.96
	$35.00 to $39.99		981			4.90 years		37.31				824			37.63
	$40.00 to $44.99		1,258			3.09 years		43.58				1,015			43.32
	$45.00 to $49.99		1,313			3.50 years		45.73				920			45.26
	Total		4,958			4.17 years		39.1				4,165			38.17
	The weighted-average remaining contractual life for exercisable awards as of December 31, 2014, was 3.4 years. Under all active shareholder approved plans, a total of 17.3 million shares were authorized to be granted. At December 31, 2014, 6.2 million shares remained available for future issuance under the plans. During 2014, we granted 20,760 shares of common stock to our directors for 2013 board service fees.
	Restricted Stock Units
	Service-based restricted stock units granted to associates are valued at fair value of the shares on the date of grant less the present value of the dividends that holders of restricted stock units do not receive on the shares underlying the restricted stock units during the vesting period. Service-based restricted stock units cliff vest three years after the date of grant. Service-based restricted stock units vested during the year had an intrinsic value of $14 million, $15 million and less than $1 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	We have performance-based awards that vest on the first day of March after a three-calendar-year performance period. These awards vest according to the level of three-year total shareholder return achieved compared with a peer group over a three-year performance period with payouts ranging from 0 - 200 percent for awards granted in 2013 and 2014. For awards granted in 2012, the payout range on these performance awards is 0 - 125 percent. Three-year total shareholder return is calculated by Bloomberg, using annualized total return of a stock to an investor due to capital gain appreciation plus reinvestment of all dividends. We issued 59,615 shares of performance-based restricted stock units during 2014 at the maximum-level performance hurdle for the three-year performance period ended December 31, 2013, as we achieved a three-year total shareholder return that exceeded all seven of the companies in our 2011 peer group. For the three-year performance period ended December 31, 2014, our total shareholder return exceeded six of 10 peers in our 2012 peer group. We expect payout of these shares at the target level to occur in March of 2015. Performance-based awards vested during the year had an intrinsic value of $3 million, $3 million and $2 million for the years ended December 31, 2014, 2013 and 2012, respectively.
	These performance-based awards are valued using a Monte-Carlo valuation on the date of grant, which uses a risk‑neutral framework to model future stock price movements based upon the risk-free rate of return, the volatility of each peer and the pairwise correlations of each peer being modeled. Compensation cost is recognized regardless of whether the market-based performance objective has been satisfied. We make assumptions to develop the Monte-Carlo model as follows:
	•	Correlation coefficients are based upon the price data used to calculate the historical volatilities. The correlation coefficients are used to model the way each entity tends to move in relation to each other.
	•	Expected volatility is based on our stock price over a historical period that approximates the remainder of the performance period. We have used the historical volatilities of 2.88 percent for 2014 grants and 2.87 percent for 2013 grants.
	•	Dividend yield has been modeled assuming dividends are reinvested in the issuing entity on a continuous basis and the holder of the award is not entitled to receive dividends paid during the performance period. Dividend yields of 3.74 percent for 2014 grants and 3.63 percent for 2013 grants were used.
	•	Risk-free rates are equal to the yield, as of the measurement date, of the zero-coupon U.S. Treasury bill that is commensurate with the performance measurement period. Risk-free rates used were 0.66 percent for 2014 and 0.40 percent for 2013 grants.
	This is a summary of service-based and performance-based share information, assuming a target payout for performance-based shares, for the year 2014:
	(Shares in thousands)		Service-based			Weighted-				Performance-based			Weighted-
			shares			average grant				shares			average grant
						date fair value							date fair value
	Nonvested at January 1, 2014		936			$	33.61			246			$	37.66
	Granted		331			41.84				99			36.03
	Vested		(271	)		29.79				(60	)		30.91
	Forfeited or canceled		(28	)		36.28				(2	)		31.77
	Nonvested at December 31, 2014		968			37.42				283			38.55

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	Segment Information
	We operate primarily in two industries, property casualty insurance and life insurance. We regularly review our reporting segments to make decisions about allocating resources and assessing performance. Our reporting segments are:
	•	Commercial lines insurance
	•	Personal lines insurance
	•	Excess and surplus lines insurance
	•	Life insurance
	•	Investments
	We report as Other the noninvestment operations of the parent company and its noninsurer subsidiary, CFC Investment Company.
	Revenues come primarily from unaffiliated customers:
	•	All four insurance segments record revenues from insurance premiums earned. Life insurance segment revenues also include separate account investment management fees.
	•	Fee revenues for the commercial and personal insurance segments primarily represent installment fees. Fee revenues for the life insurance segment represent separate account investment management fees.
	•	Our investments’ revenues consist of pretax net investment income and realized investment gains and losses.
	•	Other revenues are primarily finance income.
	Income or loss before income taxes for each segment is reported based on the nature of that business area’s operations:
	•	Income before income taxes for the insurance segments is defined as underwriting profit or loss.
	◦	For commercial lines, personal lines and excess and surplus lines insurance segments, we calculate underwriting profit or loss as premiums earned and fee revenue minus loss and loss expenses and underwriting expenses incurred.
	◦	For the life insurance segment, we calculate underwriting profit or loss as premiums earned and separate account investment management fees, minus contract holders’ benefits and expenses incurred, plus investment interest credited to contract holders.
	•	Income before income taxes for the investments segment is net investment income plus realized investment gains and losses for investments of the entire company, minus investment interest credited to contract holders of the life insurance segment.
	•	Loss before income taxes for the Other category is primarily due to interest expense from debt of the parent company and operating expenses of our headquarters.
	Identifiable assets are used by each segment in its operations. We do not separately report the identifiable assets for the commercial, personal or excess and surplus lines segments because we do not use that measure to analyze the segments. We include all investment assets, regardless of ownership, in the investments segment.
	This table summarizes segment information:
	(Dollars in millions)		Years ended December 31,
			2014			2013			2012
	Revenues:
	Commercial lines insurance
	Commercial casualty		$	938		$	856		$	767
	Commercial property		728			623			545
	Commercial auto		528			479			426
	Workers' compensation		370			365			344
	Other commercial lines		292			313			301
	Commercial lines insurance premiums		2,856			2,636			2,383
	Fee revenues		4			3			4
	Total commercial lines insurance		2,860			2,639			2,387
	Personal lines insurance
	Personal auto		476			443			404
	Homeowner		443			403			353
	Other personal lines		122			115			111
	Personal lines insurance premiums		1,041			961			868
	Fee revenues		2			1			2
	Total personal lines insurance		1,043			962			870
	Excess and surplus lines insurance		148			116			93
	Life insurance premiums		198			189			178
	Separate account investment management fees		6			4			1
	Total life insurance		204			193			179
	Investments
	Investment income, net of expenses		549			529			531
	Realized investment gains, net		133			83			42
	Total investment revenue		682			612			573
	Other		8			9			9
	Total revenues		$	4,945		$	4,531		$	4,111
	Income (loss) before income taxes:
	Insurance underwriting results:
	Commercial lines insurance		$	146		$	186		$	181
	Personal lines insurance		10			33			(43		)
	Excess and surplus lines insurance		30			14			(1		)
	Life insurance		(5		)	9			(3		)
	Investments		599			532			491
	Other		(59		)	(60		)	(59		)
	Total income before income taxes		$	721		$	714		$	566
			December 31,			December 31,
	Identifiable assets:		2014			2013
	Property casualty insurance		$	2,656		$	2,455
	Life insurance		1,316			1,225
	Investments		14,441			13,618
Other		340			364
Total		$	18,753		$	17,662

Quarterly_Supplementary_Data

Quarterly Supplementary Data	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Quarterly Supplementary Data	Quarterly Supplementary Data
	This table includes unaudited quarterly financial information for the years ended December 31, 2014 and 2013:
	(Dollars in millions except per share data)	Quarter
		1st		2nd		3rd		4th		Full year
	2014
	Revenues	$	1,189	$	1,214	$	1,280	$	1,262	$	4,945
	Income before income taxes	119		107		259		236		721
	Net income	91		84		183		167		525
	Net income per common share—basic	0.56		0.51		1.12		1.03		3.21
	Net income per common share—diluted	0.55		0.51		1.11		1.02		3.18
	2013
	Revenues	$	1,103	$	1,104	$	1,152	$	1,172	$	4,531
	Income before income taxes	217		148		182		167		714
	Net income	154		110		131		122		517
	Net income per common share—basic	0.95		0.67		0.8		0.75		3.16
	Net income per common share—diluted	0.94		0.66		0.79		0.74		3.12
	Note: The sum of the quarterly reported per share amounts may not equal the full year as each is computed independently. Revenues including realized investment gains and losses, which are integral to our financial results over the long term, may cause this value to fluctuate substantially because we have substantial discretion in the timing of investment sales. Also, applicable accounting standards require us to recognize gains and losses from certain changes in fair values of securities and embedded derivatives without actual realization of those gains and losses.

Summary_Of_Investments_Other_T

Summary Of Investments Other Than Investments In Related Parties	12 Months Ended
	Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties [Abstract]
Summary Of Investments Other Than Investments In Related Parties	Schedule I
	Cincinnati Financial Corporation and Subsidiaries
	Summary of Investments - Other Than Investments in Related Parties
	(Dollars in millions)	At December 31, 2014
	Type of investment	Cost or		Fair		Balance sheet
		amortized cost		value
	Fixed maturities:
	States, municipalities and political subdivisions:
	The Cincinnati Insurance Company	$	2,634	$	2,759	$	2,759
	The Cincinnati Casualty Company	136		143		143
	The Cincinnati Indemnity Company	39		41		41
	The Cincinnati Life Insurance Company	187		213		213
	The Cincinnati Specialty Underwriters Insurance Company	270		286		286
	CSU Producer Resources Inc.	1		1		1
	Total	3,267		3,443		3,443
	Convertibles and bonds with warrants attached:
	The Cincinnati Insurance Company	7		7		7
	Total	7		7		7
	United States government:
	The Cincinnati Insurance Company	1		1		1
	The Cincinnati Casualty Company	2		2		2
	The Cincinnati Indemnity Company	1		1		1
	The Cincinnati Life Insurance Company	3		3		3
	Total	7		7		7
	Government-sponsored enterprises:
	The Cincinnati Life Insurance Company	209		204		204
	The Cincinnati Insurance Company	4		4		4
	Total	213		208		208
	Foreign government:
	The Cincinnati Insurance Company	10		10		10
	Total	10		10		10
	All other corporate bonds:
	The Cincinnati Insurance Company	2,507		2,706		2,706
	The Cincinnati Casualty Company	110		118		118
	The Cincinnati Indemnity Company	21		23		23
	The Cincinnati Specialty Underwriters Insurance Company	151		159		159
	The Cincinnati Life Insurance Company	2,517		2,706		2,706
	CSU Producer Resources Inc.	4		4		4
	Cincinnati Financial Corporation	57		69		69
	Total	5,367		5,785		5,785
	Total fixed maturities	$	8,871	$	9,460	$	9,460
	Schedule I (continued)
	Cincinnati Financial Corporation and Subsidiaries
	Summary of Investments - Other Than Investments in Related Parties
	(Dollars in millions)	At December 31, 2014
	Type of investment	Cost or		Fair		Balance sheet
		amortized cost		value
	Equity securities:
	Common equities:
	The Cincinnati Insurance Company	$	1,462	$	2,831	$	2,831
	The Cincinnati Casualty Company	45		91		91
	The Cincinnati Indemnity Company	12		22		22
	The Cincinnati Specialty Underwriters Insurance Company	51		85		85
	CSU Producer Resources Inc.	9		11		11
	Cincinnati Financial Corporation	1,004		1,639		1,639
	Total	2,583		4,679		4,679
	Nonredeemable preferred equities:
	The Cincinnati Insurance Company	137		167		167
	The Cincinnati Life Insurance Company	5		8		8
	Cincinnati Financial Corporation	3		4		4
	Total	145		179		179
	Total equity securities	$	2,728	$	4,858	$	4,858
	Other invested assets:
	Policy loans:
The Cincinnati Life Insurance Company	$	31	—		$	31
Private equity:
Cincinnati Financial Corporation	37		—		37
Total other invested assets	$	68	—		$	68
Total investments	$	11,667	—		$	14,386

Condensed_Financial_Statements

Condensed Financial Statements Of Parent Company	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Condensed Financial Statements Of Parent Company	Schedule II
	Cincinnati Financial Corporation (parent company only)
	Condensed Balance Sheets
	(Dollars in millions)	At December 31,
		2014			2013
	Assets
	Investments
	Fixed maturities, at fair value	$	69		$	75
	Equity securities, at fair value	1,643			1,366
	Other invested assets	37			32
	Total investments	1,749			1,473
	Cash and cash equivalents	72			91
	Equity in net assets of subsidiaries	5,627			5,351
	Investment income receivable	6			5
	Land, building and equipment, net, for company use (accumulated depreciation:	144			148
	2014—$112; 2013—$106)
	Prepaid income tax	—			2
	Other assets	23			24
	Due from subsidiaries	107			114
	Total assets	$	7,728		$	7,208
	Liabilities
	Dividends declared but unpaid	$	72		$	68
	Deferred federal income tax	216			185
	Long-term debt	791			790
	Other liabilities	76			95
	Total liabilities	1,155			1,138
	Shareholders' Equity
	Common stock	397			397
	Paid-in capital	1,214			1,191
	Retained earnings	4,505			4,268
	Accumulated other comprehensive income	1,744			1,504
	Treasury stock at cost	(1,287		)	(1,290		)
	Total shareholders' equity	6,573			6,070
	Total liabilities and shareholders' equity	$	7,728		$	7,208
	This condensed financial information should be read in conjunction with the Consolidated Financial Statements and Notes included in Part II, Item 8.
	Schedule II (continued)
	Cincinnati Financial Corporation (parent company only)
	Condensed Statements of Income
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Revenues
	Investment income, net of expenses	$	46		$	41		$	42
	Realized investment gains, net	34			21			34
	Other revenue	16			15			15
	Total revenues	96			77			91
	Expenses
	Interest expense	52			53			53
	Other expenses	28			29			27
	Total expenses	80			82			80
	Income (Loss) Before Income Taxes and Earnings of Subsidiaries	16			(5		)	11
	Benefit for income taxes	(5		)	(11		)	(4		)
	Net Income Before Earnings of Subsidiaries	21			6			15
	Increase in equity of subsidiaries	504			511			406
	Net Income	$	525		$	517		$	421
	This condensed financial information should be read in conjunction with the Consolidated Financial Statements and Notes included in Part II, Item 8.
	Schedule II (continued)
	Cincinnati Financial Corporation (parent company only)
	Condensed Statements of Comprehensive Income
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Net Income	$	525		$	517		$	421
	Other Comprehensive Income, Before Tax
	Unrealized gains on investments available-for-sale	150			303			67
	Unrealized gains on investments held by subsidiaries	367			240			361
Reclassification adjustment for (gains) included in net income	(34		)	(21		)	(34		)
Reclassification adjustment for (gains) included in net income on subsidiaries	(99		)	(62		)	(8		)
Unrealized gains (losses) on other	7			(1		)	5
Unrealized (losses) gains on other subsidiaries	(3		)	35			(26		)
Unrealized gains on investments available-for-sale, investments held by subsidiaries and other	388			494			365
Amortization of pension actuarial (loss) gain and prior service cost	(18		)	83			(13		)
Other comprehensive income before tax	370			577			352
Income taxes on above of other comprehensive income	130			202			124
Other comprehensive income, net of tax	240			375			228
Comprehensive Income	$	765		$	892		$	649
This condensed financial information should be read in conjunction with the Consolidated Financial Statements and Notes included in Part II, Item 8.
Schedule II (continued)
Cincinnati Financial Corporation (parent company only)
Condensed Statements of Cash Flows
(Dollars in millions)	Years ended December 31,
	2014			2013			2012
Cash Flows From Operating Activities
Net income	$	525		$	517		$	421
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7			7			7
Realized investment gains, net	(34		)	(21		)	(34		)
Dividends from subsidiaries	400			378			300
Changes in:
Increase in equity of subsidiaries	(504		)	(511		)	(406		)
Investment income receivable	(1		)	(2		)	1
Current federal income taxes	3			12			(24		)
Deferred income tax	(6		)	(6		)	18
Other assets	20			(30		)	(2		)
Other liabilities	(14		)	39			7
Intercompany receivable for operations	22			(39		)	—
Net cash provided by operating activities	418			344			288
Cash Flows From Investing Activities
Sale of fixed maturities	—			—			114
Call or maturity of fixed maturities	4			23			13
Sale of equity securities	112			75			111
Purchase of fixed maturities	—			—			(1		)
Purchase of equity securities	(225		)	(179		)	(212		)
Investment in buildings and equipment, net	(2		)	(1		)	(1		)
Change in other invested assets, net	4			4			4
Return of capital from subsidiaries	—			22			—
Net cash (used) provided by investing activities	(107		)	(56		)	28
Cash Flows From Financing Activities
Payments on notes payable	(55		)	—			—
Payment of cash dividends to shareholders	(278		)	(263		)	(256		)
Purchase of treasury shares	(21		)	(52		)	—
Proceeds from stock options exercised	22			25			9
Net transfers to subsidiaries	—			—			(2		)
Other	2			3			3
Net cash used in financing activities	(330		)	(287		)	(246		)
Net change in cash and cash equivalents	(19		)	1			70
Cash and cash equivalents at beginning of year	91			90			20
Cash and cash equivalents at end of year	$	72		$	91		$	90
This condensed financial information should be read in conjunction with the Consolidated Financial Statements and Notes included in Part II, Item 8.

Supplementary_Insurance_Inform

Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2014
Supplementary Insurance Information [Abstract]
Supplementary Insurance Information	Schedule III
	Cincinnati Financial Corporation and Subsidiaries
	Supplementary Insurance Information
	(Dollars in millions)	Years ended December 31,
		2014		2013		2012
	Deferred policy acquisition costs:
	Commercial lines insurance	$	257	$	251	$	235
	Personal lines insurance	108		104		93
	Excess and surplus lines insurance	14		11		9
	Total property casualty insurance	379		366		337
	Life insurance	199		199		133
	Total	$	578	$	565	$	470
	Gross future policy benefits, losses, claims and expense losses:
	Commercial lines insurance	$	3,797	$	3,667	$	3,645
	Personal lines insurance	439		417		398
	Excess and surplus lines insurance	202		157		126
	Total property casualty insurance	4,438		4,241		4,169
	Life insurance	2,519		2,441		2,341
	Total (1)	$	6,957	$	6,682	$	6,510
	Gross unearned premiums:
	Commercial lines insurance	$	1,441	$	1,372	$	1,246
	Personal lines insurance	562		535		490
	Excess and surplus lines insurance	78		67		54
	Total property casualty insurance	2,081		1,974		1,790
	Life insurance	1		2		2
	Total (1)	$	2,082	$	1,976	$	1,792
	Other policy claims and benefits payable:
	Commercial lines insurance	$	—	$	—	$	—
	Personal lines insurance	—		—		—
	Excess and surplus lines insurance	—		—		—
	Total property casualty insurance	—		—		—
	Life insurance	25		19		15
	Total (1)	$	25	$	19	$	15
	Earned premiums:
	Commercial lines insurance	$	2,856	$	2,636	$	2,383
	Personal lines insurance	1,041		961		868
	Excess and surplus lines insurance	148		116		93
	Total property casualty insurance	4,045		3,713		3,344
	Life insurance	198		189		178
	Total	$	4,243	$	3,902	$	3,522
	Schedule III (continued)
	Cincinnati Financial Corporation and Subsidiaries
	Supplementary Insurance Information
	(Dollars in millions)	Years ended December 31,
		2014		2013		2012
	Investment income, net of expenses:
	Commercial lines insurance	$	—	$	—	$	—
	Personal lines insurance	—		—		—
	Excess and surplus lines insurance	—		—		—
	Total property casualty insurance (2)	358		348		351
	Life insurance	144		140		137
	Total	$	502	$	488	$	488
	Benefits, claims losses and settlement expenses:
	Commercial lines insurance	$	1,812	$	1,596	$	1,420
	Personal lines insurance	740		639		652
	Excess and surplus lines insurance	75		66		65
	Total property casualty insurance	2,627		2,301		2,137
	Life insurance	229		204		185
	Total	$	2,856	$	2,505	$	2,322
	Amortization of deferred policy acquisition costs:
	Commercial lines insurance	$	537	$	514	$	462
	Personal lines insurance	209		192		183
	Excess and surplus lines insurance	24		21		17
	Total property casualty insurance	770		727		662
Life insurance	37		31		45
Total (3)	$	807	$	758	$	707
Underwriting, acquisition and insurance expenses:
Commercial lines insurance	$	365	$	343	$	324
Personal lines insurance	84		98		78
Excess and surplus lines insurance	19		15		12
Total property casualty insurance	468		456		414
Life insurance	26		29		34
Total (3)	$	494	$	485	$	448
Net written premiums:
Commercial lines insurance	$	2,922	$	2,760	$	2,459
Personal lines insurance	1,068		1,005		918
Excess and surplus lines insurance	153		128		105
Total property casualty insurance	4,143		3,893		3,482
Accident health insurance	3		2		3
Total	$	4,146	$	3,895	$	3,485
Notes to Schedule III:
(1) The sum of gross future policy benefits, losses, claims and expense losses, gross unearned premium and other policy claims and benefits payable is equal to the sum of Loss and loss expense reserves, Life policy reserves and investment contract reserves and Unearned premiums reported in the company’s consolidated balance sheets.
(2) This segment information is not regularly allocated to segments and reviewed by company management in making decisions about resources to be allocated to the segments or to assess their performance.
(3) The sum of amortization of deferred policy acquisition costs and other underwriting and insurance expenses is equal to Underwriting, acquisition and insurance expenses in the consolidated statements of income.

Reinsurance_Schedule_IV

Reinsurance - Schedule IV	12 Months Ended
	Dec. 31, 2014
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Abstract]
Supplemental Schedule of Reinsurance Premiums for Insurance Companies [Text Block]	Schedule IV
	Cincinnati Financial Corporation and Subsidiaries
	Reinsurance
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Gross amounts:
	Life insurance in force	$	88,045		$	85,015		$	81,467
	Earned premiums
	Commercial lines insurance	$	2,973		$	2,777		$	2,524
	Personal lines insurance	1,080			1,002			897
	Excess and surplus lines insurance	156			124			99
	Total property casualty insurance	4,209			3,903			3,520
	Life insurance	259			248			235
	Total	$	4,468		$	4,151		$	3,755
	Ceded amounts to other companies:
	Life insurance in force	$	37,689		$	36,952		$	36,340
	Earned premiums
	Commercial lines insurance	$	128		$	151		$	149
	Personal lines insurance	40			42			30
	Excess and surplus lines insurance	8			8			6
	Total property casualty insurance	176			201			185
	Life insurance	61			59			57
	Total	$	237		$	260		$	242
	Assumed amounts from other companies:
	Life insurance in force	$	—		$	—		$	—
	Earned premiums
	Commercial lines insurance	$	11		$	10		$	8
	Personal lines insurance	1			1			1
	Excess and surplus lines insurance	—			—			—
	Total property casualty insurance	12			11			9
	Life insurance	—			—			—
	Total	$	12		$	11		$	9
	Net amounts:
	Life insurance in force	$	50,356		$	48,063		$	45,126
	Earned premiums
	Commercial lines insurance	$	2,856		$	2,636		$	2,383
	Personal lines insurance	1,041			961			868
	Excess and surplus lines insurance	148			116			93
	Total property casualty insurance	4,045			3,713			3,344
	Life insurance	198			189			178
	Total	$	4,243		$	3,902		$	3,522
	Percentage of amounts assumed to net:
	Life insurance in force	—		%	—		%	—		%
	Earned premiums
	Commercial lines insurance	0.4		%	0.4		%	0.3		%
	Personal lines insurance	0.1			0.1			0.1
	Excess and surplus lines insurance	—			—			—
	Total property casualty insurance	0.5			0.5			0.3
	Life insurance	—			—			—
	Total	0.5			0.5			0.3

Valuation_And_Qualifying_Accou

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Valuation And Qualifying Accounts	Schedule V
	Cincinnati Financial Corporation and Subsidiaries
	Valuation and Qualifying Accounts
	(Dollars in millions)	At December 31,
		2014			2013			2012
	Allowance for doubtful receivables:
	Balance at beginning of year	$	2		$	2		$	2
	Additions charged to costs and expenses	2			1			1
	Deductions	(1		)	(1		)	(1		)
	Balance at end of year	$	3		$	2		$	2

Supplementary_Information_Conc

Supplementary Information Concerning Property Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2014
Supplemental Information for Property, Casualty Insurance Underwriters [Abstract]
Supplementary Information Concerning Property Casualty Insurance Operations	Schedule VI
	Cincinnati Financial Corporation and Subsidiaries
	Supplementary Information Concerning Property Casualty Insurance Operations
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Deferred policy acquisition costs:
	Commercial lines insurance	$	257		$	251		$	235
	Personal lines insurance	108			104			93
	Excess and surplus lines insurance	14			11			9
	Total	$	379		$	366		$	337
	Reserves for unpaid claims and claim adjustment expenses:
	Commercial lines insurance	$	3,797		$	3,667		$	3,645
	Personal lines insurance	439			417			398
	Excess and surplus lines insurance	202			157			126
	Total	$	4,438		$	4,241		$	4,169
	Reserve discount deducted	$	—		$	—		$	—
	Unearned premiums:
	Commercial lines insurance	$	1,441		$	1,370		$	1,246
	Personal lines insurance	562			534			490
	Excess and surplus lines insurance	78			66			54
	Total	$	2,081		$	1,970		$	1,790
	Earned premiums:
	Commercial lines insurance	$	2,856		$	2,636		$	2,383
	Personal lines insurance	1,041			961			868
	Excess and surplus lines insurance	148			116			93
	Total	$	4,045		$	3,713		$	3,344
	Investment income:
	Commercial lines insurance	$	—		$	—		$	—
	Personal lines insurance	—			—			—
	Excess and surplus lines insurance	—			—			—
	Total (1)	$	358		$	348		$	351
	Loss and loss expenses incurred related to current accident year:
	Commercial lines insurance	$	1,869		$	1,691		$	1,712
	Personal lines insurance	752			678			751
	Excess and surplus lines insurance	104			79			70
	Total	$	2,725		$	2,448		$	2,533
	Loss and loss expenses incurred related to prior accident years:
	Commercial lines insurance	$	(57	)	$	(95	)	$	(292	)
	Personal lines insurance	(12		)	(39		)	(99		)
	Excess and surplus lines insurance	(29		)	(13		)	(5		)
	Total	$	(98	)	$	(147	)	$	(396	)
	Amortization of deferred policy acquisition costs:
	Commercial lines insurance	$	537		$	514		$	461
	Personal lines insurance	209			192			183
	Excess and surplus lines insurance	24			21			17
	Total	$	770		$	727		$	661
	Paid loss and loss expenses:
	Commercial lines insurance	$	1,666		$	1,498		$	1,546
	Personal lines insurance	717			639			659
	Excess and surplus lines insurance	30			35			24
	Total	$	2,413		$	2,172		$	2,229
	Net written premiums:
	Commercial lines insurance	$	2,922		$	2,760		$	2,459
	Personal lines insurance	1,068			1,005			918
	Excess and surplus lines insurance	153			128			105
	Total	$	4,143		$	3,893		$	3,482
	Note to Schedule VI:
	(1) This segment information is not regularly allocated to segments and not reviewed by company management in making decisions about resources to be allocated to the segments or to assess their performance.

Recovered_Sheet2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations
	Cincinnati Financial Corporation (CFC) operates through our insurance group and two complementary subsidiary companies.
	The Cincinnati Insurance Company leads our standard market property casualty insurance group that also includes two subsidiaries: The Cincinnati Casualty Company and The Cincinnati Indemnity Company. This group markets a broad range of standard market commercial and personal policies. The group focuses on delivery of quality customer service to our select group of 1,466 independent insurance agencies with 1,884 reporting locations across 39 states. Other subsidiaries of The Cincinnati Insurance Company include The Cincinnati Life Insurance Company, which markets life and disability income insurance and fixed annuities, and The Cincinnati Specialty Underwriters Insurance Company, which offers excess and surplus lines property casualty insurance products.
	The two CFC complementary subsidiaries are CSU Producer Resources Inc., which provides insurance brokerage services to our independent agencies so their clients can access our excess and surplus lines insurance products, and CFC Investment Company (CFC-I), which offers commercial leasing and financing services to our agents, their clients and other customers.
Basis of Presentation	Basis of Presentation
	Our consolidated financial statements include the accounts of the parent and its wholly owned subsidiaries and are presented in conformity with accounting principles generally accepted in the United States of America (GAAP). All intercompany balances and transactions have been eliminated in consolidation.
	The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the financial statements and accompanying notes. Our actual results could differ from those estimates.
Earnings per Share	Earnings per Share
	Net income per common share is based on the weighted average number of common shares outstanding during each of the respective years. We calculate net income per common share (diluted) assuming the exercise or conversion of share‑based awards using the treasury stock method.
Stock-Based Compensation	Share-Based Compensation
	We account for share-based compensation in accordance with Accounting Standards Codification (ASC) 718, Compensation – Stock Compensation. We grant qualified and nonqualified share-based compensation under authorized plans. The stock options vest ratably over three years following the date of grant and are exercisable over 10-year periods. We grant service-based restricted stock units that cliff vest three years after the date of grant. We also grant performance-based restricted stock units that vest if certain market conditions are attained. In 2014, the CFC compensation committee approved share-based awards including incentive stock options, nonqualified stock options, service-based restricted and performance-based restricted stock units. See Note 17, Share-Based Associate Compensation Plans, for further details.
Employee Benefit Pension Plan	Employee Benefit Pension Plan
	We sponsor a defined benefit pension plan that was modified during 2008. We closed entry into the pension plan, and only participants 40 years of age or older could elect to remain in the plan. Our pension expense is based on certain actuarial assumptions and also is composed of several components that are determined using the projected unit credit actuarial cost method. Refer to Note 13, Employee Retirement Benefits, for more information about our defined benefit pension plan.
Property Casualty Insurance	Property Casualty Insurance
	The consolidated property casualty companies actively write property casualty insurance through independent agencies in 39 states. Our 10 largest states generated 62.8 percent and 63.8 percent of total earned premiums in 2014 and 2013, respectively. Ohio, our largest state, accounted for 17.7 percent and 18.5 percent of total earned premiums in 2014 and 2013, respectively. Illinois, Indiana, Pennsylvania, Georgia, Michigan and North Carolina each accounted for between 5 percent and 8 percent of total earned premiums in 2014. Our largest single agency relationship accounted for approximately 0.8 percent of our total property casualty earned premiums in 2014. No aggregate agency relationship locations under a single ownership structure accounted for more than 2.1 percent of our total property casualty earned premiums in 2014. We record revenues for installment charges as Fee revenues in the consolidated statements of income.
	Property casualty written premiums are deferred and recorded as earned premiums on a pro rata basis over the terms of the policies. We record as unearned premiums the portion of written premiums that applies to unexpired policy terms. Expenses associated with successfully acquiring insurance policies – commissions, premium taxes and underwriting costs – are deferred and amortized over the terms of the policies. All acquisition costs are in accordance with ASU 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. We assess recoverability of deferred acquisition costs at the segment level, consistent with the way we acquire, service and manage insurance policies and measure profitability. We analyze our acquisition cost assumptions to reflect actual experience, and we evaluate potential premium deficiencies.
	Certain property casualty policies are not entered into policy underwriting systems as of the effective date of coverage. An actuarial estimate is made to determine the amount of these unprocessed written premiums. A large majority of the estimate is unearned and has no material impact on earned premiums.
	Premiums receivable are reviewed for impairment on a quarterly basis. We maintain an allowance for uncollectible premiums.
	We establish reserves to cover the expected cost of claims, losses and expenses related to investigating, processing and resolving claims. Although the appropriate amount of reserves is inherently uncertain, we base our decisions on past experience and current facts. Reserves are based on claims reported prior to the end of the year and estimates of unreported claims. We take into account the fact that we may recover some of our costs through salvage and subrogation. We regularly review and update reserves using the most current information available. Any resulting adjustments are reflected in current calendar year insurance losses and policyholder benefits.
Policyholder Dividends	Policyholder Dividends
	Certain workers’ compensation policies include the possibility of a policyholder earning a return of a portion of its premium in the form of a policyholder dividend. The dividend generally is calculated by determining the profitability of a policy year along with the associated premium. We reserve for all probable future policyholder dividend payments. We record policyholder dividends as other underwriting expenses.
Life Insurance	Life Insurance
	We offer several types of life insurance and disability income insurance, and we account for each according to the duration of the contract. Short-duration life and health contracts are written to cover claims that arise during a short, fixed term of coverage. We generally have the right to change the amount of premium charged or cancel the coverage at the end of each contract term. Group life insurance is an example. We record premiums for short-duration life and health contracts similarly to property casualty contracts.
	Long-duration contracts are written to provide coverage for an extended period of time. Traditional long-duration contracts require policyholders to pay scheduled gross premiums, generally not less frequently than annually, over the term of the coverage. Premiums for these contracts, such as whole life insurance and disability income insurance, are recognized as revenue when due. Some traditional long-duration contracts, such as ten-pay whole life insurance, have premium payment periods shorter than the period over which coverage is provided. For these contracts, the excess of premium over the amount required to pay expenses and benefits is recognized over the term of the coverage rather than over the premium payment period.
	We establish a liability for traditional long-duration contracts as we receive premiums. The amount of this liability is the present value of future expenses and benefits less the present value of future net premiums. Net premium is the portion of gross premium required to provide for all expenses and benefits. We estimate future expenses and benefits and net premium using assumptions for expected expenses, mortality, morbidity, withdrawal rates and investment income. We include a provision for deviation, meaning we allow for some uncertainty in making our assumptions. We establish our assumptions when the contract is issued, and we generally maintain those assumptions for the life of the contract. We use both our own experience and industry experience, adjusted for historical trends, in arriving at our assumptions for expected mortality, morbidity and withdrawal rates. We use our own experience and historical trends for setting our assumption for expected expenses. We base our assumption for expected investment income on our own experience, adjusted for current economic conditions.
	We capitalize acquisition costs for traditional long-duration contracts. We charge these capitalized costs associated with successfully acquiring traditional long-duration contract insurance policies over the premium-paying period of the policies. We use the same assumptions used in establishing the liability for the contract. All acquisition costs reflect the retrospective adoption of Accounting Standards Update (ASU) 2010-26, Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate our deferred acquisition cost for recoverability.
	Universal life contracts are long-duration contracts for which contractual provisions are not fixed, unlike whole life insurance. Universal life contracts allow policyholders to vary the amount of premium, within limits, without our consent. However, we may vary the mortality, expense charges and the interest crediting rate, within limits, used to accumulate policy values. We do not record universal life premiums as revenue. Instead we recognize as revenue the mortality charges, administration charges and surrender charges when received. Some of our universal life contracts assess administration charges in the early years of the contract that are compensation for services we will provide in the later years of the contract. These administration charges are deferred and are recognized over the period when we provide those future services.
	We maintain a liability equal to the policyholder account value. There is no provision for adverse deviation. Some of our universal life policies contain no-lapse guarantee provisions. For these policies, we establish a reserve in addition to the account balance, based on expected no-lapse guarantee benefits and expected policy assessments.
	We capitalize acquisition costs for universal life long-duration contracts. We charge these capitalized costs to expenses over the term of coverage of the contract in accordance with the recognition of gross profit from the contract. When we charge deferred policy acquisition costs to expenses, we use assumptions based on our best estimates of long-term experience. We review and modify these assumptions on a regular basis.
Separate Accounts	Separate Accounts
	We have issued universal life contracts with guaranteed minimum returns, referred to as bank-owned life insurance contracts (BOLIs). A BOLI is designed so the bank is the policy owner and the policy beneficiary. We legally segregate and record as separate accounts the assets and liabilities for some of our BOLIs, based on the specific contract provisions. We guarantee minimum investment returns, account values and death benefits for our separate account BOLIs. Our other BOLIs are general account products.
	We carry the assets of separate account BOLIs at fair value. The liabilities on separate account BOLIs primarily are the contract holders’ claims to the related assets and are carried at an amount equal to the contract holders’ account value. At December 31, 2014, the current fair value of the BOLI invested assets and cash exceeded the current fair value of the contract holders’ account value by approximately $47 million. If the BOLI projected fair value were to fall below the value we guaranteed, a liability would be established with a corresponding charge to the company’s earnings.
	Generally, investment income and realized investment gains and losses of the separate accounts accrue directly to the contract holder, and we do not include them in the consolidated statements of income. Revenues and expenses related to separate accounts consist of contractual fees and mortality, surrender and expense risk charges. Also, each separate account BOLI includes a negotiated capital gain and loss sharing arrangement between the company and the bank. A percentage of each separate account’s realized capital gain and loss representing contract fees and assessments accrues to us and is transferred from the separate account to our general account and is recognized as revenue or expense. We record as revenues separate account investment management fees in Fee revenues of the consolidated statements of income.
Reinsurance	Reinsurance
	We reduce risk and uncertainty by buying property casualty and life reinsurance. Reinsurance contracts do not relieve us from our obligation to policyholders, but rather help protect our financial strength to perform that duty. All of these ceded reinsurance contracts transfer the economic risk of loss. We continue to assume risk with limited exposure as a reinsurer for other insurance companies, reinsurers and involuntary state pools.
	Both reinsurance assumed and ceded premiums are deferred and recorded as earned premiums on a pro rata basis over the terms of the contract. We estimate loss amounts recoverable from our reinsurers based on the reinsurance policy terms. Historically, our claims with reinsurers have been paid. We do not have an allowance for uncollectible reinsurance.
Cash And Cash Equivalents	Cash and Cash Equivalents
	Cash and cash equivalents are highly liquid instruments that include liquid debt instruments with original maturities of less than three months. These are carried at cost, which approximates fair value.
Investments	Investments
	Our portfolio investments are primarily in publicly traded fixed-maturity, equity and short-term investments. Fixed-maturity investments (taxable bonds, tax-exempt bonds, redeemable preferred equities and commercial mortgage backed securities) and equity investments (common and nonredeemable preferred equities) are classified as available for sale and recorded at fair value in the consolidated financial statements. The number of fixed-maturity securities with fair value below 100 percent of amortized cost can be expected to fluctuate as interest rates rise or fall. Because of our strong surplus and long-term investment horizon, our general intent is to hold fixed-maturity investments until maturity, regardless of short-term fluctuations in fair values.
	Our invested asset impairment policy states that fixed maturities below their amortized cost that the company (1) intends to sell or (2) more likely than not will be required to sell before recovery of their amortized cost basis are deemed to be other-than-temporarily impaired (OTTI). The amortized cost of any such securities is reduced to fair value as the new cost basis, and a realized loss is recorded in the period in which it is recognized. When these two criteria are not met, and the company believes that full collection of interest and/or principal is not likely, we determine the net present value of future cash flows by using the effective interest rate implicit in the security at the date of acquisition as the discount rate and compare that amount with the amortized cost and fair value of the security. The difference between the net present value of the expected future cash flows and amortized cost of the security is considered a credit loss and recognized as a realized loss in the period in which it occurred. The difference between the fair value and the net present value of the cash flows of the security, the noncredit loss, is recognized in other comprehensive income as an unrealized loss. We had no fixed-maturity securities with a noncredit loss for the years ended 2014 and 2013.
	When determining OTTI charges for our equity portfolio, our invested asset impairment policy considers qualitative and quantitative factors, including facts and circumstances specific to individual securities, asset classes, the financial condition of the issuer, changes in dividend payment, the length of time fair value had been less than cost, the severity of the decline in fair value below cost, the volatility of the security and our ability and intent to hold each position until its forecasted recovery.
	We include the noncredit portion of fixed-maturity OTTI charges and all other unrealized gains and losses on investments, net of taxes, in shareholders’ equity as accumulated other comprehensive income (AOCI). Realized gains and losses on investments are recognized in net income based on the trade date accounting method.
	Included within our other invested assets are $31 million of life policy loans and $37 million of private equity investments. Life policy loans are carried at the receivable value. The private equity investments provide their financial statements to us and generally report investments on their balance sheets at fair value. We use the equity method of accounting for private equity investments.
	Investment income consists mainly of interest and dividends. We record interest on an accrual basis and record dividends at the ex-dividend date. We amortize premiums and discounts on fixed-maturity securities using the effective interest method over the expected life of the security.
Fair Value Disclosures	Fair Value Disclosures
	We account for our investment portfolio at fair value and apply fair value measurements as defined by ASC 820, Fair Value Measurements and Disclosures, to financial instruments. Fair value is applicable to ASC 320, Investments-Debt and Equity Securities, and ASC 825, Financial Instruments.
	ASC 820 defines fair value as the exit price or the amount that would be (1) received to sell an asset or (2) paid to transfer a liability in an orderly transaction between marketplace participants at the measurement date. When determining an exit price, we rely upon observable market data whenever possible. We primarily base fair value for investments in equity and fixed-maturity securities (including redeemable preferred stock and assets held in separate accounts) on quoted market prices or on prices from a pricing vendor, an outside resource that supplies global securities pricing, dividend, corporate action and descriptive information to support fund pricing, securities operations, research and portfolio management. The company obtains and reviews the pricing service’s valuation methodologies and related inputs and validates these prices by replicating a sample across each asset class using a discounted cash flow model. When a price is not available from these sources, as in the case of securities that are not publicly traded, we determine the fair value using various inputs including quotes from independent brokers. The fair value of investments not priced by a pricing vendor is less than 1 percent of the fair value of our total investment portfolio.
	For the purpose of ASC 825 disclosure, we base fair value for long-term senior notes on market pricing of similar debt instruments that are actively trading. We base fair value for notes payable on our year-end outstanding balance because it is short term and tied to a variable interest rate. We estimate the fair value of liabilities for investment contracts and annuities using discounted cash flow calculations across a wide range of economic interest rate scenarios with a provision for our nonperformance risk. We estimate the fair value for policyholder loans on insurance contracts using a discounted cash flow model. Determination of fair value for structured settlements assumes the discount rates used to calculate the present value of expected payments are the risk-free spot rates plus an A3 rated bond spread for financial issuers at December 31, 2014, to account for nonperformance risk. See Note 3, Fair Value Measurements, for further details.
Land, Building And Equipment	Land, Building and Equipment
	We record land at cost, and record building and equipment at cost less accumulated depreciation. Equipment held under capital leases also is classified as property and equipment with the related lease obligations recorded as liabilities. We capitalize and amortize costs for internally developed computer software during the application development stage. These costs generally consist of external consulting, payroll and payroll-related costs. Our depreciation is based on estimated useful lives (ranging from three years to 39.5 years) using straight-line and accelerated methods. Depreciation expense was $37 million for each year in 2014, 2013 and 2012. We monitor land, building and equipment and software assets for potential impairments. Potential impairments may include a significant decrease in the fair values of the assets, considerable cost overruns on projects, a change in legal factors or business climate or other factors that indicate that the carrying amount may not be recoverable or useful. There were no recorded land, building and equipment impairments for 2014, 2013 or 2012.
Income Taxes	Income Taxes
	We calculate deferred income tax liabilities and assets using tax rates in effect when temporary differences in financial statement income and taxable income are expected to reverse. We recognize deferred income taxes for numerous temporary differences between our taxable income and financial statement income and other changes in shareholders’ equity. Such temporary differences relate primarily to unrealized gains and losses on investments and differences in the recognition of deferred acquisition costs, unearned premium and insurance reserves. We charge deferred income taxes associated with balances that impact other comprehensive income, such as unrealized appreciation and depreciation of investments (except the amounts related to the effect of income tax rate changes), to shareholders’ equity in AOCI. We charge deferred taxes associated with other differences to income.
	See Note 11, Income Taxes, for further detail on our uncertain tax positions. Although no Internal Revenue Service (IRS) penalties currently are accrued, if incurred, they would be recognized as a component of income tax expense.
Finance Receivables	Finance Receivables
	Our leasing subsidiary provides auto and equipment direct financing (leases and loans) to commercial and individual clients. We generally transfer ownership of the property to the client as the terms of the leases expire. Our lease contracts contain bargain purchase options. We account for these leases and loans as direct financing-type leases. We capitalize and amortize lease or loan origination costs over the life of the financing, using the effective interest method. These costs may include, but are not limited to finder fees, broker fees, filing fees and the cost of credit reports. We record income in the Other revenues of the consolidated statements of income over the financing term using the effective interest method. Finance receivables are reviewed for impairment on a quarterly basis and considered insignificant to our consolidated financial condition, results of operations and cash flows.
Subsequent Events	Subsequent Events
	There were no subsequent events requiring adjustment to the financial statements or disclosure.
Pending Accounting Updates	Pending Accounting Updates
	ASU 2014-09, Revenue from Contracts with Customers
	In May 2014, the Financial Accounting Standards Board (FASB) issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. Insurance contracts do not fall within the scope of this ASU. The effective date of ASU 2014-09 is for annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, there is not expected to be a material impact on our company’s consolidated financial position, cash flows or results of operations.
	ASU 2014-12, Compensation-Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period
	In June 2014, the FASB Issued ASU 2014-12, Compensation-Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 requires that performance targets that affect vesting and that could be achieved after the requisite service period be treated as performance conditions. The effective date of ASU 2014-12 is for interim and annual reporting periods beginning after December 15, 2015. The ASU has not yet been adopted and will not have a material impact on our company’s consolidated financial position, cash flows or results of operations.
	ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis
	In February 2015, the FASB Issued ASU 2015-02, Consolidation (Topic 810) - Amendments to the Consolidation Analysis. ASU 2015-02 makes amendments to the current consolidation guidance, focusing mainly on the investment management industry; however entities across all industries will be impacted. The effective date of ASU 2015-02 is for interim and annual reporting periods beginning after December 15, 2015. The ASU has not yet been adopted; however, there is not expected to be a material impact on our company’s consolidated financial position, cash flows or results of operations.

Investments_Tables

Investments (Tables)	12 Months Ended
	Dec. 31, 2014
Investments [Abstract]
Analysis Of Cost Or Amortized Cost, Gross Unrealized Gains And Losses And Fair Value for Investments	The following table provides cost or amortized cost, gross unrealized gains, gross unrealized losses and fair value for our fixed-maturity and equity securities:
	(Dollars in millions)	Cost or			Gross unrealized						Fair
		amortized									value
	At December 31, 2014	cost			gains			losses
	Fixed-maturity securities:
	Corporate	$	5,117		$	420		$	11		$	5,526
	States, municipalities and political subdivisions	3,267			178			2			3,443
	Commercial mortgage-backed	250			9			—			259
	Government-sponsored enterprises	213			—			5			208
	Foreign government	10			—			—			10
	Convertibles and bonds with warrants attached	7			—			—			7
	United States government	7			—			—			7
	Subtotal	8,871			607			18			9,460
	Equity securities:
	Common equities	2,583			2,099			3			4,679
	Nonredeemable preferred equities	145			35			1			179
	Subtotal	2,728			2,134			4			4,858
	Total	$	11,599		$	2,741		$	22		$	14,318
	At December 31, 2013
	Fixed-maturity securities:
	Corporate	$	5,122		$	433		$	22		$	5,533
	States, municipalities and political subdivisions	3,107			125			21			3,211
	Commercial mortgage-backed	148			—			5			143
	Government-sponsored enterprises	227			—			27			200
	Foreign government	10			—			—			10
	Convertibles and bonds with warrants attached	17			—			—			17
	United States government	7			—			—			7
	Subtotal	8,638			558			75			9,121
	Equity securities:
	Common equities	2,396			1,818			1			4,213
	Nonredeemable preferred equities	127			38			3			162
	Subtotal	2,523			1,856			4			4,375
	Total	$	11,161		$	2,414		$	79		$	13,496
Fair Values And Unrealized Losses by Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position	The table below provides fair values and unrealized losses by investment category and by the duration of the securities’ continuous unrealized loss position:
	(Dollars in millions)	Less than 12 months						12 months or more					Total
	At December 31, 2014	Fair			Unrealized			Fair			Unrealized		Fair		Unrealized
		value			losses			value			losses		value		losses
	Fixed maturity securities:
	Corporate	$	261		$	8		$	90		$	3	$	351	$	11
	States, municipalities and political subdivisions	17			—			135			2		152		2
	Commercial mortgage-backed	3			—			23			—		26		—
	Government-sponsored enterprises	11			—			181			5		192		5
	Subtotal	292			8			429			10		721		18
	Equity securities:
	Common equities	85			3			—			—		85		3
	Nonredeemable preferred equities	16			—			17			1		33		1
	Subtotal	101			3			17			1		118		4
	Total	$	393		$	11		$	446		$	11	$	839	$	22
	At December 31, 2013
	Fixed maturity securities:
	Corporate	$	572		$	20		$	43		$	2	$	615	$	22
	States, municipalities and political subdivisions	490			18			42			3		532		21
	Commercial mortgage-backed	125			5			—			—		125		5
	Government-sponsored enterprises	199			27			1			—		200		27
	Foreign government	10			—			—			—		10		—
	United States government	1			—			—			—		1		—
	Subtotal	1,397			70			86			5		1,483		75
	Equity securities:
	Common equities	77			1			—			—		77		1
	Nonredeemable preferred equities	42			3			—			—		42		3
	Subtotal	119			4			—			—		119		4
	Total	$	1,516		$	74		$	86		$	5	$	1,602	$	79
Contractual Maturity Dates For Fixed-Maturity And Short-Term Investments	Contractual maturity dates for fixed-maturity investments were:
	(Dollars in millions)	Amortized cost			Fair			% of fair value
	At December 31, 2014				value
	Maturity dates occurring:
	Less than 1 year	$	502		$	509		5.4	%
	Years 1 - 5	3,404			3,687			39
	Years 5 - 10	3,322			3,506			37
	Due after ten years	1,643			1,758			18.6
	Total	$	8,871		$	9,460		100	%
Investment Income, Realized Investment Gains And Losses And Change In Unrealized Investment Gains And Losses	The following table provides investment income, realized investment gains and losses and the change in unrealized investment gains and losses, by investment category:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Investment income:
	Interest	$	417		$	413		$	420
	Dividends	138			122			115
	Other	2			3			3
	Total	557			538			538
	Less investment expenses	8			9			7
	Total	$	549		$	529		$	531
	Realized investment gains and losses summary:
	Fixed maturities:
	Gross realized gains	$	21		$	15		$	36
	Gross realized losses	(3		)	—			—
	Other-than-temporary impairments	(15		)	(2		)	(1		)
	Equity securities:
	Gross realized gains	136			64			39
	Gross realized losses	—			—			(2		)
	Other-than-temporary impairments	(9		)	—			(32		)
	Other	3			6			2
	Total	$	133		$	83		$	42
	Change in unrealized investment gains and losses:
	Fixed maturities	$	106		$	(387	)	$	176
	Equity securities	278			847			210
	Less income taxes	134			161			135
	Total	$	250		$	299		$	251

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Hierarchy for Assets Measured at Fair Value on a Recurring Basis	The following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at December 31, 2014 and 2013. We do not have any material liabilities carried at fair value. There were no transfers between Level 1 and Level 2 for the years ended December 31, 2014 and 2013.
	(Dollars in millions)		Quoted prices in						Significant
			active markets for						unobservable
			identical assets						inputs
	At December 31, 2014		(Level 1)			Significant other			(Level 3)		Total
						observable inputs
						(Level 2)
	Fixed maturities, available for sale:
	Corporate		$	—		$	5,508		$	18	$	5,526
	States, municipalities and political subdivisions		—			3,443			—		3,443
	Commercial mortgage-backed		—			259			—		259
	Government-sponsored enterprises		—			208			—		208
	Foreign government		—			10			—		10
	Convertibles and bonds with warrants attached		—			7			—		7
	United States government		7			—			—		7
	Subtotal		7			9,435			18		9,460
	Common equities, available for sale		4,679			—			—		4,679
	Nonredeemable preferred equities, available for sale		—			177			2		179
	Separate accounts taxable fixed maturities		—			731			—		731
	Top Hat Savings Plan - mutual funds and common equities (included in Other assets)		18			—			—		18
	Total		$	4,704		$	10,343		$	20	$	15,067
	At December 31, 2013
	Fixed maturities, available for sale:
	Corporate		$	—		$	5,531		$	2	$	5,533
	States, municipalities and political subdivisions		—			3,211			—		3,211
	Commercial mortgage-backed		—			143			—		143
	Government-sponsored enterprises		—			200			—		200
	Foreign government		—			10			—		10
	Convertibles and bonds with warrants attached		—			17			—		17
	United States government		7			—			—		7
	Subtotal		7			9,112			2		9,121
	Common equities, available for sale		4,213			—			—		4,213
	Nonredeemable preferred equities, available for sale		—			160			2		162
	Separate accounts taxable fixed maturities		—			682			—		682
	Top Hat Savings Plan - mutual funds and common equities (included in Other assets)		14			—			—		14
	Total		$	4,234		$	9,954		$	4	$	14,192
Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	The following table provides the change in Level 3 assets during 2014 and 2013:
	(Dollars in millions)	Asset fair value measurements using significant unobservable inputs (Level 3)
			Corporate			States,			Nonredeemable preferred		Total
			fixed			municipalities			equities
			maturities			and political
						subdivisions
						fixed maturities
	Beginning balance, January 1, 2014		$	2		$	—		$	2	$	4
	Total gains or losses (realized/unrealized):
	Included in net income		—			—			—		—
	Included in other comprehensive income		—			—			—		—
	Purchases		—			—			—		—
	Sales		—			—			—		—
	Transfers into Level 3		16			—			—		16
	Transfers out of Level 3		—			—			—		—
	Ending balance, December 31, 2014		$	18		$	—		$	2	$	20
	Beginning balance, January 1, 2013		$	3		$	1		$	1	$	5
	Total gains or losses (realized/unrealized):
	Included in net income		—			—			—		—
	Included in other comprehensive income		—			—			—		—
	Purchases		—			—			1		1
	Sales		—			(1		)	—		(1		)
	Transfers into Level 3		—			—			—		—
	Transfers out of Level 3		(1		)	—			—		(1		)
	Ending balance, December 31, 2013		$	2		$	—		$	2	$	4
Fair Value of Life Policy Loans	The following table shows the fair value of our life policy loans, included in other invested assets:
	(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
			active markets for			observable inputs			unobservable
			identical assets			(Level 2)			inputs
	At December 31, 2014		(Level 1)						(Level 3)
	Life policy loans		$	—		$	—		$	39	$	39
	At December 31, 2013
	Life policy loans		$	—		$	—		$	45	$	45
Debt
Fair Values of Deferred Annuities, Structured Settlements and Other Items	The following table shows fair values of our note payable and long-term debt:
	(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
			active markets for			observable inputs			unobservable
			identical assets			(Level 2)			inputs
	At December 31, 2014		(Level 1)						(Level 3)
	Note payable		$	—		$	49		$	—	$	49
	6.900% senior debentures, due 2028		—			34			—		34
	6.920% senior debentures, due 2028		—			496			—		496
	6.125% senior notes, due 2034		—			449			—		449
	Total		$	—		$	1,028		$	—	$	1,028
	At December 31, 2013
	Note payable		$	—		$	104		$	—	$	104
	6.900% senior debentures, due 2028		—			30			—		30
	6.920% senior debentures, due 2028		—			458			—		458
	6.125% senior notes, due 2034		—			399			—		399
	Total		$	—		$	991		$	—	$	991
Deferred Annuities and Structured Settlements
Fair Values of Deferred Annuities, Structured Settlements and Other Items	The following table shows fair value of our deferred annuities and structured settlements included in life policy and investment contract reserves:
	(Dollars in millions)		Quoted prices in			Significant other			Significant		Total
			active markets for			observable inputs			unobservable
			identical assets			(Level 2)			inputs
	At December 31, 2014		(Level 1)						(Level 3)
	Deferred annuities		$	—		$	—		$	897	$	897
	Structured settlements		—			217			—		217
	Total		$	—		$	217		$	897	$	1,114
	At December 31, 2013
	Deferred annuities		$	—		$	—		$	911	$	911
	Structured settlements		—			219			—		219
	Total		$	—		$	219		$	911	$	1,130

Property_Casualty_Loss_And_Los1

Property Casualty Loss And Loss Expenses (Tables)	12 Months Ended
	Dec. 31, 2014
Insurance [Abstract]
Consolidated Property Casualty Loss And Loss Expense Reserves	This table summarizes activity for our consolidated property casualty loss and loss expense reserves:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Gross loss and loss expense reserves, January 1	$	4,241		$	4,169		$	4,280
	Less reinsurance recoverable	299			356			375
	Net loss and loss expense reserves, January 1	3,942			3,813			3,905
	Net incurred loss and loss expenses related to:
	Current accident year	2,725			2,448			2,533
	Prior accident years	(98		)	(147		)	(396		)
	Total incurred	2,627			2,301			2,137
	Net paid loss and loss expenses related to:
	Current accident year	1,212			1,045			1,123
	Prior accident years	1,201			1,127			1,106
	Total paid	2,413			2,172			2,229
	Net loss and loss expense reserves, December 31	4,156			3,942			3,813
	Plus reinsurance recoverable	282			299			356
	Gross loss and loss expense reserves, December 31	$	4,438		$	4,241		$	4,169

Life_Policy_And_Investment_Con1

Life Policy And Investment Contract Reserves (Tables)	12 Months Ended
	Dec. 31, 2014
Liability for Future Policy Benefits [Abstract]
Reserve In Addition To The Account Balance, Based on Expected No-Lapse Guarantee Benefits And Expected Policy Assessments	This table summarizes our life policy and investment contract reserves:
	(Dollars in millions)	At December 31,
		2014		2013
	Ordinary/traditional life	$	875	$	815
	Deferred annuities	863		862
	Universal life	530		508
	Structured settlements	182		189
	Other	47		16
	Total life policy and investment contract reserves	$	2,497	$	2,390

Deferred_Policy_Acquisition_Co1

Deferred Policy Acquisition Costs (Tables)	12 Months Ended
	Dec. 31, 2014
Deferred Costs [Abstract]
Deferred Policy Acquisition Costs And Asset Reconciliation, Including the Amortized Deferred Policy Acquisition Costs	The table below shows the deferred policy acquisition costs and asset reconciliation:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Deferred policy acquisition costs asset, January 1	$	565		$	470		$	477
	Capitalized deferred policy acquisition costs	827			802			734
	Amortized deferred policy acquisition costs	(807		)	(758		)	(706		)
	Amortized shadow deferred policy acquisition costs	(7		)	51			(35		)
	Deferred policy acquisition costs asset, December 31	$	578		$	565		$	470

LongTerm_Debt_And_Capital_Leas1

Long-Term Debt And Capital Lease Obligation (Tables)	12 Months Ended
	Dec. 31, 2014
Long-term Debt and Capital Lease Obligations [Abstract]
Book Value And Principal Amounts Of Long-Term Debt	This table summarizes the principal amounts of our long-term debt excluding unamortized discounts, none of which are encumbered by rating triggers:
	(Dollars in millions)					Book value						Principal amount
	Interest rate		Year of			December 31,			December 31,			December 31,			December 31,
			issue			2014			2013			2014			2013
	6.90%		1998	Senior debentures, due 2028		$	28		$	28		$	28		$	28
	6.92%		2005	Senior debentures, due 2028		391			391			391			391
	6.13%		2004	Senior notes, due 2034		372			371			374			374
				Total		$	791		$	790		$	793		$	793
Capital Lease Payments Over Next Five Years	Below are the expected capital lease obligations that we expect to pay over the next six years:
	(Dollars in millions)	Years ended December 31,
		2015			2016			2017			2018			2019			2020
	Capital lease obligations	$	18		$	9		$	3		$	2		$	3		$	1

Shareholders_Equity_And_Divide1

Shareholders' Equity And Dividend Restrictions (Tables)	12 Months Ended
	Dec. 31, 2014
Shareholders Equity And Dividend Restrictions [Abstract]
Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations	The changes from the beginning of year to the end of year are the result of changes to other comprehensive income or loss (OCI).
	(Dollars in millions)	2014									2013									2012
		Before			Income			Net			Before			Income			Net			Before			Income			Net
		tax			tax						tax			tax						tax			tax
	Investments:
	AOCI, January 1	$	2,335		$	808		$	1,527		$	1,875		$	647		$	1,228		$	1,489		$	512		$	977
	OCI before realized gains recognized in net income	514			181			333			537			188			349			426			149			277
	Realized gains recognized in net income	(130		)	(47		)	(83		)	(77		)	(27		)	(50		)	(40		)	(14		)	(26		)
	OCI	384			134			250			460			161			299			386			135			251
	AOCI, December 31	$	2,719		$	942		$	1,777		$	2,335		$	808		$	1,527		$	1,875		$	647		$	1,228
	Pension Obligations:
	AOCI, January 1	$	(18	)	$	(6	)	$	(12	)	$	(101	)	$	(35	)	$	(66	)	$	(88	)	$	(31	)	$	(57	)
	OCI before realized losses recognized in net income	(21		)	(7		)	(14		)	83			29			54			(13		)	(4		)	(9		)
	Realized losses recognized in net income	3			1			2			—			—			—			—			—			—
	OCI	(18		)	(6		)	(12		)	83			29			54			(13		)	(4		)	(9		)
	AOCI, December 31	$	(36	)	$	(12	)	$	(24	)	$	(18	)	$	(6	)	$	(12	)	$	(101	)	$	(35	)	$	(66	)
	Life deferred acquisition costs, life policy reserves and other:
	AOCI, January 1	$	(16	)	$	(5	)	$	(11	)	$	(50	)	$	(17	)	$	(33	)	$	(29	)	$	(10	)	$	(19	)
	OCI before realized gains recognized in net income	7			3			4			40			14			26			(19		)	(7		)	(12		)
	Realized gains recognized in net income	(3		)	(1		)	(2		)	(6		)	(2		)	(4		)	(2		)	—			(2		)
	OCI	4			2			2			34			12			22			(21		)	(7		)	(14		)
	AOCI, December 31	$	(12	)	$	(3	)	$	(9	)	$	(16	)	$	(5	)	$	(11	)	$	(50	)	$	(17	)	$	(33	)
	Summary of AOCI:
	AOCI, January 1	$	2,301		$	797		$	1,504		$	1,724		$	595		$	1,129		$	1,372		$	471		$	901
	Investments OCI	384			134			250			460			161			299			386			135			251
	Pension obligations OCI	(18		)	(6		)	(12		)	83			29			54			(13		)	(4		)	(9		)
	Life deferred acquisition costs, life policy reserves and other OCI	4			2			2			34			12			22			(21		)	(7		)	(14		)
	Total OCI	370			130			240			577			202			375			352			124			228
	AOCI, December 31	$	2,671		$	927		$	1,744		$	2,301		$	797		$	1,504		$	1,724		$	595		$	1,129

Reinsurance_Tables

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2014
Reinsurance Disclosures [Abstract]
Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business	Our consolidated statements of income include earned consolidated property casualty insurance premiums on assumed and ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct earned premiums	$	4,209		$	3,903		$	3,520
	Assumed earned premiums	12			11			9
	Ceded earned premiums	(176		)	(201		)	(185		)
	Earned premiums	$	4,045		$	3,713		$	3,344
Incurred Consolidated Property Casualty Insurance Loss And Loss Expenses On Assumed And Ceded Business	Our consolidated statements of income include incurred consolidated property casualty insurance loss and loss expenses on assumed and ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct incurred loss and loss expenses	$	2,661		$	2,323		$	2,235
	Assumed incurred loss and loss expenses	6			11			6
	Ceded incurred loss and loss expenses	(40		)	(33		)	(104		)
	Incurred loss and loss expenses	$	2,627		$	2,301		$	2,137
Earned Life Insurance Premiums On Ceded Business	Our consolidated statements of income include earned life insurance premiums on ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct earned premiums	$	259		$	248		$	235
	Ceded earned premiums	(61		)	(59		)	(57		)
	Earned premiums	$	198		$	189		$	178
Life Insurance Contract Holders' Benefits Incurred On Ceded Business	Our consolidated statements of income include life insurance contract holders’ benefits incurred on ceded business:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Direct contract holders' benefits incurred	$	299		$	266		$	232
	Ceded contract holders' benefits incurred	(70		)	(62		)	(47		)
	Contract holders' benefits incurred	$	229		$	204		$	185

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components Of Deferred Tax Assets And Liabilities	The significant components of deferred tax assets and liabilities included in the consolidated balance sheets at December 31 were as follows:
	(Dollars in millions)	At December 31,
		2014			2013
	Deferred tax assets:
	Loss and loss expense reserves	$	197		$	206
	Unearned premiums	145			137
	Investments	16			19
	Other	41			46
	Total	399			408
	Deferred tax liabilities:
	Unrealized investment gains, net	937			807
	Deferred acquisition costs	183			178
	Life policy reserves	110			86
	Other	9			10
	Total	1,239			1,081
	Net deferred income tax liability	$	840		$	673
Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate	The differences between the 35 percent statutory federal income tax rate and our effective income tax rate were as follows:
	(Dollars in millions)	Years ended December 31,
		2014					2013					2012
	Tax at statutory rate:	$	252		35	%	$	250		35	%	$	198		35	%
	Increase (decrease) resulting from:
	Tax-exempt income from municipal bonds	(33		)	(4.6	)	(32		)	(4.5	)	(33		)	(5.9	)
	Dividend received exclusion	(29		)	(4.0	)	(26		)	(3.6	)	(24		)	(4.2	)
	Other	6			0.8		5			0.7		4			0.7
	Provision for income taxes	$	196		27.2	%	$	197		27.6	%	$	145		25.6	%

Net_Income_Per_Common_Share_Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Calculations For Basic And Diluted Earnings Per Share	The table shows calculations for basic and diluted earnings per share:
	(In millions except per share data)	Years ended December 31,
		2014		2013		2012
	Numerator:
	Net income—basic and diluted	$	525	$	517	$	421
	Denominator:
	Basic weighted-average common shares outstanding	163.5		163.5		162.5
	Effect of stock-based awards:
	Stock options	1		1.2		0.5
	Nonvested shares	0.6		0.7		0.7
	Diluted weighted-average shares	165.1		165.4		163.7
	Earnings per share:
	Basic	$	3.21	$	3.16	$	2.59
	Diluted	3.18		3.12		2.57
	Number of anti-dilutive stock-based awards	0.7		0.4		5.9

Employee_Retirement_Benefits_T

Employee Retirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP	Benefit obligation activity using an actuarial measurement date for our qualified plan and SERP at December 31 follows:
	(Dollars in millions)	At December 31,
		2014				2013
	Change in projected benefit obligation:
	Benefit obligation, January 1	$	284			$	320
	Service cost	10				13
	Interest cost	15				13
	Actuarial loss (gain)	35				(34		)
	Benefits paid	(27		)		(28		)
	Other	2				—
	Projected benefit obligation, December 31	$	319			$	284
	Accumulated benefit obligation	$	284			$	257
	Change in plan assets:
	Fair value of plan assets, January 1	$	280			$	238
	Actual return on plan assets	30				55
	Employer contribution	5				15
	Benefits paid	(27		)		(28		)
	Fair value of plan assets, December 31	$	288			$	280
	Funded status, December 31	$	(31	)		$	(4	)
Reconciliation Of The Funded Status For Qualified Plan And SERP	A reconciliation follows of the funded status for our qualified plan and SERP at the end of the measurement period to the amounts recognized in the consolidated balance sheets at December 31:
	(Dollars in millions)	At December 31,
		2014				2013
	Pension amounts recognized in the consolidated balance sheets:
	Other assets	$	—			$	4
	Other liabilities	(31		)		(8		)
	Net amount recognized	$	(31	)		$	(4	)
	Amounts recognized in accumulated other comprehensive income:
	Net actuarial loss	$	34			$	18
	Prior service cost	2				—
	Total	$	36			$	18
Components Of Net Periodic Benefit Cost As Well As Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income For Qualified Plan And SERP	Below are the components of our net periodic benefit cost, as well as other changes in plan assets and benefit obligations recognized in other comprehensive income for our qualified plan and SERP at December 31:
	(Dollars in millions)	Years ended December 31,
		2014				2013				2012
	Net periodic benefit cost:
	Service cost	$	10			$	13			$	12
	Interest cost	15				13				14
	Expected return on plan assets	(17		)		(17		)		(16		)
	Amortization of actuarial loss and prior service cost	2				9				8
	Other	3				2				—
	Net periodic benefit cost	$	13			$	20			$	18
	(Dollars in millions)	Years ended December 31,
		2014				2013				2012
	Other changes in plan assets and benefit obligations recognized in
	other comprehensive income:
	Current year actuarial loss (gain)	$	21			$	(72	)		$	20
	Amortization of actuarial loss	(5		)		(10		)		(6		)
	Current year prior service cost	2				—				—
	Amortization of prior service cost	—				(1		)		(1		)
	Total recognized in other comprehensive loss (income)	$	18			$	(83	)		$	13
Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis
	(Dollars in millions)	Quoted prices in				Significant other				Significant			Total
		active markets for				observable inputs (Level 2)				unobservable
		identical assets (Level 1)								inputs
	At December 31, 2014									(Level 3)
	Fixed maturities, available for sale:
	States, municipalities and political subdivisions	$	—			$	33			$	—		$	33
	Corporate securities	—				19				—			19
	Total fixed maturities, available for sale	—				52				—			52
	Common equities, available for sale	225				—				—			225
	Total	$	225			$	52			$	—		$	277
	At December 31, 2013
	Fixed maturities, available for sale:
	States, municipalities and political subdivisions	$	—			$	32			$	—		$	32
	Corporate securities	—				21				—			21
	Total fixed maturities, available for sale	—				53				—			53
	Common equities, available for sale	208				—				—			208
	Total	$	208			$	53			$	—		$	261
Expected Future Benefit Payments For Qualified Plan And SERP	We expect to make the following benefit payments for our qualified plan and SERP, reflecting expected future service:
	(Dollars in millions)	Years ended December 31,
		2015				2016				2017			2018			2019		2020 - 2024
	Expected future benefit payments	$	26			$	32			$	29		$	23		$	24	$	142
Benefit Obligations
Weighted-Average Assumptions Used	This is a summary of the weighted-average assumptions used to determine our benefit obligations at December 31 for the plans:
		Qualified Pension Plan						SERP
		2014			2013			2014			2013
	Discount rate	4.25	%		5.15	%		4.05	%		4.8	%
	Rate of compensation increase	2.75-3.25			2.75-3.25			2.75-3.25			2.75-3.25
Net Periodic Benefit Cost
Weighted-Average Assumptions Used	This is a summary of the weighted-average assumptions used to determine our net expense for the plans:
		Qualified Pension Plan									SERP
		2014			2013			2012			2014		2013		2012
	Discount rate	5.15	%		4.2	%		5.1	%		4.8	%	3.95	%	4.75	%
	Expected return on plan assets	7.25			7.5			7.5			n/a		n/a		n/a
	Rate of compensation increase	2.75-3.25			2.75-3.25			3.50-5.50			2.75-3.25		2.75-3.25		3.50-5.50

Statutory_Accounting_Informati1

Statutory Accounting Information (Tables)	12 Months Ended
	Dec. 31, 2014
Staturory Accounting Information [Abstract]
Statutory Net Income And Statutory Surplus	The statutory net income (loss) and statutory capital and surplus are presented below:
	(Dollars in millions)	Net income (loss)								Capital and surplus
		Years ended December 31,								At December 31,
		2014			2013			2012		2014		2013
	The Cincinnati Insurance Company	$	436		$	418		$	334	$	4,472	$	4,326
	The Cincinnati Casualty Company	12			10			10		330		317
	The Cincinnati Indemnity Company	3			2			2		86		82
	The Cincinnati Specialty Underwriters Insurance Company	32			18			6		266		228
	The Cincinnati Life Insurance Company	(19		)	(20		)	5		223		247

ShareBased_Associate_Compensat1

Share-Based Associate Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation [Abstract]
Assumptions Used In Option Grants Issued	The following weighted average assumptions were used in determining fair value for option grants issued during 2014 and 2013:
		2014		2013		2012
	Weighted-average expected term	8-9 years		9-10 years		8-10 years
	Expected volatility	25.20-26.22%		25.25-26.31%		25.26-26.20%
	Dividend yield	3.76%		3.65%		4.51-4.52%
	Risk-free rates	2.42-2.62%		1.82-2.00%		1.58-2.00%
	Weighted-average fair value of options granted during the period	$10.16		$9.71		$6.78
Stock Option Information	This is a summary of options information:
	(Dollars in millions, shares in thousands)	Shares			Weighted-				Aggregate
					average				intrinsic
					exercise price				value
	Outstanding shares at January 1, 2014	6,332			$	38.39
	Granted	401			46.81
	Exercised	(1,086	)		37.59
	Forfeited or expired	(689	)		39.49
	Outstanding shares at December 31, 2014	4,958			39.1				$	66
	Options exercisable at end of period	4,165			$	38.17			$	59
Options Outstanding And Exercisable	Options outstanding and exercisable consisted of the following at December 31, 2014:
	(Shares in thousands)	Options outstanding									Options exercisable
	Range of exercise prices	Shares			Weighted-average		Weighted-				Shares			Weighted-
					remaining contractual		average							average
					life		exercise price							exercise price
	$25.00 to $29.99	731			4.58 years		$	26.58			731			$	26.58
	$30.00 to $34.99	675			6.01 years		33.96				675			33.96
	$35.00 to $39.99	981			4.90 years		37.31				824			37.63
	$40.00 to $44.99	1,258			3.09 years		43.58				1,015			43.32
	$45.00 to $49.99	1,313			3.50 years		45.73				920			45.26
	Total	4,958			4.17 years		39.1				4,165			38.17
Restricted Stock Unit Information	This is a summary of service-based and performance-based share information, assuming a target payout for performance-based shares, for the year 2014:
	(Shares in thousands)	Service-based			Weighted-				Performance-based			Weighted-
		shares			average grant				shares			average grant
					date fair value							date fair value
	Nonvested at January 1, 2014	936			$	33.61			246			$	37.66
	Granted	331			41.84				99			36.03
	Vested	(271	)		29.79				(60	)		30.91
	Forfeited or canceled	(28	)		36.28				(2	)		31.77
	Nonvested at December 31, 2014	968			37.42				283			38.55

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Information	This table summarizes segment information:
	(Dollars in millions)	Years ended December 31,
		2014			2013			2012
	Revenues:
	Commercial lines insurance
	Commercial casualty	$	938		$	856		$	767
	Commercial property	728			623			545
	Commercial auto	528			479			426
	Workers' compensation	370			365			344
	Other commercial lines	292			313			301
	Commercial lines insurance premiums	2,856			2,636			2,383
	Fee revenues	4			3			4
	Total commercial lines insurance	2,860			2,639			2,387
	Personal lines insurance
	Personal auto	476			443			404
	Homeowner	443			403			353
	Other personal lines	122			115			111
	Personal lines insurance premiums	1,041			961			868
	Fee revenues	2			1			2
	Total personal lines insurance	1,043			962			870
	Excess and surplus lines insurance	148			116			93
	Life insurance premiums	198			189			178
	Separate account investment management fees	6			4			1
	Total life insurance	204			193			179
	Investments
	Investment income, net of expenses	549			529			531
	Realized investment gains, net	133			83			42
	Total investment revenue	682			612			573
	Other	8			9			9
	Total revenues	$	4,945		$	4,531		$	4,111
	Income (loss) before income taxes:
	Insurance underwriting results:
	Commercial lines insurance	$	146		$	186		$	181
	Personal lines insurance	10			33			(43		)
	Excess and surplus lines insurance	30			14			(1		)
	Life insurance	(5		)	9			(3		)
	Investments	599			532			491
	Other	(59		)	(60		)	(59		)
	Total income before income taxes	$	721		$	714		$	566
		December 31,			December 31,
	Identifiable assets:	2014			2013
	Property casualty insurance	$	2,656		$	2,455
	Life insurance	1,316			1,225
	Investments	14,441			13,618
	Other	340			364
	Total	$	18,753		$	17,662

Quarterly_Supplementary_Data_T

Quarterly Supplementary Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Information	This table includes unaudited quarterly financial information for the years ended December 31, 2014 and 2013:
	(Dollars in millions except per share data)	Quarter
		1st		2nd		3rd		4th		Full year
	2014
	Revenues	$	1,189	$	1,214	$	1,280	$	1,262	$	4,945
	Income before income taxes	119		107		259		236		721
	Net income	91		84		183		167		525
	Net income per common share—basic	0.56		0.51		1.12		1.03		3.21
	Net income per common share—diluted	0.55		0.51		1.11		1.02		3.18
	2013
	Revenues	$	1,103	$	1,104	$	1,152	$	1,172	$	4,531
	Income before income taxes	217		148		182		167		714
	Net income	154		110		131		122		517
	Net income per common share—basic	0.95		0.67		0.8		0.75		3.16
	Net income per common share—diluted	0.94		0.66		0.79		0.74		3.12

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008
	reporting_locations
	subsidiary
	state
	independent_insurance_agency
Significant Accounting Policies
Number of operating subsidaries	2
Number of independent insurance agencies	1,466
Number of reporting locations	1,884
Number of states in which entity operates	39
Defined Benefit Plan Qualifying Age				40 years
Current fair value of the BOLI invested assets and cash exceeded the current fair value of the contract holders' account value	$47
Other invested assets	68	68
Depreciation expense	37	37	37
Land, building and equipment impairments	0	0	0
Minimum
Significant Accounting Policies
Estimated useful lives	3 years
Maximum
Significant Accounting Policies
Estimated useful lives	39 years 6 months
Life Policy Loans
Significant Accounting Policies
Other invested assets	31
Venture Capital Funds
Significant Accounting Policies
Other invested assets	$37
10 Largest States
Significant Accounting Policies
Generated percentage of total earned premiums	62.80%	63.80%
Ohio, Largest State
Significant Accounting Policies
Generated percentage of total earned premiums	17.70%	18.50%
Indiana, Illinois, Pennsylvania, Georgia, Michigan and North Carolina | Minimum
Significant Accounting Policies
Generated percentage of total earned premiums	5.00%
Indiana, Illinois, Pennsylvania, Georgia, Michigan and North Carolina | Maximum
Significant Accounting Policies
Generated percentage of total earned premiums	8.00%
Largest Single Agency Relationship
Significant Accounting Policies
Generated percentage of total earned premiums	0.80%
All Other | Maximum
Significant Accounting Policies
Generated percentage of total earned premiums	2.10%
Stock Options
Significant Accounting Policies
Awards vesting period	3 years
Weighted-average remaining contractual life for options expected to vest	10 years
Restricted Stock Units
Significant Accounting Policies
Awards vesting period	3 years
Property Casualty Insurance Segment
Significant Accounting Policies
Number of operating subsidaries	2

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Gain (Loss) on Investments
Largest equity holdings to total equity portfolio	3.30%
Largest equity holdings to total portfolio	1.10%
Investments, deposit with various states	$75	$80
Investments in fair value, deposit with various states	15,067	14,192
Impaired securities	6	7	13
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss	10	5	1
Fixed Maturities
Gain (Loss) on Investments
Number of securities total unrealized loss in an unrealized loss position for 12 months or more	144	40	4
Equity Securities
Gain (Loss) on Investments
Number of securities total unrealized loss in an unrealized loss position for 12 months or more	3	0	0
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss	1
Exxon Mobil Corporation, The Procter & Gamble Company, Honeywell International Inc, BlackRock Inc., Genuine Parts Company, RPM International, and Johnson and Johnson [Member]
Gain (Loss) on Investments
Available-for-sale securities, accumulated net gain position	619
Seven Primary Contributors
Gain (Loss) on Investments
Number of securities	7
On Deposit With Various States
Gain (Loss) on Investments
Investments in fair value, deposit with various states	$78	$84

Investments_Analysis_Of_Cost_O

Investments (Analysis Of Cost Or Amortized Cost Gross Unrealized Gains And Losses And Fair Value For Investments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fixed Maturities
Schedule of Available-for-sale Securities
Cost or amortized cost	$8,871	$8,638
Gross unrealized gains	607	558
Gross unrealized losses	18	75
Fair value	9,460	9,121
Fixed Maturities | Corporate Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	5,117	5,122
Gross unrealized gains	420	433
Gross unrealized losses	11	22
Fair value	5,526	5,533
Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Cost or amortized cost	3,267	3,107
Gross unrealized gains	178	125
Gross unrealized losses	2	21
Fair value	3,443	3,211
Fixed Maturities | Commercial Mortgage Backed Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	250	148
Gross unrealized gains	9	0
Gross unrealized losses	0	5
Fair value	259	143
Fixed Maturities | Government-Sponsored Enterprises
Schedule of Available-for-sale Securities
Cost or amortized cost	213	227
Gross unrealized gains	0	0
Gross unrealized losses	5	27
Fair value	208	200
Fixed Maturities | Foreign Government
Schedule of Available-for-sale Securities
Cost or amortized cost	10	10
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	10	10
Fixed Maturities | Convertibles and Bonds with Warrants Attached
Schedule of Available-for-sale Securities
Cost or amortized cost	7	17
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	7	17
Fixed Maturities | United States Government
Schedule of Available-for-sale Securities
Cost or amortized cost	7	7
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	7	7
Equity Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	2,728	2,523
Gross unrealized gains	2,134	1,856
Gross unrealized losses	4	4
Fair value	4,858	4,375
Equity Securities | Common Equities
Schedule of Available-for-sale Securities
Cost or amortized cost	2,583	2,396
Gross unrealized gains	2,099	1,818
Gross unrealized losses	3	1
Fair value	4,679	4,213
Equity Securities | Nonredeemable Preferred Equities
Schedule of Available-for-sale Securities
Cost or amortized cost	145	127
Gross unrealized gains	35	38
Gross unrealized losses	1	3
Fair value	179	162
Fixed Maturities And Equity Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	11,599	11,161
Gross unrealized gains	2,741	2,414
Gross unrealized losses	22	79
Fair value	$14,318	$13,496

Investments_Fair_Values_And_Un

Investments (Fair Values And Unrealized Losses By Investment Category And By The Duration Of The Securities' Continuous Unrealized Loss Position) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Investments, Unrealized Loss Position
Less than 12 months fair value	$393	$1,516
Less than 12 months unrealized losses	11	74
12 months or more fair value	446	86
12 months or more unrealized losses	11	5
Total fair value	839	1,602
Total unrealized losses	22	79
Fixed Maturities
Investments, Unrealized Loss Position
Less than 12 months fair value	292	1,397
Less than 12 months unrealized losses	8	70
12 months or more fair value	429	86
12 months or more unrealized losses	10	5
Total fair value	721	1,483
Total unrealized losses	18	75
Fixed Maturities | Corporate Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	261	572
Less than 12 months unrealized losses	8	20
12 months or more fair value	90	43
12 months or more unrealized losses	3	2
Total fair value	351	615
Total unrealized losses	11	22
Fixed Maturities | States, Municipalities and Political Subdivisions
Investments, Unrealized Loss Position
Less than 12 months fair value	17	490
Less than 12 months unrealized losses	0	18
12 months or more fair value	135	42
12 months or more unrealized losses	2	3
Total fair value	152	532
Total unrealized losses	2	21
Fixed Maturities | Commercial Mortgage Backed Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	3	125
Less than 12 months unrealized losses	0	5
12 months or more fair value	23	0
12 months or more unrealized losses	0	0
Total fair value	26	125
Total unrealized losses	0	5
Fixed Maturities | Government-Sponsored Enterprises
Investments, Unrealized Loss Position
Less than 12 months fair value	11	199
Less than 12 months unrealized losses	0	27
12 months or more fair value	181	1
12 months or more unrealized losses	5	0
Total fair value	192	200
Total unrealized losses	5	27
Fixed Maturities | Foreign Government
Investments, Unrealized Loss Position
Less than 12 months fair value		10
Less than 12 months unrealized losses		0
12 months or more fair value		0
12 months or more unrealized losses		0
Total fair value		10
Total unrealized losses		0
Fixed Maturities | United States Government
Investments, Unrealized Loss Position
Less than 12 months fair value		1
Less than 12 months unrealized losses		0
12 months or more fair value		0
12 months or more unrealized losses		0
Total fair value		1
Total unrealized losses		0
Equity Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	101	119
Less than 12 months unrealized losses	3	4
12 months or more fair value	17	0
12 months or more unrealized losses	1	0
Total fair value	118	119
Total unrealized losses	4	4
Equity Securities | Common Equities
Investments, Unrealized Loss Position
Less than 12 months fair value	85	77
Less than 12 months unrealized losses	3	1
12 months or more fair value	0	0
12 months or more unrealized losses	0	0
Total fair value	85	77
Total unrealized losses	3	1
Equity Securities | Nonredeemable Preferred Equities
Investments, Unrealized Loss Position
Less than 12 months fair value	16	42
Less than 12 months unrealized losses	0	3
12 months or more fair value	17	0
12 months or more unrealized losses	1	0
Total fair value	33	42
Total unrealized losses	$1	$3

Investments_Contractual_Maturi

Investments (Contractual Maturity Dates For Fixed-Maturity And Short-Term Investments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Amortized cost
Less than 1 year	$502
Years 1 - 5	3,404
Years 5 - 10	3,322
Due after ten years	1,643
Total	8,871	8,638
Fair value
Less than 1 year	509
Years 1 - 5	3,687
Years 5 - 10	3,506
Due after ten years	1,758
Total	$9,460	$9,121
% of fair value
Less than 1 year	5.40%
Years 1 - 5	39.00%
Years 5 - 10	37.00%
Due after ten years	18.60%
Total	100.00%

Investments_Investment_Income_

Investments (Investment Income Realized Investment Gains And Losses And Change In Unrealized Investment Gains And Losses) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment income:
Interest	$417	$413	$420
Dividends	138	122	115
Other	2	3	3
Total	557	538	538
Less investment expenses	8	9	7
Total	549	529	531
Realized investment gains and losses summary:
Other	3	6	2
Total	133	83	42
Change in unrealized investment gains and losses:
Unrealized gains on investments available-for-sale	250	299	251
OCI, portion attributable to Parent	130	202	124
OCI, portion attributable to Parent	370	577	352
Fixed Maturities
Realized investment gains and losses summary:
Gross realized gains	21	15	36
Gross realized losses	-3	0	0
Other-than-temporary impairments	-15	-2	-1
Change in unrealized investment gains and losses:
Unrealized gains on investments available-for-sale	106	-387	176
Equity Securities
Realized investment gains and losses summary:
Gross realized gains	136	64	39
Gross realized losses	0	0	-2
Other-than-temporary impairments	-9	0	-32
Change in unrealized investment gains and losses:
Unrealized gains on investments available-for-sale	278	847	210
Accumulated Net Unrealized Investment Gain (Loss)
Change in unrealized investment gains and losses:
OCI, portion attributable to Parent	134	161	135
OCI, portion attributable to Parent	$250	$299	$251

Fair_Value_Measurements_Narrat

Fair Value Measurements (Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Principal amount of debt	$793	$793
Recorded outstanding principal and interest for these life policy loans	75	85
Reserves for structured settlements	4,485	4,311
Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Percentage of Level 3 assets measured at fair value	1.00%	1.00%
Life Policy Loans
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Recorded outstanding principal and interest for these life policy loans	31	36
Deferred Annuities and Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Recorded reserves for the deferred annuities	863	862
Reserves for structured settlements	$182	$189

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	$9,460	$9,121
Available for sale securities, equity securities	4,858	4,375
Separate accounts taxable fixed maturities	752	692
Total	15,067	14,192
Top Hat Savings Plan - Mutual Funds and Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Top Hat Savings Plan - mutual funds and common equities (included in Other assets)	18	14
Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	9,460	9,121
Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	5,526	5,533
Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	3,443	3,211
Fixed Maturities | Commercial Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	259	143
Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	208	200
Fixed Maturities | Foreign Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	10	10
Fixed Maturities | Convertibles and Bonds with Warrants Attached
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	7	17
Fixed Maturities | United States Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	7	7
Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	4,679	4,213
Equity Securities | Nonredeemable Preferred Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	179	162
Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	731	682
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Total	4,704	4,234
Level 1 | Top Hat Savings Plan - Mutual Funds and Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Top Hat Savings Plan - mutual funds and common equities (included in Other assets)	18	14
Level 1 | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	7	7
Level 1 | Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | Commercial Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | Foreign Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | Convertibles and Bonds with Warrants Attached
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | United States Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	7	7
Level 1 | Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	4,679	4,213
Level 1 | Equity Securities | Nonredeemable Preferred Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	0	0
Level 1 | Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities		53
Total	10,343	9,954
Level 2 | Top Hat Savings Plan - Mutual Funds and Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Top Hat Savings Plan - mutual funds and common equities (included in Other assets)	0	0
Level 2 | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	9,435	9,112
Level 2 | Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	5,508	5,531
Level 2 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	3,443	3,211
Level 2 | Fixed Maturities | Commercial Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	259	143
Level 2 | Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	208	200
Level 2 | Fixed Maturities | Foreign Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	10	10
Level 2 | Fixed Maturities | Convertibles and Bonds with Warrants Attached
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	7	17
Level 2 | Fixed Maturities | United States Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 2 | Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	0	0
Level 2 | Equity Securities | Nonredeemable Preferred Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	177	160
Level 2 | Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	731	682
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities		0
Total	20	4
Level 3 | Top Hat Savings Plan - Mutual Funds and Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Top Hat Savings Plan - mutual funds and common equities (included in Other assets)	0	0
Level 3 | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	18	2
Level 3 | Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	18	2
Level 3 | Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | Commercial Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | Foreign Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | Convertibles and Bonds with Warrants Attached
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | United States Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	0	0
Level 3 | Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	0	0
Level 3 | Equity Securities | Nonredeemable Preferred Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	2	2
Level 3 | Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	$0	$0

Fair_Value_Measurements_Asset_

Fair Value Measurements (Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	$4	$5
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	1
Sales	0	-1
Transfers into Level 3	16	0
Transfers out of Level 3	0	-1
Ending balance	20	4
Corporate Fixed Maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	2	3
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	0
Transfers into Level 3	16	0
Transfers out of Level 3	0	-1
Ending balance	18	2
States, Municipalities and Political Subdivisions Fixed Maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	0	1
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	0
Sales	0	-1
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	0	0
Nonredeemable Preferred Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	2	1
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	0	1
Sales	0	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$2	$2

Fair_Value_Measurements_Fair_V1

Fair Value Measurements (Fair Value of Note Payable and Long-Term Debt) (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of note payable	$49	$104
Total	1,028	991
6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	34	30
Interest rate	6.90%	6.90%
Debt instrument, year of maturity	2028	2028
6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	496	458
Interest rate	6.92%	6.92%
Debt instrument, year of maturity	2028	2028
6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	449	399
Interest rate	6.13%	6.13%
Debt instrument, year of maturity	2034	2034
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of note payable	0	0
Total	0	0
Level 1 | 6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	0	0
Level 1 | 6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	0	0
Level 1 | 6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of note payable	49	104
Total	1,028	991
Level 2 | 6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	34	30
Level 2 | 6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	496	458
Level 2 | 6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	449	399
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of note payable	0	0
Total	0	0
Level 3 | 6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	0	0
Level 3 | 6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	0	0
Level 3 | 6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	$0	$0

Fair_Value_Measurements_Fair_V2

Fair Value Measurements (Fair Value of Life Policy) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of life policy loans	$39	$45
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of life policy loans	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of life policy loans	0	0
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of life policy loans	$39	$45

Fair_Value_Measurements_Fair_V3

Fair Value Measurements (Fair Value Of Deferred Annuities, Structured Settlements And Other Items) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	$1,114	$1,130
Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	897	911
Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	217	219
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	0	0
Level 1 | Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	0	0
Level 1 | Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	0	0
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	217	219
Level 2 | Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	0	0
Level 2 | Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	217	219
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	897	911
Level 3 | Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	897	911
Level 3 | Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	$0	$0

Property_Casualty_Loss_And_Los2

Property Casualty Loss And Loss Expenses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	$4,438,000,000	$4,241,000,000	$4,169,000,000	$4,280,000,000
Prior year claims and claims adjustment expense	-98,000,000	-147,000,000	-396,000,000
Increase in favorable reserve developement on prior accident	49,000,000	249,000,000
Net loss and loss expense reserves for asbestos and environmental claims	81,000,000	77,000,000
Environmental claims related to mold	51,000,000	51,000,000
Percentage of reserves for asbestos and environmental claims	2.00%	1.90%
Maximum
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reinsurance retention	500,000
Certain Accident, Life and Health Lines
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	47,000,000	70,000,000	61,000,000
Commercial Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	-57,000,000	-95,000,000	-292,000,000
Commercial Insurance | Workers' Compensation Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	-51,000,000	-14,000,000	-74,000,000
Commercial Insurance | Commercial Property Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	-34,000,000	-22,000,000
Commercial Insurance | Homeowner Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	-14,000,000	-19,000,000	-52,000,000
Commercial Insurance | Commercial Casualty Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	5,000,000	-70,000,000	-177,000,000
Commercial Insurance | Commercial Auto Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	39,000,000
Personal Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	-12,000,000	-39,000,000	-99,000,000
Excess and Surplus Lines Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense	($29,000,000)	($13,000,000)	($5,000,000)

Property_Casualty_Loss_And_Los3

Property Casualty Loss And Loss Expenses (Consolidated Property Casualty Loss And Loss Expense Reserves) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Insurance [Abstract]
Gross loss and loss expense reserves, January 1	$4,241	$4,169	$4,280
Less reinsurance recoverable	299	356	375
Net loss and loss expense reserves, January 1	3,942	3,813	3,905
Net incurred loss and loss expenses related to:
Current accident year	2,725	2,448	2,533
Prior accident years	-98	-147	-396
Total incurred	2,627	2,301	2,137
Net paid loss and loss expenses related to:
Current accident year	1,212	1,045	1,123
Prior accident years	1,201	1,127	1,106
Total paid	2,413	2,172	2,229
Net loss and loss expense reserves, December 31	4,156	3,942	3,813
Plus reinsurance recoverable	282	299	356
Gross loss and loss expense reserves, December 31	$4,438	$4,241	$4,169

Life_Policy_And_Investment_Con2

Life Policy And Investment Contract Reservess (Reserve In Addition To The Account Balance Based On Expected No-Lapse Guarantee Benefits And Expected Policy Assessments) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$2,497	$2,390
Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	875	815
Deferred Annuities
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	863	862
Universal Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	530	508
Structured Settlements
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	182	189
Other
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$47	$16

Deferred_Policy_Acquisition_Co2

Deferred Policy Acquisition Costs (Deferred Policy Acquisition Costs And Asset Reconciliation Including The Amortized Deferred Policy Acquisition Costs) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	$565	$470	$477
Capitalized deferred policy acquisition costs	827	802	734
Amortized deferred policy acquisition costs	-807	-758	-706
Amortized shadow deferred policy acquisition costs	-7	51	-35
Deferred policy acquisition costs asset at December 31	$578	$565	$470

Note_Payable_Narrative_Details

Note Payable (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure
Number of lines of credit	1
Aggregate borrowing capacity	225
Accordian feature available amount	50
Line of credit facility, term	5 years
Expiration date of Line of credit	13-May-19
Note payable	49	104
Minimum
Debt Disclosure
Line of credit, interest rate	1.15%	1.30%
Maximum
Debt Disclosure
Line of credit, interest rate	1.30%	1.35%

LongTerm_Debt_And_Capital_Leas2

Long-Term Debt And Capital Lease Obligation (Book Value And Principal Amounts Of Long-Term Debt (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Book value	$791	$790
Principal amount	793	793
6.900% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.90%	6.90%
Debt issuance year	1998
Book value	28	28
Principal amount	28	28
6.920% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.92%	6.92%
Debt issuance year	2005
Book value	391	391
Principal amount	391	391
6.125% Senior Notes, Due 2034
Debt Instrument
Interest rate	6.13%	6.13%
Debt issuance year	2004
Book value	372	371
Principal amount	$374	$374

LongTerm_Debt_And_Capital_Leas3

Long-Term Debt And Capital Lease Obligation (Capital Lease Payments Over Next Five Years) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Long-term Debt and Capital Lease Obligations [Abstract]
2015	$18
2016	9
2017	3
2018	2
2019	3
2020	1
Capital lease obligations	$36	$45

Shareholders_Equity_And_Divide2

Shareholders' Equity And Dividend Restrictions (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shareholders Equity And Dividend Restrictions [Abstract]
Declared cash dividends, per share	$1.76	$1.66	$1.62
Dividends declared by insurance subsidiary to parent	$400	$375	$300
Dividend payment without prior regulatory approval, Minimum percent of policyholder surplus	10.00%
Dividend payment without prior regulatory approval, percent of statutory net income for the prior calendar year	100.00%
Dividends might be paid during 2015	$447

Shareholders_Equity_And_Divide3

Shareholders' Equity And Dividend Restrictions (Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income, Before Tax
Pension obligations OCI	($18)	$83	($13)
Accumulated Other Comprehensive Income, Income Tax
Income taxes on above of other comprehensive income	130	202	124
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,504
Other comprehensive income before tax	370	577	352
AOCI, balance at the end of the period	1,744	1,504
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	2,335	1,875	1,489
OCI before realized gains (losses) recognized in net income	514	537	426
Realized gains (losses) recognized in net income	-130	-77	-40
OCI, portion attributable to Parent	384	460	386
AOCI, balance at the end of the period	2,719	2,335	1,875
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	808	647	512
OCI before realized gains (losses) recognized in net income	181	188	149
Realized gains (losses) recognized in net income	-47	-27	-14
Income taxes on above of other comprehensive income	134	161	135
AOCI, balance at the end of the period	942	808	647
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,527	1,228	977
OCI before realized gains (losses) recognized in net income	333	349	277
Realized gains (losses) recognized in net income	-83	-50	-26
Other comprehensive income before tax	250	299	251
AOCI, balance at the end of the period	1,777	1,527	1,228
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	-18	-101	-88
OCI before realized gains (losses) recognized in net income	-21	83	-13
Realized gains (losses) recognized in net income	3	0	0
OCI, portion attributable to Parent	-18	83	-13
AOCI, balance at the end of the period	-36	-18	-101
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	-6	-35	-31
OCI before realized gains (losses) recognized in net income	-7	29	-4
Realized gains (losses) recognized in net income	1	0	0
Income taxes on above of other comprehensive income	-6	29	-4
AOCI, balance at the end of the period	-12	-6	-35
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	-12	-66	-57
OCI before realized gains (losses) recognized in net income	-14	54	-9
Realized gains (losses) recognized in net income	2	0	0
Other comprehensive income before tax	-12	54	-9
AOCI, balance at the end of the period	-24	-12	-66
Accumulated Net Unrealized Gain (Loss) on Deferred Costs, Reserves And Other
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	-16	-50	-29
OCI before realized gains (losses) recognized in net income	7	40	-19
Realized gains (losses) recognized in net income	-3	-6	-2
OCI, portion attributable to Parent	4	34	-21
AOCI, balance at the end of the period	-12	-16	-50
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	-5	-17	-10
OCI before realized gains (losses) recognized in net income	3	14	-7
Realized gains (losses) recognized in net income	-1	-2	0
Income taxes on above of other comprehensive income	2	12	-7
AOCI, balance at the end of the period	-3	-5	-17
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	-11	-33	-19
OCI before realized gains (losses) recognized in net income	4	26	-12
Realized gains (losses) recognized in net income	-2	-4	-2
Other comprehensive income before tax	2	22	-14
AOCI, balance at the end of the period	-9	-11	-33
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	2,301	1,724	1,372
Investments OCI	384	460	386
Pension obligations OCI	-18	83	-13
Life deferred acquisition costs, life policy reserves and other OCI	4	34	-21
Total OCI	370	577	352
AOCI, balance at the end of the period	2,671	2,301	1,724
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	797	595	471
Investments OCI	134	161	135
Pension obligations OCI	-6	29	-4
Life deferred acquisition costs, life policy reserves and other OCI	2	12	-7
Total OCI	130	202	124
AOCI, balance at the end of the period	927	797	595
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,504	1,129	901
Investments OCI	250	299	251
Pension obligations OCI	-12	54	-9
Life deferred acquisition costs, life policy reserves and other OCI	2	22	-14
Total OCI	240	375	228
AOCI, balance at the end of the period	$1,744	$1,504	$1,129

Reinsurance_Earned_Consolidate

Reinsurance (Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	$4,468	$4,151	$3,755
Assumed earned premiums	12	11	9
Ceded earned premiums	-237	-260	-242
Property, Liability and Casualty Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	4,209	3,903	3,520
Assumed earned premiums	12	11	9
Ceded earned premiums	-176	-201	-185
Net earned premiums	$4,045	$3,713	$3,344

Reinsurance_Incurred_Consolida

Reinsurance (Incurred Consolidated Property Casualty Insurance Loss And Loss Expenses On Assumed And Ceded Business) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net incurred loss and loss expenses	$2,856	$2,505	$2,322
Property, Liability and Casualty Insurance Product Line [Member]
Direct incurred loss and loss expenses	2,661	2,323	2,235
Assumed incurred loss and loss expenses	6	11	6
Ceded incurred loss and loss expenses	-40	-33	-104
Net incurred loss and loss expenses	$2,627	$2,301	$2,137

Reinsurance_Earned_Life_Insura

Reinsurance (Earned Life Insurance Premiums On Ceded Business) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Direct earned premiums	$4,468	$4,151	$3,755
Ceded earned premiums	-237	-260	-242
Life Insurance Segment
Direct earned premiums	259	248	235
Ceded earned premiums	-61	-59	-57
Net earned premiums	$198	$189	$178

Reinsurance_Life_Insurance_Con

Reinsurance (Life Insurance Contract Holders' Benefits Incurred On Ceded Business) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net incurred loss and loss expenses	$2,856	$2,505	$2,322
Life Insurance Segment
Direct contract holders' benefits incurred	299	266	232
Ceded contract holders' benefits incurred	-70	-62	-47
Net incurred loss and loss expenses	$229	$204	$185

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory rate, percentage	35.00%	35.00%	35.00%
Income taxes paid, net	$1	$1	$11

Income_Taxes_Components_Of_Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deferred tax assets:
Loss and loss expense reserves	$197	$206
Unearned premiums	145	137
Investments	16	19
Other	41	46
Total	399	408
Deferred tax liabilities:
Deferred tax liabilities:	937	807
Deferred acquisition costs	183	178
Life policy reserves	110	86
Other	9	10
Total	1,239	1,081
Net deferred income tax liability	$840	$673

Income_Taxes_Differences_Betwe

Income Taxes (Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at statutory rate:	$252	$250	$198
Tax at statutory rate (percentage):	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	-33	-32	-33
Dividend received exclusion	-29	-26	-24
Other	6	5	4
Total provision for income taxes	$196	$197	$145
Tax at statutory rate:
Tax-exempt income from municipal bonds (percentage)	-4.60%	-4.50%	-5.90%
Dividend received exclusion (percentage)	-4.00%	-3.60%	-4.20%
Other (percentage)	0.80%	0.70%	0.70%
Effective tax, percentage	27.20%	27.60%	25.60%

Net_Income_Per_Common_Share_Ca

Net Income Per Common Share (Calculations For Basic And Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income—basic and diluted	$167	$183	$84	$91	$122	$131	$110	$154	$525	$517	$421
Denominator:
Basic weighted-average common shares outstanding									163.5	163.5	162.5
Diluted weighted-average shares									165.1	165.4	163.7
Earnings per share:
Basic (in usd per share)	$1.03	$1.12	$0.51	$0.56	$0.75	$0.80	$0.67	$0.95	$3.21	$3.16	$2.59
Diluted (in usd per share)	$1.02	$1.11	$0.51	$0.55	$0.74	$0.79	$0.66	$0.94	$3.18	$3.12	$2.57
Number of anti-dilutive stock-based awards									0.7	0.4	5.9
Stock Options
Denominator:
Effect of stock-based awards									1	1.2	0.5
Restricted Stock Units (RSUs)
Denominator:
Effect of stock-based awards									0.6	0.7	0.7

Employee_Retirement_Benefits_N

Employee Retirement Benefits (Narrative) (Details) (USD $)	12 Months Ended					3 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008	Dec. 31, 2015	Mar. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Minimum participant age to elect				40 years
Employer discretionary contribution amount	$11	$10	$9
Requisite service period	3 years
Actual return on plan assets	11.70%	24.00%
Total recognized in net periodic benefit cost and other comprehensive income	-31	63	-31
Amortization of actuarial loss	5
Amortization of prior service cost	1
Pension plan assets at fair value	288	280	238
Cash dividends paid	288	270	263
Domestic Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	81.00%
Domestic Equity Securities | Information Technology Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	19.00%
Domestic Equity Securities | Financial Services Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	23.00%
Domestic Equity Securities | Healthcare Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	14.00%
Domestic Equity Securities | Industrial Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	12.00%
Domestic Equity Securities | All Remaining Sectors
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	10.00%
States, Municipalities and Political Subdivisions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	12.00%
Domestic Corporate Debt Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments	7.00%
Cash and Cash Equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Pension plan assets at fair value	11	19
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Matching contribution to defined contribution plan	6.00%
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Pension plan assets, shares	467,113	467,113
Pension plan assets, fair value	24	24
Shares sold during period		100,000
Pension plan assets, entity's shares sold, gain		5
Cash dividends paid	1	1
Pension Plan | Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate	0.90%
Pension Plan | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate	0.95%
Supplemental Employee Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Accrued employee benefit	13	9
Supplemental Employee Retirement Plan | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Expected contribution by employer during 2015					3
Supplemental Employee Retirement Plan | Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate	0.75%
Supplemental Employee Retirement Plan | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate	0.85%
Top Hat Savings Plan - Mutual Funds and Common Equities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
CFC Top Hat Savings Plan	18	14
Subsequent Event | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Expected contribution by employer during 2015						$5

Employee_Retirement_Benefits_W

Employee Retirement Benefits (Weighted-Average Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Benefit Obligations | Pension Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	4.25%	5.15%
Benefit Obligations | Pension Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%
Benefit Obligations | Pension Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%
Benefit Obligations | Supplemental Employee Retirement Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	4.05%	4.80%
Benefit Obligations | Supplemental Employee Retirement Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%
Benefit Obligations | Supplemental Employee Retirement Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%
Net Periodic Benefit Cost | Pension Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	5.15%	4.20%	5.10%
Expected return on plan assets	7.25%	7.50%	7.50%
Net Periodic Benefit Cost | Pension Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%	3.50%
Net Periodic Benefit Cost | Pension Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%	5.50%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	4.80%	3.95%	4.75%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%	3.50%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%	5.50%

Employee_Retirement_Benefits_B

Employee Retirement Benefits (Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in projected benefit obligation:
Benefit obligation, January 1	$284	$320
Service cost	10	13	12
Interest cost	15	13	14
Actuarial loss (gain)	35	-34
Benefits paid	-27	-28
Other	2	0	0
Projected benefit obligation, December 31	319	284	320
Accumulated benefit obligation	284	257
Change in plan assets:
Fair value of plan assets, January 1	280	238
Actual return on plan assets	30	55
Employer contribution	5	15
Benefits paid	-27	-28
Fair value of plan assets, December 31	288	280	238
Unfunded status:
Funded status, December 31	($31)	($4)

Employee_Retirement_Benefits_R

Employee Retirement Benefits (Reconciliation Of The Funded Status For Qualified Plan And SERP) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Compensation and Retirement Disclosure [Abstract]
Other assets	$0	$4
Other liabilities	-31	-8
Net amount recognized	-31	-4
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss	34	18
Prior service cost	2	0
Total	$36	$18

Employee_Retirement_Benefits_C

Employee Retirement Benefits (Components Of Net Periodic Benefit Cost As Well As Other Changes In Plan Assets And Benefit Obligations Recognized In Other Comprehensive Income For Qualified Plan And SERP) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Service cost	$10	$13	$12
Interest cost	15	13	14
Expected return on plan assets	-17	-17	-16
Amortization of actuarial loss and prior service cost	2	9	8
Other	3	2	0
Net periodic benefit cost	13	20	18
Current year actuarial loss (gain)	21	-72	20
Amortization of actuarial loss	5	10	6
Other	2	0	0
Amortization of prior service cost	0	-1	-1
Total recognized in other comprehensive loss (income)	$18	($83)	$13

Employee_Retirement_Benefits_F

Employee Retirement Benefits (Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	$9,460	$9,121
Available for sale securities, equity securities	4,858	4,375
Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	52	53
Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	33	32
Fixed Maturities | Corporate Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	19	21
Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	277	261
Equity Securities | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	225	208
Level 1 | Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 1 | Fixed Maturities | Corporate Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 1 | Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	225	208
Level 1 | Equity Securities | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	225	208
Level 2
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities		53
Level 2 | Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	52	53
Level 2 | Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	33	32
Level 2 | Fixed Maturities | Corporate Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	19	21
Level 2 | Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	52
Level 2 | Equity Securities | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	0	0
Level 3
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities		0
Level 3 | Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 3 | Fixed Maturities | Corporate Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	0	0
Level 3 | Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	0
Level 3 | Equity Securities | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	$0	$0

Employee_Retirement_Benefits_E

Employee Retirement Benefits (Expected Future Benefit Payments For Qualified Plan And SERP) (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Compensation and Retirement Disclosure [Abstract]
Expected future benefit payments, 2015	$26
Expected future benefit payments, 2016	32
Expected future benefit payments, 2017	29
Expected future benefit payments, 2018	23
Expected future benefit payments, 2019	24
Expected future benefit payments, 2020 - 2024	$142

Statutory_Accounting_Informati2

Statutory Accounting Information (Schedule Of Statutory Net Income And Statutory Surplus (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
The Cincinnati Insurance Company
Statutory Accounting Practices
SAP net income (loss)	$436	$418	$334
Capital and surplus	4,472	4,326
The Cincinnati Casualty Company
Statutory Accounting Practices
SAP net income (loss)	12	10	10
Capital and surplus	330	317
The Cincinnati Indemnity Company
Statutory Accounting Practices
SAP net income (loss)	3	2	2
Capital and surplus	86	82
The Cincinnati Specialty Underwriters Insurance Company
Statutory Accounting Practices
SAP net income (loss)	32	18	6
Capital and surplus	266	228
The Cincinnati Life Insurance Company
Statutory Accounting Practices
SAP net income (loss)	-19	-20	5
Capital and surplus	$223	$247

Transactions_With_Affliated_Pa

Transactions With Affliated Parties (Narrative) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transaction
Payment for commissions	$7	$6	$5
Earned premiums	4,243	3,902	3,522
Affiliated Parties
Related Party Transaction
Earned premiums	$41	$35	$35

Commitments_And_Contingent_Lia1

Commitments And Contingent Liabilities (Narrative) (Details) (Maximum, USD $)	12 Months Ended
	Dec. 31, 2014
Maximum
Estimate for which the risk of loss is more than remote	$1

ShareBased_Associate_Compensat2

Share-Based Associate Compensation Plans (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award
Maximum number of shares awarded to each full-time employee for their service	10
Share based compensation	$13	$12	$11
Tax benefit from compensation expense	6	6	5
Options exercised, intrinsic value	13	17	6
Options vested, intrinsic value	9	15	5
Unrecognized compensation costs related to non-vested awards	21
Expected weighted-average period to recognize the unrecognized compensation costs related to non-vested awards	1 year 8 months 18 days
Proceeds from stock options exercised	22	25	10
Shares of common stock granted in period	401,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Awards exercise peirod	10 years
Awards vesting period	3 years
Proceeds from stock options exercised	22	25	10
Shares repurchased	378,276	577,745	311,524
Shares repurchased, value	19	28	12
Weighted average remaining contractual term	8 years 4 months 10 days
Weighted-average remaining contractual life for exercisable awards	3 years 4 months 10 days
Shares authorized to be granted under the shareholder-approved plans	17,300,000
Shares available for future issuance under the plans	6,200,000
Stock Options | Directors
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock granted in period	20,760
Restricted Stock Units | Service Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Awards vesting period	3 years
Awards other than options vested, intrinsic value	14	15	1
Restricted Stock Units | Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Awards vesting period	3 years	3 years
Awards other than options vested, intrinsic value	$3	$3	$2
Risk-free rates, minimum	0.00%	0.00%	0.00%
Risk-free rates, maximum	200.00%	200.00%	125.00%
Number of shares issued	59,615
Expected volatility	2.88%	2.87%
Dividend yield	3.74%	3.63%
Risk-free rates	0.66%	0.40%

ShareBased_Associate_Compensat3

Share-Based Associate Compensation Plans(Assumptions Used In Option Grants Issued) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Weighted-average fair value of options granted during the period	$10.16	$9.71	$6.78
Minimum
Weighted-average expected term	8 years	9 years	8 years
Expected volatility	25.20%	25.25%	25.26%
Dividend yield	3.76%	3.65%	4.51%
Risk-free rates	2.42%	1.82%	1.58%
Maximum
Weighted-average expected term	9 years	10 years	10 years
Expected volatility	26.22%	26.31%	26.20%
Dividend yield	3.76%	3.65%	4.52%
Risk-free rates	2.62%	2.00%	2.00%

ShareBased_Associate_Compensat4

Share-Based Associate Compensation Plans (Stock Option Information) (Details) (USD $)	12 Months Ended
In Millions, except Share data in Thousands, unless otherwise specified	Dec. 31, 2014
Shares
Outstanding at beginning of year	6,332
Granted	401
Exercised	-1,086
Forfeited or expired	-689
Outstanding at end of year	4,958
Options exercisable at end of period	4,165
Weighted-average exercise price
Outstanding at beginning of year	$38.39
Granted	$46.81
Exercised	$37.59
Forfeited or expired	$39.49
Outstanding at end of year	$39.10
Options exercisable at end of period	$38.17
Aggregate intrinsic value
Outstanding at end of year	$66
Options exercisable at end of period	$59

ShareBased_Associate_Compensat5

Share-Based Associate Compensation Plans (Options Outstanding And Exercisable) (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Options Outstanding [Abstract]
Shares	4,958	6,332
Weighted-average remaining contractual life	4 years 1 month 30 days
Weighted-average exercise price	$39.10	$38.39
Options Exercisable [Abstract]
Shares	4,165
Weighted-average exercise price	$38.17
Range 1
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of per-share exercise prices, lower limit	$25
Range of per-share exercise prices, upper limit	$29.99
Options Outstanding [Abstract]
Shares	731
Weighted-average remaining contractual life	4 years 6 months 28 days
Weighted-average exercise price	$26.58
Options Exercisable [Abstract]
Shares	731
Weighted-average exercise price	$26.58
Range 2
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of per-share exercise prices, lower limit	$30
Range of per-share exercise prices, upper limit	$34.99
Options Outstanding [Abstract]
Shares	675
Weighted-average remaining contractual life	6 years 5 days
Weighted-average exercise price	$33.96
Options Exercisable [Abstract]
Shares	675
Weighted-average exercise price	$33.96
Range 3
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of per-share exercise prices, lower limit	$35
Range of per-share exercise prices, upper limit	$39.99
Options Outstanding [Abstract]
Shares	981
Weighted-average remaining contractual life	4 years 10 months 24 days
Weighted-average exercise price	$37.31
Options Exercisable [Abstract]
Shares	824
Weighted-average exercise price	$37.63
Range 4
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of per-share exercise prices, lower limit	$40
Range of per-share exercise prices, upper limit	$44.99
Options Outstanding [Abstract]
Shares	1,258
Weighted-average remaining contractual life	3 years 1 month 2 days
Weighted-average exercise price	$43.58
Options Exercisable [Abstract]
Shares	1,015
Weighted-average exercise price	$43.32
Range 5
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range
Range of per-share exercise prices, lower limit	$45
Range of per-share exercise prices, upper limit	$49.99
Options Outstanding [Abstract]
Shares	1,313
Weighted-average remaining contractual life	3 years 6 months 1 day
Weighted-average exercise price	$45.73
Options Exercisable [Abstract]
Shares	920
Weighted-average exercise price	$45.26

ShareBased_Associate_Compensat6

Share-Based Associate Compensation Plans (Restricted Stock Unit Information) (Details) (Restricted Stock Units, USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Service Based Shares
Nonvested shares
Beginning balance	936
Granted	331
Vested	-271
Forfeited or canceled	-28
Ending balance	968
Weighted-average grant-date fair value
Beginning balance	$33.61
Granted	$41.84
Vested	$29.79
Forfeited or canceled	$36.28
Ending balance	$37.42
Performance Based Shares
Nonvested shares
Beginning balance	246
Granted	99
Vested	-60
Forfeited or canceled	-2
Ending balance	283
Weighted-average grant-date fair value
Beginning balance	$37.66
Granted	$36.03
Vested	$30.91
Forfeited or canceled	$31.77
Ending balance	$38.55

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
									industry
									segment
Segment Reporting Information
Earned premiums									$4,243	$3,902	$3,522
Revenues	1,262	1,280	1,214	1,189	1,172	1,152	1,104	1,103	4,945	4,531	4,111
Other Income									8	9	10
Fees and Commissions									12	8	6
Net Investment Income									549	529	531
Realized investment gains, net									133	83	42
Income before income taxes	236	259	107	119	167	182	148	217	721	714	566
Identifiable assets	18,753				17,662				18,753	17,662
Number of Industries Operated In									2
Number of Insurance Segments									4
Life Insurance Segment
Segment Reporting Information
Earned premiums									198	189	178
Identifiable assets	1,316				1,225				1,316	1,225
Investments Segment
Segment Reporting Information
Identifiable assets	14,441				13,618				14,441	13,618
Consolidated Property and Casualty Insurance Entity
Segment Reporting Information
Identifiable assets	2,656				2,455				2,656	2,455
Corporate and Other Non-Segment
Segment Reporting Information
Other Income									8	9	9
Income before income taxes									-59	-60	-59
Identifiable assets	340				364				340	364
Operating Segments | Commercial Insurance
Segment Reporting Information
Earned premiums									2,856	2,636	2,383
Revenues									2,860	2,639	2,387
Fees and Commissions									4	3	4
Income before income taxes									146	186	181
Operating Segments | Commercial Insurance | Commercial Casualty Line
Segment Reporting Information
Earned premiums									938	856	767
Operating Segments | Commercial Insurance | Commercial Property Line
Segment Reporting Information
Earned premiums									728	623	545
Operating Segments | Commercial Insurance | Commercial Auto Line
Segment Reporting Information
Earned premiums									528	479	426
Operating Segments | Commercial Insurance | Workers' Compensation Line
Segment Reporting Information
Earned premiums									370	365	344
Operating Segments | Commercial Insurance | Other Commercial Lines
Segment Reporting Information
Earned premiums									292	313	301
Operating Segments | Personal Insurance
Segment Reporting Information
Earned premiums									1,041	961	868
Revenues									1,043	962	870
Fees and Commissions									2	1	2
Income before income taxes									10	33	-43
Operating Segments | Personal Insurance | Personal Auto
Segment Reporting Information
Earned premiums									476	443	404
Operating Segments | Personal Insurance | Home Owner Line
Segment Reporting Information
Earned premiums									443	403	353
Operating Segments | Personal Insurance | Other Personal Lines
Segment Reporting Information
Earned premiums									122	115	111
Operating Segments | Excess and Surplus Lines Insurance
Segment Reporting Information
Earned premiums									148	116	93
Income before income taxes									30	14	-1
Operating Segments | Life Insurance Segment
Segment Reporting Information
Earned premiums									198	189	178
Revenues									204	193	179
Fees and Commissions									6	4	1
Income before income taxes									-5	9	-3
Operating Segments | Investments Segment
Segment Reporting Information
Revenues									682	612	573
Net Investment Income									549	529	531
Realized investment gains, net									133	83	42
Income before income taxes									$599	$532	$491

Quarterly_Supplementary_Data_D

Quarterly Supplementary Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$1,262	$1,280	$1,214	$1,189	$1,172	$1,152	$1,104	$1,103	$4,945	$4,531	$4,111
Income before income taxes	236	259	107	119	167	182	148	217	721	714	566
Net Income (Loss) Attributable to Parent	$167	$183	$84	$91	$122	$131	$110	$154	$525	$517	$421
Basic (in usd per share)	$1.03	$1.12	$0.51	$0.56	$0.75	$0.80	$0.67	$0.95	$3.21	$3.16	$2.59
Diluted (in usd per share)	$1.02	$1.11	$0.51	$0.55	$0.74	$0.79	$0.66	$0.94	$3.18	$3.12	$2.57

Recovered_Sheet3

Summary of Investments Other Than Investments In Related Parties (Details)1 (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	$11,667
Fair value		0
Balance sheet	14,386
Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	8,871
Fair value	9,460
Balance sheet	9,460
Equity Securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,728
Fair value	4,858
Balance sheet	4,858
Other than Securities Investment
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	68
Fair value		0
Balance sheet	68
States, Municipalities and Political Subdivisions | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	3,267
Fair value	3,443
Balance sheet	3,443
States, Municipalities and Political Subdivisions | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,634
Fair value	2,759
Balance sheet	2,759
States, Municipalities and Political Subdivisions | Fixed Maturities | The Cincinnati Casualty Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	136
Fair value	143
Balance sheet	143
States, Municipalities and Political Subdivisions | Fixed Maturities | The Cincinnati Indemnity Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	39
Fair value	41
Balance sheet	41
States, Municipalities and Political Subdivisions | Fixed Maturities | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	187
Fair value	213
Balance sheet	213
States, Municipalities and Political Subdivisions | Fixed Maturities | The Cincinnati Specialty Underwriters Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	270
Fair value	286
Balance sheet	286
States, Municipalities and Political Subdivisions | Fixed Maturities | CSU Producers Resources Inc.
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1
Fair value	1
Balance sheet	1
Convertibles and Bonds with Warrants Attached | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	7
Fair value	7
Balance sheet	7
Convertibles and Bonds with Warrants Attached | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	7
Fair value	7
Balance sheet	7
United States Government | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	7
Fair value	7
Balance sheet	7
United States Government | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1
Fair value	1
Balance sheet	1
United States Government | Fixed Maturities | The Cincinnati Casualty Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2
Fair value	2
Balance sheet	2
United States Government | Fixed Maturities | The Cincinnati Indemnity Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1
Fair value	1
Balance sheet	1
United States Government | Fixed Maturities | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	3
Fair value	3
Balance sheet	3
Government-Sponsored Enterprises | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	213
Fair value	208
Balance sheet	208
Government-Sponsored Enterprises | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	4
Fair value	4
Balance sheet	4
Government-Sponsored Enterprises | Fixed Maturities | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	209
Fair value	204
Balance sheet	204
Foreign Government | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	10
Fair value	10
Balance sheet	10
Foreign Government | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	10
Fair value	10
Balance sheet	10
Common Stock | Equity Securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,583
Fair value	4,679
Balance sheet	4,679
Common Stock | Equity Securities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1,462
Fair value	2,831
Balance sheet	2,831
Common Stock | Equity Securities | The Cincinnati Casualty Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	45
Fair value	91
Balance sheet	91
Common Stock | Equity Securities | The Cincinnati Indemnity Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	12
Fair value	22
Balance sheet	22
Common Stock | Equity Securities | The Cincinnati Specialty Underwriters Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	51
Fair value	85
Balance sheet	85
Common Stock | Equity Securities | CSU Producers Resources Inc.
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	9
Fair value	11
Balance sheet	11
Common Stock | Equity Securities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1,004
Fair value	1,639
Balance sheet	1,639
Nonredeemable Preferred Stock | Equity Securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	145
Fair value	179
Balance sheet	179
Nonredeemable Preferred Stock | Equity Securities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	137
Fair value	167
Balance sheet	167
Nonredeemable Preferred Stock | Equity Securities | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	5
Fair value	8
Balance sheet	8
Nonredeemable Preferred Stock | Equity Securities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	3
Fair value	4
Balance sheet	4
All Other Corporate Bonds | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	5,367
Fair value	5,785
Balance sheet	5,785
All Other Corporate Bonds | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,507
Fair value	2,706
Balance sheet	2,706
All Other Corporate Bonds | Fixed Maturities | The Cincinnati Casualty Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	110
Fair value	118
Balance sheet	118
All Other Corporate Bonds | Fixed Maturities | The Cincinnati Indemnity Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	21
Fair value	23
Balance sheet	23
All Other Corporate Bonds | Fixed Maturities | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,517
Fair value	2,706
Balance sheet	2,706
All Other Corporate Bonds | Fixed Maturities | The Cincinnati Specialty Underwriters Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	151
Fair value	159
Balance sheet	159
All Other Corporate Bonds | Fixed Maturities | CSU Producers Resources Inc.
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	4
Fair value	4
Balance sheet	4
All Other Corporate Bonds | Fixed Maturities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	57
Fair value	69
Balance sheet	69
Policy Loans | Other than Securities Investment | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	31
Fair value		0
Balance sheet	31
Limited Partnership | Other than Securities Investment | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	37
Fair value		0
Balance sheet	$37

Condensed_Financial_Statements1

Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Investments
Fixed maturities, at fair value	$9,460	$9,121
Equity securities, at fair value	4,858	4,375
Other invested assets	68	68
Total investments	14,386	13,564
Cash and cash equivalents	591	433	487	438
Investment income receivable	123	121
Land, building and equipment, net, for company use (accumulated depreciation: 2014—$112; 2013—$106)	194	210
Other assets	75	73
Total assets	18,753	17,662
Liabilities
Deferred federal income tax	840	673
Long-term debt	791	790
Other liabilities	648	611
Total liabilities	12,180	11,592
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,214	1,191
Retained earnings	4,505	4,268
Accumulated other comprehensive income	1,744	1,504
Treasury stock at cost	-1,287	-1,290
Total shareholders' equity	6,573	6,070	5,453	5,033
Total liabilities and shareholders' equity	18,753	17,662
Cincinnati Financial Corporation
Investments
Fixed maturities, at fair value	69	75
Equity securities, at fair value	1,643	1,366
Other invested assets	37	32
Total investments	1,749	1,473
Cash and cash equivalents	72	91	90	20
Equity in net assets of subsidiaries	5,627	5,351
Investment income receivable	6	5
Land, building and equipment, net, for company use (accumulated depreciation: 2014—$112; 2013—$106)	144	148
Prepaid income tax	0	2
Other assets	23	24
Due from subsidiaries	107	114
Total assets	7,728	7,208
Liabilities
Dividends declared but unpaid	72	68
Deferred federal income tax	216	185
Long-term debt	791	790
Other liabilities	76	95
Total liabilities	1,155	1,138
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,214	1,191
Retained earnings	4,505	4,268
Accumulated other comprehensive income	1,744	1,504
Treasury stock at cost	-1,287	-1,290
Total shareholders' equity	6,573	6,070
Total liabilities and shareholders' equity	$7,728	$7,208

Condensed_Financial_Statements2

Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Investment income, net of expenses									$549	$529	$531
Realized investment gains, net									133	83	42
Other revenues									8	9	10
Total revenues	1,262	1,280	1,214	1,189	1,172	1,152	1,104	1,103	4,945	4,531	4,111
Expenses
Interest expense									53	54	54
Other expenses									14	15	14
Total expenses									4,224	3,817	3,545
Income (Loss) Before Income Taxes and Earnings of Subsidiaries	236	259	107	119	167	182	148	217	721	714	566
Benefit for income taxes									196	197	145
Net Income	167	183	84	91	122	131	110	154	525	517	421
Cincinnati Financial Corporation
Revenues
Investment income, net of expenses									46	41	42
Realized investment gains, net									34	21	34
Other revenues									16	15	15
Total revenues									96	77	91
Expenses
Interest expense									52	53	53
Other expenses									28	29	27
Total expenses									80	82	80
Income (Loss) Before Income Taxes and Earnings of Subsidiaries									16	-5	11
Benefit for income taxes									-5	-11	-4
Net Income Before Earnings of Subsidiaries									21	6	15
Increase in equity of subsidiaries									504	511	406
Net Income									$525	$517	$421

Condensed_Financial_Statements3

Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Parenthetical) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Condensed Financial Statements, Captions
Land, building and equipment, accumulated depreciation	$446	$420
Cincinnati Financial Corporation
Condensed Financial Statements, Captions
Land, building and equipment, accumulated depreciation	$112	$106

Condensed_Financial_Statements4

Condensed Financial Statements Of Parent Company Condensed Statements Of Comprehensive Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions
Net Income	$167	$183	$84	$91	$122	$131	$110	$154	$525	$517	$421
Unrealized gains on investments available-for-sale									250	299	251
Unrealized gains on investments available-for-sale, investments held by subsidiaries and other									388	494	365
Amortization of pension actuarial (loss) gain and prior service cost									-18	83	-13
Other comprehensive income before tax									370	577	352
Income taxes on above of other comprehensive income									130	202	124
Other comprehensive income, net of tax									240	375	228
Comprehensive Income									765	892	649
Cincinnati Financial Corporation
Condensed Financial Statements, Captions
Net Income									525	517	421
Unrealized gains on investments available-for-sale									150	303	67
Unrealized gains on investments held by subsidiaries									367	240	361
Reclassification adjustment for (gains) included in net income									-34	-21	-34
Reclassification adjustment for (gains) included in net income on subsidiaries									-99	-62	-8
Unrealized gains (losses) on other									7	-1	5
Unrealized (losses) gains on other subsidiaries									($3)	$35	($26)

Condensed_Financial_Statements5

Condensed Financial Statements Of Parent Company Condensed Statements Of Cash Flows (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows From Operating Activities
Net Income	$525	$517	$421
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	51	50	44
Realized investment gains, net	-133	-83	-42
Changes in:
Investment income receivable	-2	-6	4
Current income tax receivable/payable	2	-49	79
Other assets	19	-32	-4
Other liabilities	-11	77	78
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 buildings and equipment, net	-9	-7	-6
Change in other invested assets, net	9	5	5
Net cash (used) provided by investing activities	-311	-509	-304
Cash Flows From Financing Activities
Payments on note payable	-55	0	0
Payment of cash dividends to shareholders	-278	-263	-256
Purchase of treasury shares	-21	-52	0
Proceeds from stock options exercised	22	25	10
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
Cincinnati Financial Corporation
Cash Flows From Operating Activities
Net Income	525	517	421
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7	7	7
Realized investment gains, net	-34	-21	-34
Dividends from subsidiaries	400	378	300
Changes in:
Increase in equity of subsidiaries	-504	-511	-406
Investment income receivable	-1	-2	1
Current federal income taxes	3	12	-24
Current income tax receivable/payable	-6	-6	18
Other assets	20	-30	-2
Other liabilities	-14	39	7
Intercompany receivable for operations	22	-39	0
Net cash provided by operating activities	418	344	288
Cash Flows From Investing Activities
Sale of fixed maturities	0	0	114
Call or maturity of fixed maturities	4	23	13
Sale of equity securities	112	75	111
Purchase of fixed maturities	0	0	-1
Purchase of equity securities	-225	-179	-212
Investment in buildings and equipment, net	-2	-1	-1
Change in other invested assets, net	4	4	4
Return of capital from subsidiaries	0	22	0
Net cash (used) provided by investing activities	-107	-56	28
Cash Flows From Financing Activities
Payments on note payable	-55	0	0
Payment of cash dividends to shareholders	-278	-263	-256
Purchase of treasury shares	-21	-52	0
Proceeds from stock options exercised	22	25	9
Net transfers to subsidiaries	0	0	-2
Other	2	3	3
Net cash used in financing activities	-330	-287	-246
Net change in cash and cash equivalents	-19	1	70
Cash and cash equivalents at beginning of year	91	90	20
Cash and cash equivalents at end of year	$72	$91	$90

Supplementary_Insurance_Inform1

Supplementary Insurance Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	$578	$565	$470
Gross future policy benefits, losses, claims and expense losses	6,957	6,682	6,510
Gross unearned premium	2,082	1,976	1,792
Other policy claims and benefits payable	25	19	15
Earned premiums	4,243	3,902	3,522
Investment income, net of expenses	502	488	488
Benefits, claims losses and settlement expense	2,856	2,505	2,322
Amortization of deferred policy acquisition costs	807	758	707
Underwriting, acquisition and insurance expenses	494	485	448
Net written premiums	4,146	3,895	3,485
Commercial Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	257	251	235
Gross future policy benefits, losses, claims and expense losses	3,797	3,667	3,645
Gross unearned premium	1,441	1,372	1,246
Earned premiums	2,856	2,636	2,383
Benefits, claims losses and settlement expense	1,812	1,596	1,420
Amortization of deferred policy acquisition costs	537	514	462
Underwriting, acquisition and insurance expenses	365	343	324
Net written premiums	2,922	2,760	2,459
Personal Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	108	104	93
Gross future policy benefits, losses, claims and expense losses	439	417	398
Gross unearned premium	562	535	490
Earned premiums	1,041	961	868
Benefits, claims losses and settlement expense	740	639	652
Amortization of deferred policy acquisition costs	209	192	183
Underwriting, acquisition and insurance expenses	84	98	78
Net written premiums	1,068	1,005	918
Excess And Surplus Lines Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	14	11	9
Gross future policy benefits, losses, claims and expense losses	202	157	126
Gross unearned premium	78	67	54
Earned premiums	148	116	93
Benefits, claims losses and settlement expense	75	66	65
Amortization of deferred policy acquisition costs	24	21	17
Underwriting, acquisition and insurance expenses	19	15	12
Net written premiums	153	128	105
Property, Liability and Casualty Insurance Product Line [Member]
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	379	366	337
Gross future policy benefits, losses, claims and expense losses	4,438	4,241	4,169
Gross unearned premium	2,081	1,974	1,790
Earned premiums	4,045	3,713	3,344
Investment income, net of expenses	358	348	351
Benefits, claims losses and settlement expense	2,627	2,301	2,137
Amortization of deferred policy acquisition costs	770	727	662
Underwriting, acquisition and insurance expenses	468	456	414
Net written premiums	4,143	3,893	3,482
Accident Health Insurance Segment [Member]
Supplementary Insurance Information, by Segment
Net written premiums	3	2	3
Life Insurance Segment
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	199	199	133
Gross future policy benefits, losses, claims and expense losses	2,519	2,441	2,341
Gross unearned premium	1	2	2
Other policy claims and benefits payable	25	19	15
Earned premiums	198	189	178
Investment income, net of expenses	144	140	137
Benefits, claims losses and settlement expense	229	204	185
Amortization of deferred policy acquisition costs	37	31	45
Underwriting, acquisition and insurance expenses	$26	$29	$34

Reinsurance_Details

Reinsurance (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts, life insurance in force	$88,045	$85,015	$81,467
Gross amounts	4,468	4,151	3,755
Ceded amounts to other companies, life insurance in force	37,689	36,952	36,340
Ceded amounts to other companies	237	260	242
Assumed amounts from other companies, life insurance in force	0	0	0
Assumed amounts from other companies	12	11	9
Net amounts, life insurance in force	50,356	48,063	45,126
Premiums Earned, Net	4,243	3,902	3,522
Percentage of amounts assumed to net, life insurance in force	0.00%	0.00%	0.00%
Percentage of amounts assumed to net	0.50%	0.50%	0.30%
Commercial Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	2,973	2,777	2,524
Ceded amounts to other companies	128	151	149
Assumed amounts from other companies	11	10	8
Premiums Earned, Net	2,856	2,636	2,383
Percentage of amounts assumed to net	0.40%	0.40%	0.30%
Personal Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	1,080	1,002	897
Ceded amounts to other companies	40	42	30
Assumed amounts from other companies	1	1	1
Premiums Earned, Net	1,041	961	868
Percentage of amounts assumed to net	0.10%	0.10%	0.10%
Excess And Surplus Lines Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	156	124	99
Ceded amounts to other companies	8	8	6
Assumed amounts from other companies	0	0	0
Premiums Earned, Net	148	116	93
Percentage of amounts assumed to net	0.00%	0.00%	0.00%
Property, Liability And Casualty Insurance Segment [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	4,209	3,903	3,520
Ceded amounts to other companies	176	201	185
Assumed amounts from other companies	12	11	9
Premiums Earned, Net	4,045	3,713	3,344
Percentage of amounts assumed to net	0.50%	0.50%	0.30%
Life Insurance Segment
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	259	248	235
Ceded amounts to other companies	61	59	57
Assumed amounts from other companies	0	0	0
Premiums Earned, Net	$198	$189	$178
Percentage of amounts assumed to net	0.00%	0.00%	0.00%

Valuation_And_Qualifying_Accou1

Valuation And Qualifying Accounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]
Balance at beginning of year	$2	$2	$2
Additions charged to costs and expenses	2	1	1
Deductions	-1	-1	-1
Balance at end of year	$3	$2	$2

Supplementary_Information_Conc1

Supplementary Information Concerning Property Casualty Insurance Operations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	$379	$366	$337
Reserves for unpaid claims and claim adjustment expenses	4,438	4,241	4,169
Unearned premiums	2,081	1,970	1,790
Earned premiums	4,045	3,713	3,344
Investment income	358	348	351
Loss and loss expenses incurred related to current accident year	2,725	2,448	2,533
Prior year claims and claims adjustment expense	-98	-147	-396
Amortization of deferred policy acquisition cost	770	727	661
Paid loss and loss expenses	2,413	2,172	2,229
Net written premiums	4,143	3,893	3,482
Commercial Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	257	251	235
Reserves for unpaid claims and claim adjustment expenses	3,797	3,667	3,645
Unearned premiums	1,441	1,370	1,246
Earned premiums	2,856	2,636	2,383
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	1,869	1,691	1,712
Prior year claims and claims adjustment expense	-57	-95	-292
Amortization of deferred policy acquisition cost	537	514	461
Paid loss and loss expenses	1,666	1,498	1,546
Net written premiums	2,922	2,760	2,459
Personal Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	108	104	93
Reserves for unpaid claims and claim adjustment expenses	439	417	398
Unearned premiums	562	534	490
Earned premiums	1,041	961	868
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	752	678	751
Prior year claims and claims adjustment expense	-12	-39	-99
Amortization of deferred policy acquisition cost	209	192	183
Paid loss and loss expenses	717	639	659
Net written premiums	1,068	1,005	918
Excess And Surplus Lines Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	14	11	9
Reserves for unpaid claims and claim adjustment expenses	202	157	126
Unearned premiums	78	66	54
Earned premiums	148	116	93
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	104	79	70
Prior year claims and claims adjustment expense	-29	-13	-5
Amortization of deferred policy acquisition cost	24	21	17
Paid loss and loss expenses	30	35	24
Net written premiums	$153	$128	$105