Cincinnati Financial (CINF) 10-K 24 Feb 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 20, 2017	Jun. 30, 2016
Document Documentand Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Entity Registrant Name	CINCINNATI FINANCIAL CORP
Entity Central Index Key	20,286
Current Fiscal Year End Date	--12-31
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		164,717,550
Entity Public Float			$ 11,182,876,682

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments
Fixed maturities, at fair value (amortized cost: 2016—$9,799; 2015—$9,324)	$ 10,085	$ 9,650
Equity securities, at fair value (cost: 2016—$2,995; 2015—$2,938)	5,334	4,706
Other invested assets	81	67
Total investments	15,500	14,423
Cash and cash equivalents	777	544
Investment income receivable	134	129
Finance receivable	51	62
Premiums receivable	1,533	1,431
Reinsurance recoverable	545	542
Prepaid reinsurance premiums	62	54
Deferred policy acquisition costs	637	616
Land, building and equipment, net, for company use (accumulated depreciation: 2016—$237; 2015—$459)	183	185
Other assets	198	154
Separate accounts	766	748
Total assets	20,386	18,888
Insurance reserves
Loss and loss expense reserves	5,085	4,718
Life policy and investment contract reserves	2,671	2,583
Unearned premiums	2,307	2,201
Other liabilities	786	717
Deferred income tax	865	638
Note payable	20	35
Long-term debt and capital lease obligations	826	821
Separate accounts	766	748
Total liabilities	13,326	12,461
Commitments and contingent liabilities (Note 16)	0	0
Shareholders' Equity
Common stock, par value—$2 per share; (authorized: 2016 and 2015—500 million shares; issued: 2016 and 2015—198.3 million shares)	397	397
Paid-in capital	1,252	1,232
Retained earnings	5,037	4,762
Accumulated other comprehensive income	1,693	1,344
Treasury stock at cost (2016—33.9 million shares and 2015—34.4 million shares)	(1,319)	(1,308)
Total shareholders' equity	7,060	6,427
Total liabilities and shareholders' equity	$ 20,386	$ 18,888

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fixed maturities, amortized cost	$ 9,799	$ 9,324
Equity securities, cost	2,995	2,938
Land, building and equipment, accumulated depreciation	$ 237	$ 459
Common stock, par value	$ 2	$ 2
common stock, authorized	500	500
Common stock, issued	198.3	198.3
Common stock, shares outstanding	198.3	198.3
Treasury stock, shares	33.9	34.4

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Earned premiums	$ 4,710	$ 4,480	$ 4,243
Investment income, net of expenses	595	572	549
Realized investment gains, net	124	70	133
Fee revenues	15	13	12
Other revenues	5	7	8
Total revenues	5,449	5,142	4,945
Benefits and Expenses
Insurance losses and contract holders' benefits	3,107	2,808	2,856
Underwriting, acquisition and insurance expenses	1,465	1,387	1,301
Interest expense	53	53	53
Other operating expenses	12	13	14
Total benefits and expenses	4,637	4,261	4,224
Income Before Income Taxes	812	881	721
Provision for Income Taxes
Current	183	231	159
Deferred	38	16	37
Total provision for income taxes	221	247	196
Net Income	$ 591	$ 634	$ 525
Per Common Share
Net income—basic (in usd per share)	$ 3.59	$ 3.87	$ 3.21
Net income—diluted (in usd per share)	$ 3.55	$ 3.83	$ 3.18

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 591	$ 634	$ 525
Other Comprehensive Income
Change in unrealized gains and losses on investments, net of tax of $186, $(220) and $134, respectively	345	(405)	250
Amortization of pension actuarial gains and losses and prior service cost, net of tax of $6, $(2) and $(6), respectively	10	(4)	(12)
Change in life deferred acquisition costs, life policy reserves and other, net of tax of $(4), $4 and $2, respectively	(6)	9	2
Other comprehensive income (loss)	349	(400)	240
Comprehensive Income	$ 940	$ 234	$ 765

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Unrealized gains on investments available-for-sale, net of tax	$ 186	$ (220)	$ 134
Amortization of pension actuarial loss and prior service cost, net of tax	6	(2)	(6)
Change in life deferred acquisition costs, life policy reserves and other, net of tax	$ (4)	$ 4	$ 2

Consolidated Statements Of Shar

Consolidated Statements Of Shareholders' Equity - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock
Beginning Balance at Dec. 31, 2013		$ 397	$ 1,191	$ 4,268	$ 1,504	$ (1,290)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards		0	0			37
Share-based compensation			19
Other			4			6
Net Income	$ 525			525
Dividends declared				(288)
Other comprehensive income (loss)	240				240
Shares acquired - share repurchase authorization						(21)
Shares acquired - share-based compensation plans						(19)
Ending Balance at Dec. 31, 2014	6,573	$ 397	1,214	4,505	1,744	(1,287)
Beginning Balance (in shares) at Dec. 31, 2013		163,100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)		1,300
Shares acquired—share repurchase authorization (in shares)		(500)
Shares acquired - share-based compensation plans (in shares)		(400)
Other (in shares)		200
Ending Balance (in shares) at Dec. 31, 2014		163,700
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards		$ 0	(7)			41
Share-based compensation			20
Other			5			7
Net Income	634			634
Dividends declared				(377)
Other comprehensive income (loss)	(400)				(400)
Shares acquired - share repurchase authorization						(53)
Shares acquired - share-based compensation plans						(16)
Ending Balance at Dec. 31, 2015	$ 6,427	$ 397	1,232	4,762	1,344	(1,308)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)		1,300
Shares acquired—share repurchase authorization (in shares)		(1,000)
Shares acquired - share-based compensation plans (in shares)		(300)
Other (in shares)		200
Ending Balance (in shares) at Dec. 31, 2015	198,300	163,900
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards		$ 0	(8)			36
Share-based compensation			23
Other			5			5
Net Income	$ 591			591
Dividends declared				(316)
Other comprehensive income (loss)	349				349
Shares acquired - share repurchase authorization						(39)
Shares acquired - share-based compensation plans						(13)
Ending Balance at Dec. 31, 2016	$ 7,060	$ 397	$ 1,252	$ 5,037	$ 1,693	$ (1,319)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based awards (in shares)	863	1,000
Shares acquired—share repurchase authorization (in shares)		(500)
Shares acquired - share-based compensation plans (in shares)		(200)
Other (in shares)		200
Ending Balance (in shares) at Dec. 31, 2016	198,300	164,400

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net Income	$ 591	$ 634	$ 525
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48	52	51
Realized investment gains, net	(124)	(70)	(133)
Share-based compensation	23	20	19
Interest credited to contract holders'	48	44	47
Deferred income tax expense	38	16	37
Changes in:
Investment income receivable	(5)	(6)	(2)
Premiums and reinsurance receivable	(113)	(48)	(60)
Deferred policy acquisition costs	(26)	(18)	(20)
Other assets	34	(39)	19
Loss and loss expense reserves	367	233	174
Life policy reserves	102	101	119
Unearned premiums	106	119	106
Other liabilities	49	44	(11)
Current income tax receivable/payable	(35)	(18)	2
Net cash provided by operating activities	1,103	1,064	873
Cash Flows From Investing Activities
Sale of fixed maturities	15	43	26
Call or maturity of fixed maturities	1,511	1,199	1,019
Sale of equity securities	465	342	335
Purchase of fixed maturities	(1,994)	(1,722)	(1,312)
Purchase of equity securities	(439)	(493)	(392)
Investment in finance receivables	(17)	(14)	(18)
Collection of finance receivables	30	30	31
Investment in buildings and equipment, net	(13)	(10)	(9)
Change in other invested assets, net	(14)	1	9
Net cash used in investing activities	(456)	(624)	(311)
Cash Flows From Financing Activities
Payment of cash dividends to shareholders	(306)	(366)	(278)
Shares acquired - share repurchase authorization	(39)	(53)	(21)
Payments of note payable	(15)	(14)	(55)
Proceeds from stock options exercised	21	24	22
Contract holders' funds deposited	95	83	86
Contract holders' funds withdrawn	(155)	(148)	(143)
Excess tax benefits on share-based compensation	5	4	2
Other	(20)	(17)	(17)
Net cash used in financing activities	(414)	(487)	(404)
Net change in cash and cash equivalents	233	(47)	158
Cash and cash equivalents at beginning of year	544	591	433
Cash and cash equivalents at end of year	777	544	591
Supplemental Disclosures of Cash Flow Information
Interest paid	52	52	53
Income taxes paid	213	245	154
Noncash Activities
Conversion of securities	4	3	7
Equipment acquired under capital lease obligations	20	20	12
Cashless exercise of stock options	13	16	19
Other assets and other liabilities	$ 53	$ 27	$ 0

Summary Of Significant Accounti

Summary Of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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 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 1,614 independent insurance agencies with 2,090 reporting locations across 41 states. In 2015, The Cincinnati Insurance Company began our reinsurance assumed operations, Cincinnati Re. 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, 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 the consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the consolidated financial statements and accompanying notes. Our actual results could differ from those estimates. 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 capital and long-term investment horizon, our general intent is to hold fixed-maturity investments until maturity, regardless of short-term fluctuations in fair values. Impairment charges for fixed maturities are recorded for other-than-temporary declines in value if fair value is below amortized cost and, in the asset impairment committee’s judgment, the fair value is not expected to be recouped within a designated recovery period. Our invested asset impairment policy also 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 2016 and 2015 . 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, $23 million of private equity investments and $27 million of real estate through direct property ownership and development projects in the United States for the year ended 2016. 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 is defined 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 the company’s nationally recognized 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 the company’s nationally recognized pricing vendor is less than 1 percent of the fair value of our total investment portfolio. For the purpose of ASC 825 disclosure, we estimate the fair value of our long-term senior notes on market pricing of similar debt instruments that are actively trading. We estimate the fair value of our note payable on the 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, 2016 , to account for nonperformance risk. See Note 3, Fair Value Measurements, for further details. 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. Property Casualty Insurance The consolidated property casualty companies actively write property casualty insurance through independent agencies in 41 states. Our 10 largest states generated 61 percent and 62 percent of total earned premiums in 2016 and 2015 , respectively. Ohio, our largest state, accounted for 17 percent of total earned premiums in 2016 and 2015 . Illinois, Indiana, Georgia, North Carolina, Pennsylvania and Michigan each accounted for between 5 percent and 7 percent of total earned premiums in 2016 . Our largest single agency relationship accounted for less than 1 percent of our total property casualty earned premiums in 2016 . No aggregate agency relationship locations under a single ownership structure accounted for more than 4 percent of our total property casualty earned premiums in 2016 . 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. We assess recoverability of deferred acquisition costs at a 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 estimate is recorded for 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 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. We estimate that we may recover some of our costs through salvage and subrogation. Policyholder Dividends Certain workers’ compensation policies include the possibility of a policyholder earning a return of a portion of 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. 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. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate our deferred acquisition costs 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 policy reserve 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 associated with successfully acquiring 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, 2016 , the current fair value of the BOLI invested assets and cash exceeded the current fair value of the contract holders’ account value by approximately $16 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 During 2015, The Cincinnati Insurance Company expanded in the area of reinsurance assumed. Approximately half of the business written includes treaties that provide coverage for property catastrophe events on a worldwide basis. Treaties are written on a pro rata and excess of loss basis. Premiums are primarily earned on a pro rata basis over the coverage period of the treaty. We also assume risk with limited exposure as a reinsurer for other insurance companies, reinsurers and involuntary state pools. We reduce risk and uncertainty by buying property casualty reinsurance and retrocessional reinsurance as well as life reinsurance. Reinsurance and retrocessional 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. Premiums that we cede are deferred and recorded as earned premiums on a pro rata basis over the terms of the contracts. We estimate loss amounts recoverable from our reinsurers based on the reinsurance policy terms. Historically, our claims with reinsurers have been paid. We establish an insignificant allowance for uncollectible reinsurance. Income Taxes We calculate deferred income tax liabilities and assets using tax rates in effect when temporary differences in the consolidated financial statement income and taxable income are expected to reverse. We recognize deferred income taxes for numerous temporary differences between our taxable income and consolidated 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. 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. 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, internal 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 $30 million for 2016 , $36 million for 2015 and $37 million for 2014 . We review our accumulated depreciation for our building, equipment and software assets and write off fully depreciated assets for obsolesce and nonuse. 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 2016 , 2015 or 2014 . 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 as other revenues over the financing term using the effective interest method in the consolidated statements of income. Finance receivables are reviewed for impairment and are insignificant to our consolidated financial position, results of operations and cash flows. 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. Share-Based Compensation We grant qualified and nonqualified share-based compensation under authorized plans. The stock options generally vest on a graded scale 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 as well as service-based restricted stock units that vest ratably over the three -year vesting term. We also grant performance-based restricted stock units that vest if certain market conditions are attained. In 2016 , 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. Subsequent Events There were no subsequent events requiring adjustment to the consolidated financial statements or disclosure. Adopted Accounting Updates 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 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did 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 may be impacted. The effective date of ASU 2015-02 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did not have a material impact on our company’s consolidated financial position, cash flows or results of operations. ASU 2015-09, Financial Services-Insurance: Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU 2015-09, Financial Services-Insurance: Disclosures About Short-Duration Contracts. ASU 2015-09 requires entities to provide additional disclosures about the liability for loss and loss expense reserves to increase the transparency of significant estimates. ASU 2015-09 also requires entities to disclose information about significant changes in methodologies and assumptions used to calculate the liability for loss and loss expense reserves, including reasons for the change and the effects on the financial statements. ASU 2015-09 also requires entities to disclose a rollforward of the liability of loss and loss expense reserves for annual and interim reporting periods. The effective date of ASU 2015-09 is for annual reporting periods beginning after December 15, 2015, and interim reporting periods beginning after December 15, 2016. The Company adopted this ASU as of December 31, 2016. The ASU did not have a material impact on our company’s financial position, cash flows or results of operations, but the ASU required additional disclosures in Note 4, Property Casualty Loss and Loss Expenses, to these consolidated financial statements and will require additional disclosure to our interim reporting periods in 2017. Pending Accounting Updates ASU 2014-09 Revenue from Contracts with Customers In May 2014, the 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, 2017. 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 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revises the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-02, Leases (Topic 842) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting In March 2016, the FASB issued ASU 2016-07, Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement to retroactively adjust an investment, results of operations, and retained earnings once an investment qualifies for use of the equity method. It requires the equity method investor to add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting without retroactive adjustment. The effective date of ASU 2016-07 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations. ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies and improves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The effective date of ASU 2016-09 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations. ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been ad

Investments

Investments	12 Months Ended
	Dec. 31, 2016
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 amortized cost Gross unrealized Fair At December 31, 2016 gains losses Fixed-maturity securities: Corporate $ 5,555 $ 252 $ 26 $ 5,781 States, municipalities and political subdivisions 3,770 100 42 3,828 Commercial mortgage-backed 282 7 2 287 Government-sponsored enterprises 167 — 3 164 Foreign government 10 — — 10 United States government 10 — — 10 Convertibles and bonds with warrants attached 5 — — 5 Subtotal 9,799 359 73 10,085 Equity securities: Common equities 2,812 2,320 9 5,123 Nonredeemable preferred equities 183 28 — 211 Subtotal 2,995 2,348 9 5,334 Total $ 12,794 $ 2,707 $ 82 $ 15,419 At December 31, 2015 Fixed-maturity securities: Corporate $ 5,294 $ 255 $ 96 $ 5,453 States, municipalities and political subdivisions 3,440 172 1 3,611 Commercial mortgage-backed 287 4 2 289 Government-sponsored enterprises 284 — 6 278 Foreign government 10 — — 10 Convertibles and bonds with warrants attached 5 — — 5 United States government 4 — — 4 Subtotal 9,324 431 105 9,650 Equity securities: Common equities 2,749 1,787 51 4,485 Nonredeemable preferred equities 189 32 — 221 Subtotal 2,938 1,819 51 4,706 Total $ 12,262 $ 2,250 $ 156 $ 14,356 The net unrealized investment gains in our fixed-maturity portfolio at December 31, 2016, are primarily the result of the continued low interest rate environment that increased the fair value of our fixed-maturity portfolio. Our commercial mortgage-backed securities had an average rating of Aa1/AA at December 31, 2016 and 2015 . The seven largest net unrealized investment gains in our common stock portfolio are from JP Morgan Chase & Co. (NYSE:JPM), Exxon Mobil Corporation (NYSE:XOM), Honeywell International Incorporated (NYSE:HON), BlackRock Inc. (NYSE:BLK), Microsoft Corporation (Nasdaq:MFST), Johnson and Johnson (NYSE:JNJ), and The Procter & Gamble Company (NYSE:PG), which had a combined gross unrealized gain of $698 million . At December 31, 2016 , JP Morgan Chase & Co. was our largest single equity holding with a fair value of 3.8 percent of our publicly traded common equities portfolio and 1.3 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 positions: (Dollars in millions) Less than 12 months 12 months or more Total At December 31, 2016 Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Fixed-maturity securities: Corporate $ 733 $ 15 $ 189 $ 11 $ 922 $ 26 States, municipalities and political subdivisions 989 42 — — 989 42 Commercial mortgage-backed 89 2 2 — 91 2 Government-sponsored enterprises 155 3 — — 155 3 United States government 6 — — — 6 — Subtotal 1,972 62 191 11 2,163 73 Equity securities: Common equities 103 9 — — 103 9 Nonredeemable preferred equities 4 — — — 4 — Subtotal 107 9 — — 107 9 Total $ 2,079 $ 71 $ 191 $ 11 $ 2,270 $ 82 At December 31, 2015 Fixed-maturity securities: Corporate $ 1,099 $ 63 $ 133 $ 33 $ 1,232 $ 96 States, municipalities and political subdivisions 47 1 22 — 69 1 Commercial mortgage-backed 103 2 2 — 105 2 Government-sponsored enterprises 100 2 127 4 227 6 Subtotal 1,349 68 284 37 1,633 105 Equity securities: Common equities 270 51 — — 270 51 Nonredeemable preferred equities 35 — — — 35 — Subtotal 305 51 — — 305 51 Total $ 1,654 $ 119 $ 284 $ 37 $ 1,938 $ 156 Contractual maturity dates for fixed-maturity investments were: (Dollars in millions) Amortized cost Fair value % of fair value At December 31, 2016 Maturity dates: Due in one year or less $ 462 $ 469 4.6 % Due after one year through five years 2,974 3,135 31.1 Due after five years through ten years 3,850 3,941 39.1 Due after ten years 2,513 2,540 25.2 Total $ 9,799 $ 10,085 100.0 % 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, 2016 , fixed-maturity investments with amortized cost of $70 million and fair value of $72 million were on deposit with various states in compliance with regulatory requirements. At December 31, 2015 , fixed-maturity investments with amortized cost of $74 million and fair value of $77 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: (Dollars in millions) Years ended December 31, 2016 2015 2014 Investment income: Interest $ 440 $ 428 $ 417 Dividends 161 150 138 Other 3 3 2 Total 604 581 557 Less investment expenses 9 9 8 Total $ 595 $ 572 $ 549 Realized investment gains and losses: Fixed maturities: Gross realized gains $ 26 $ 18 $ 21 Gross realized losses (1 ) — (3 ) Other-than-temporary impairments (2 ) (18 ) (15 ) Equity securities: Gross realized gains 152 129 136 Gross realized losses (53 ) (26 ) — Other-than-temporary impairments — (34 ) (9 ) Other 2 1 3 Total $ 124 $ 70 $ 133 Change in unrealized investment gains and losses: Fixed maturities $ (40 ) $ (263 ) $ 106 Equity securities 571 (362 ) 278 Less deferred income taxes 186 (220 ) 134 Total $ 345 $ (405 ) $ 250 For the years ended December 31, 2016 , 2015 and 2014 , there were no credit losses on fixed-maturity securities for which a portion of OTTI has been recognized in other comprehensive income. During 2016 , we other-than-temporarily impaired four securities. At December 31, 2016 , 32 fixed-maturity investments with a total unrealized loss of $11 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, 2016 . During 2015 , we other-than-temporarily impaired 20 securities. At December 31, 2015 , 69 fixed-maturity investments with a total unrealized loss of $37 million had been in an unrealized loss position for 12 months or more. Of that total, five 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, 2015 . 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.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
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, 2015 , 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. The technique used for the Level 2 fixed-maturity securities and taxable fixed maturities in separate accounts is the application of market based modeling. The inputs used for all classes of fixed-maturity securities listed in the table below include relevant market information by asset class, trade activity of like securities, marketplace quotes, benchmark yields, spreads off benchmark yields, interest rates, U.S. Treasury or swap curves, yield to maturity and economic events. Specific to commercial mortgage-backed securities, key inputs also include prepayment and default projections based on past performance of the underlying collateral and current market data. 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 market based modeling. 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. • 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 following tables illustrate the fair value hierarchy for those assets measured at fair value on a recurring basis at December 31, 2016 and 2015 . We do not have any liabilities carried at fair value. There were no transfers between Level 1 and Level 2. (Dollars in millions) Quoted prices in active markets for Significant unobservable At December 31, 2016 Significant other observable inputs (Level 2) Total Fixed maturities, available for sale: Corporate $ — $ 5,703 $ 78 $ 5,781 States, municipalities and political subdivisions — 3,828 — 3,828 Commercial mortgage-backed — 287 — 287 Government-sponsored enterprises — 164 — 164 Foreign government — 10 — 10 United States government 10 — — 10 Convertibles and bonds with warrants attached — 5 — 5 Subtotal 10 9,997 78 10,085 Common equities, available for sale 5,123 — — 5,123 Nonredeemable preferred equities, available for sale — 211 — 211 Separate accounts taxable fixed maturities — 750 — 750 Top Hat savings plan mutual funds and common equity (included in Other assets) 24 — — 24 Total $ 5,157 $ 10,958 $ 78 $ 16,193 At December 31, 2015 Fixed maturities, available for sale: Corporate $ — $ 5,402 $ 51 $ 5,453 States, municipalities and political subdivisions — 3,611 — 3,611 Commercial mortgage-backed — 289 — 289 Government-sponsored enterprises — 278 — 278 Foreign government — 10 — 10 Convertibles and bonds with warrants attached — 5 — 5 United States government 4 — — 4 Subtotal 4 9,595 51 9,650 Common equities, available for sale 4,485 — — 4,485 Nonredeemable preferred equities, available for sale — 218 3 221 Separate accounts taxable fixed maturities — 736 1 737 Top Hat savings plan mutual funds and common equity (included in Other assets) 21 — — 21 Total $ 4,510 $ 10,549 $ 55 $ 15,114 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, 2016 and 2015 . 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. 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 2016 and 2015 : (Dollars in millions) Asset fair value measurements using significant unobservable input Corporate fixed maturities Taxable fixed maturities-separate accounts Nonredeemable preferred equities Total Beginning balance, January 1, 2016 $ 51 $ 1 $ 3 $ 55 Total gains or losses (realized/unrealized): Included in net income — — — — Included in other comprehensive income — — (1 ) (1 ) Purchases 57 — — 57 Sales (1 ) — (2 ) (3 ) Transfers into Level 3 13 — — 13 Transfers out of Level 3 (42 ) (1 ) — (43 ) Ending balance, December 31, 2016 $ 78 $ — $ — $ 78 Beginning balance, January 1, 2015 $ 18 $ — $ 2 $ 20 Total gains or losses (realized/unrealized): Included in net income — — — — Included in other comprehensive income — — 1 1 Purchases 36 1 — 37 Sales — — — — Transfers into Level 3 — — — — Transfers out of Level 3 (3 ) — — (3 ) Ending balance, December 31, 2015 $ 51 $ 1 $ 3 $ 55 With the exception of the above table, additional disclosures for the Level 3 category are 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 active markets for Significant other Significant unobservable inputs (Level 3) Total At December 31, 2016 Note payable $ — $ 20 $ — $ 20 6.900% senior debentures, due 2028 — 33 — 33 6.920% senior debentures, due 2028 — 488 — 488 6.125% senior notes, due 2034 — 435 — 435 Total $ — $ 976 $ — $ 976 At December 31, 2015 Note payable $ — $ 35 $ — $ 35 6.900% senior debentures, due 2028 — 31 — 31 6.920% senior debentures, due 2028 — 480 — 480 6.125% senior notes, due 2034 — 425 — 425 Total $ — $ 971 $ — $ 971 Fair value of the note payable was determined based upon the outstanding balance at December 31, 2016 and 2015 , because it is short term and tied to a variable interest rate. 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, 2016 and 2015 . None of the long-term debt is encumbered by rating triggers. The note payable and long-term debt were classified as Level 2 as an active market does not exist, but fair value is determined based on observable inputs. The following table shows the fair value of our life policy loans, included in other invested assets: (Dollars in millions) Quoted prices in active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Total At December 31, 2016 Life policy loans $ — $ — $ 40 $ 40 At December 31, 2015 Life policy loans $ — $ — $ 40 $ 40 Outstanding principal and interest for these life policy loans totaled $31 million at December 31, 2016 and 2015 . 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 active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Total At December 31, 2016 Deferred annuities $ — $ — $ 839 $ 839 Structured settlements — 206 — 206 Total $ — $ 206 $ 839 $ 1,045 At December 31, 2015 Deferred annuities $ — $ — $ 886 $ 886 Structured settlements — 208 — 208 Total $ — $ 208 $ 886 $ 1,094 Recorded reserves for the deferred annuities were $861 million and $860 million at December 31, 2016 and 2015 , respectively. Recorded reserves for the structured settlements were $170 million and $174 million at December 31, 2016 and 2015 , respectively. Fair values for deferred annuities were calculated based upon internally developed models because active markets and observable inputs do not exist. 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, 2016 and 2015 , 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. Fair values for structured settlements were calculated based on internally developed models which assume 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, 2016 and 2015 , to account for nonperformance risk.

Property Casualty Loss And Loss

Property Casualty Loss And Loss Expenses	12 Months Ended
	Dec. 31, 2016
Insurance [Abstract]
Property Casualty Loss And Loss Expenses	Property Casualty Loss and Loss Expenses 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, claims, underwriting, loss prevention and accounting management. This committee 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. Our reserving process takes into account known facts and interpretations of circumstances and factors including the type of claim, policy provisions pertaining to each claim, potential subrogation or salvage recoverable, large loss activity and trends, new business activity, judicial decisions, economic conditions, changes in law and regulation and product and underwriting changes. There have been no significant changes in methodologies and assumptions used in calculating loss and loss expense reserves for all years presented. There were no material additional premiums or return premiums accrued for as a result of prior-year effects. Our field claims representatives establish case reserves when claims are reported to provide for our unpaid loss and loss expense obligation associated with individual claims. For events designated as natural catastrophes, we calculate IBNR reserves directly as a result of estimated claim counts and estimated average dollar amount per claim for each event. Once individual case reserves are established for a catastrophe event, we reduce the IBNR reserves. Our actuarial staff uses generally accepted actuarial methods and models to derive ultimate loss and IBNR reserve estimates. The time interval between a claims occurrence and its settlement is one of the crucial attributes when estimating ultimate losses and IBNR reserves. Due to the uncertainties inherent with loss reserves, our ultimate loss experience could prove better or worse than what our carried reserves reflect. To the extent that reserves are inadequate and are required to be increased, the amount of the increase is a charge in that period, raising our loss and loss expense ratio and reducing earnings. To the extent that reserves are redundant and are required to be released, the amount of the release is a credit in that period, reducing our loss and loss expense ratio and increasing earnings. This table summarizes activity for our consolidated property casualty loss and loss expense reserves: (Dollars in millions) Years ended December 31, 2016 2015 2014 Gross loss and loss expense reserves, January 1 $ 4,660 $ 4,438 $ 4,241 Less reinsurance recoverable 281 282 299 Net loss and loss expense reserves, January 1 4,379 4,156 3,942 Net incurred loss and loss expenses related to: Current accident year 3,029 2,756 2,725 Prior accident years (168 ) (184 ) (98 ) Total incurred 2,861 2,572 2,627 Net paid loss and loss expenses related to: Current accident year 1,260 1,152 1,212 Prior accident years 1,243 1,197 1,201 Total paid 2,503 2,349 2,413 Net loss and loss expense reserves, December 31 4,737 4,379 4,156 Plus reinsurance recoverable 298 281 282 Gross loss and loss expense reserves, December 31 $ 5,035 $ 4,660 $ 4,438 The reserve for loss and loss expense in the consolidated balance sheets also included $50 million , $58 million and $47 million , respectively, for certain life and health loss and loss expense reserves. Additional disclosures for reserves related to these health claims are not material. During 2016, we experienced $168 million of favorable development on prior accident years including $129 million of favorable development in commercial lines, $4 million of favorable development in personal lines, $34 million of favorable development in excess and surplus lines and $1 million of favorable development in our reinsurance assumed operations. We recognized favorable development of $69 million for the workers' compensation line, $29 million for the commercial property line, $20 million for the commercial casualty line and $42 million for the other commercial lines due to reduced uncertainty of prior accident year loss and loss expense for these lines. This illustrates the potential for revisions inherent in estimating reserves, especially for long-tail lines such as workers’ compensation. We recognized unfavorable reserve development of $31 million for the commercial auto line and $18 million for the personal auto line. Both lines developed unfavorable 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 2015 , we experienced $184 million of favorable development on prior accident years including $154 million of favorable development in commercial lines, $5 million of adverse development in personal lines and $35 million of favorable development in excess and surplus lines. Favorable development in 2015 was $86 million more than in 2014 , due primarily to reduced uncertainty of prior accident year loss and loss expense. This illustrates the potential for revisions inherent in estimating reserves, especially for long-tail lines such as commercial casualty and workers’ compensation. We recognized favorable development of $93 million for the workers' compensation line, largely due to more favorable 2015 workers' compensation trends for estimated payments to be made in future calendar years that were down slightly from 2014 . We recognized favorable development of $63 million for the commercial casualty line. Development for products liability was favorable for most prior accident years and development of prior years for commercial umbrella coverage improved slightly better than expected. Therefore, estimated ultimate losses were lowered. Our commercial auto line experienced $31 million of adverse development 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. We believe we were slow to recognize some of the higher loss cost effects. 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. 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 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. Included in our lines of business are asbestos and environmental claims. We carried $85 million of net loss and loss expense reserves for asbestos and environmental claims and $45 million of reserves for mold claims at December 31, 2016, compared with $84 million and $45 million , respectively, at December 31, 2015. The asbestos and environmental claims amounts for each respective year constituted 1.8 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 almost all 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. The following table provides a reconciliation of the property casualty incurred losses and allocated loss adjustment expenses (ALAE) development and paid losses and ALAE development information at December 31, 2016. (Dollars in millions) Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance Total liabilities for loss and ALAE, net of reinsurance Reinsurance recoverable on unpaid losses Total liabilities for gross loss and loss expense reserves Commercial casualty $ 4,160 $ 2,421 $ 81 $ 1,820 $ 137 $ 1,957 Workers' compensation 2,370 1,686 242 926 75 1,001 Commercial auto 1,768 1,264 12 516 5 521 Commercial property 2,187 1,910 11 288 18 306 Personal auto 1,633 1,388 4 249 31 280 Homeowner 1,452 1,322 2 132 2 134 Excess and surplus 366 144 1 223 6 229 Other short-duration insurance lines 342 Total liabilities for loss and ALAE reserves 4,770 Unallocated loss adjustment expense reserves 265 Gross loss and loss expense reserves $ 5,035 For all lines of business, the claim counts reported are primarily measured by insurance coverages that are triggered when a loss occurs and a reserve is established. For this purpose, coverages are defined as unique combinations of certain attributes such as line of business and cause of loss. Claims that are opened and closed without payment are included in the reported claim counts. Claim counts are presented on a direct basis only and do not reflect any assumed or ceded reinsurance. In the following tables, commercial casualty and workers' compensation each disclose 10 accident years of loss and ALAE reserves and eight accident years of the cumulative number of reported claims. In 2009, we refined our claim count logic such that the definition of an open claim, a closed claim and a claim that closes without payment was uniform amongst all of our systems, including legacy systems. Therefore, consistent definitions are only available for accident year 2009 and forward. We will increase the commercial casualty and workers’ compensation cumulative number of reported claims by one year in future periods, not to exceed 10 years . Commercial auto, commercial property, personal auto and homeowner each disclose five accident years of loss and ALAE reserves and cumulative number of reported claims as each of these lines have five year cumulative average annual percentage payouts in excess of 95 percent. The excess and surplus lines began operations in 2008 with earned premiums and loss and ALAE reserves being immaterial prior to 2011. Accordingly, we initially disclose six accident years of loss and ALAE reserves and cumulative number of reported claims for the excess and surplus lines, and will disclose additional accident years, not to exceed 10 years. Commercial Casualty The following table shows the commercial casualty incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred but not reported liabilities plus expected development on reported losses Cumulative number of reported claims Years ended December 31, Accident 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year Unaudited 2016 2007 $ 509 $ 447 $ 412 $ 379 $ 352 $ 334 $ 328 $ 338 $ 333 $ 341 $ 5 — 2008 516 458 409 387 362 359 357 357 355 10 — 2009 484 409 412 360 370 365 357 357 21 20 2010 495 394 378 349 347 348 349 31 20 2011 466 404 377 377 375 380 37 19 2012 466 414 417 394 394 48 18 2013 448 443 431 416 96 19 2014 503 496 479 128 20 2015 533 526 225 19 2016 563 337 15 Total $ 4,160 Cumulative paid losses and ALAE, net of reinsurance 2007 $ 29 $ 92 $ 145 $ 200 $ 248 $ 275 $ 290 309 $ 314 $ 324 2008 31 93 158 212 262 293 315 325 331 2009 27 75 151 213 267 295 310 322 2010 33 92 159 203 256 285 300 2011 27 93 149 227 266 298 2012 27 88 170 232 288 2013 35 90 159 232 2014 34 97 172 2015 38 108 2016 46 Total 2,421 All outstanding liabilities before 2007, net of reinsurance 81 Liabilities for loss and ALAE, net of reinsurance $ 1,820 The following table shows the average annual percentage payout of incurred losses for the commercial casualty line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 9 10 Average annual percentage payout 8.0% 15.4% 17.7% 16.5% 13.8% 8.3% 4.7% 4.0% 1.5% 2.9% Workers’ Compensation The following table shows the workers’ compensation incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year Unaudited 2016 2007 $ 286 $ 281 $ 287 $ 286 $ 277 $ 279 $ 280 $ 277 277 $ 275 $ 28 — 2008 298 305 310 302 299 299 297 296 296 31 — 2009 307 278 263 238 238 235 234 234 22 27 2010 283 274 248 242 240 239 240 26 26 2011 284 251 246 242 239 236 26 24 2012 265 245 234 220 213 29 21 2013 264 246 221 212 34 20 2014 261 233 214 48 19 2015 246 220 83 17 2016 230 106 14 Total $ 2,370 Cumulative paid losses and ALAE, net of reinsurance 2007 $ 67 $ 145 $ 185 $ 206 $ 219 $ 226 $ 230 $ 233 $ 237 $ 238 2008 72 155 195 217 233 242 247 251 254 2009 65 132 163 179 188 193 198 201 2010 67 134 164 181 192 198 202 2011 65 131 161 177 186 190 2012 62 121 147 162 171 2013 61 119 144 157 2014 56 110 134 2015 47 93 2016 46 Total 1,686 All outstanding liabilities before 2007, net of reinsurance 242 Liabilities for loss and ALAE, net of reinsurance $ 926 The following table shows the average annual percentage payout of incurred losses for the workers’ compensation line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 9 10 Average annual percentage payout 25.7% 26.9% 12.7% 7.1% 4.4% 2.4% 1.6% 1.4% 1.2% 0.5% Commercial Auto The following table shows the commercial auto incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 275 $ 273 $ 285 $ 288 $ 294 $ 2 43 2013 292 305 315 322 9 46 2014 333 346 351 14 51 2015 374 384 38 51 2016 417 81 49 Total $ 1,768 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 129 $ 184 $ 222 $ 258 $ 278 2013 141 199 246 285 2014 159 223 273 2015 173 244 2016 184 Total 1,264 All outstanding liabilities before 2012, net of reinsurance 12 Liabilities for loss and ALAE, net of reinsurance $ 516 The following table shows the average annual percentage payout of incurred losses for the commercial auto line of business. Commercial auto includes both physical damage and liability losses. A majority of the incurred losses paid after year 2 are the result of liability losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 44.4% 18.4% 13.9% 12.2% 6.9% Commercial Property The following table shows the commercial property incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 403 $ 389 $ 388 $ 383 $ 386 $ — 16 2013 389 359 352 356 2 14 2014 452 444 441 — 17 2015 454 414 5 16 2016 590 38 16 Total $ 2,187 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 255 $ 356 $ 376 $ 380 $ 383 2013 227 330 344 349 2014 297 412 432 2015 279 388 2016 358 Total 1,910 All outstanding liabilities before 2012, net of reinsurance 11 Liabilities for loss and ALAE, net of reinsurance $ 288 The following table shows the average annual percentage payout of incurred losses for the commercial property line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 65.0% 26.8% 4.6% 1.2% 0.9% Personal Auto The following table shows the personal auto incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 260 $ 265 $ 269 $ 270 $ 271 $ — 89 2013 280 280 293 298 — 96 2014 317 317 325 — 104 2015 343 356 12 108 2016 383 38 104 Total $ 1,633 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 174 $ 223 $ 250 $ 262 $ 268 2013 190 245 272 287 2014 210 267 298 2015 229 292 2016 243 Total 1,388 All outstanding liabilities before 2012, net of reinsurance 4 Liabilities for loss and ALAE, net of reinsurance $ 249 The following table shows the average annual percentage payout of incurred losses for the personal auto line of business. Personal auto includes both physical damage and liability losses. A majority of the incurred losses paid after year 2 are the result of liability losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 64.0% 17.9% 9.6% 4.8% 2.0% Homeowner The following table shows the homeowner incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 344 $ 330 $ 328 $ 330 $ 329 $ — 33 2013 252 246 247 247 — 25 2014 297 283 286 — 26 2015 284 275 3 23 2016 315 29 21 Total $ 1,452 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 256 $ 317 $ 324 $ 328 $ 329 2013 180 236 242 244 2014 224 273 281 2015 203 260 2016 208 Total 1,322 All outstanding liabilities before 2012, net of reinsurance 2 Liabilities for loss and ALAE, net of reinsurance $ 132 The following table shows the average annual percentage payout of incurred losses for the homeowner line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 73.8% 19.7% 2.6% 1.0% 0.3% Excess and Surplus Lines The following table shows the excess and surplus incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2011 2012 2013 2014 2015 Year Unaudited 2016 2011 $ 48 $ 47 $ 44 $ 38 $ 36 $ 35 $ — 1 2012 67 56 49 40 37 2 1 2013 74 64 54 45 9 2 2014 95 82 75 26 2 2015 96 81 40 2 2016 93 54 2 Total $ 366 Cumulative paid losses and ALAE, net of reinsurance 2011 $ 8 $ 14 $ 23 $ 27 $ 30 $ 32 2012 9 15 19 25 29 2013 7 12 20 27 2014 9 17 27 2015 8 19 2016 10 Total 144 All outstanding liabilities before 2011, net of reinsurance 1 Liabilities for loss and ALAE, net of reinsurance $ 223 The following table shows the average annual percentage payout of incurred losses for the excess and surplus lines insurance segment. Excess and surplus lines consist mostly of commercial casualty and commercial property coverages. A majority of the incurred losses paid after year 2 are the result of commercial casualty losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 Average annual percentage payout 15.9% 13.5% 17.4% 13.5% 9.9% 7.4%

Life Policy And Investment Cont

Life Policy And Investment Contract Reserves	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Life policy reserves: Ordinary/traditional life $ 1,011 $ 943 Other 45 44 Subtotal 1,056 987 Investment contract reserves: Deferred annuities 861 860 Universal life 578 558 Structured settlements 170 174 Other 6 4 Subtotal 1,615 1,596 Total life policy and investment contract reserves $ 2,671 $ 2,583

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Costs	12 Months Ended
	Dec. 31, 2016
Deferred Costs [Abstract]
Deferred Policy Acquisition Costs	Deferred Policy Acquisition Costs Expenses directly related to successfully acquired 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. The table below shows the deferred policy acquisition costs and asset reconciliation: (Dollars in millions) Years ended December 31, 2016 2015 2014 Property casualty: Deferred policy acquisition costs asset, January 1 $ 388 $ 379 $ 366 Capitalized deferred policy acquisition costs 840 801 783 Amortized deferred policy acquisition costs (820 ) (792 ) (770 ) Deferred policy acquisition costs asset, December 31 $ 408 $ 388 $ 379 Life: Deferred policy acquisition costs asset, January 1 $ 228 $ 199 $ 199 Capitalized deferred policy acquisition costs 49 45 44 Amortized deferred policy acquisition costs (43 ) (37 ) (37 ) Amortized shadow deferred policy acquisition costs (5 ) 21 (7 ) Deferred policy acquisition costs asset, December 31 $ 229 $ 228 $ 199 Consolidated: Deferred policy acquisition costs asset, January 1 $ 616 $ 578 $ 565 Capitalized deferred policy acquisition costs 889 846 827 Amortized deferred policy acquisition costs (863 ) (829 ) (807 ) Amortized shadow deferred policy acquisition costs (5 ) 21 (7 ) Deferred policy acquisition costs asset, December 31 $ 637 $ 616 $ 578 No premium deficiencies were recorded in the consolidated statements of income in 2016 , 2015 and 2014 , as the sum of the anticipated loss and loss 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, 2016
Notes Payable, Current [Abstract]
Note Payable	Note Payable We have one line of credit in 2016 and 2015 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 2016 or 2015 . At December 31, 2016 , $20 million was drawn on the line of credit. At December 31, 2015 , $35 million was drawn on the line of credit. The interest rate charged on our borrowings on this credit agreement ranged from 1.31 percent to 1.49 percent during 2016 and ranged from 1.07 percent to 1.19 percent during 2015 .

Long-Term Debt And Capital Leas

Long-Term Debt And Capital Lease Obligation	12 Months Ended
	Dec. 31, 2016
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 issue At December 31, At December 31, 2016 2015 2016 2015 6.900% 1998 Senior debentures, due 2028 $ 26 $ 26 $ 28 $ 28 6.920% 2005 Senior debentures, due 2028 391 391 391 391 6.125% 2004 Senior notes, due 2034 370 369 374 374 Total $ 787 $ 786 $ 793 $ 793 Capital lease obligations, excluding an insignificant amount of interest, totaled $39 million and $35 million in 2016 and 2015 , 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, 2017 2018 2019 2020 2021 2022 Capital lease obligations $ 12 $ 10 $ 7 $ 5 $ 3 $ 2

Shareholders' Equity And Divide

Shareholders' Equity And Dividend Restrictions	12 Months Ended
	Dec. 31, 2016
Shareholders Equity And Dividend Restrictions [Abstract]
Shareholders' Equity And Dividend Restrictions	Shareholders’ Equity and Dividend Restrictions Declared cash dividends per share were $1.92 , $2.30 and $1.76 for the years ended December 31, 2016 , 2015 and 2014 , respectively. Our insurance subsidiary declared dividends to the parent company of $475 million in 2016 , $447 million in 2015 and $400 million in 2014 . 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 2017 , the total that our insurance subsidiary, which is the parent of all other insurance subsidiaries, may declare in dividends is approximately $469 million . Accumulated Other Comprehensive Income The table below shows beginning and end of year accumulated other comprehensive income (AOCI) 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) 2016 2015 2014 Before tax Income tax Net Before Income Net Before Income Net Investments: AOCI, January 1 $ 2,094 $ 722 $ 1,372 $ 2,719 $ 942 $ 1,777 $ 2,335 $ 808 $ 1,527 OCI before realized gains recognized in net income 653 229 424 (556 ) (196 ) (360 ) 514 181 333 Realized gains recognized in net income (122 ) (43 ) (79 ) (69 ) (24 ) (45 ) (130 ) (47 ) (83 ) OCI 531 186 345 (625 ) (220 ) (405 ) 384 134 250 AOCI, December 31 $ 2,625 $ 908 $ 1,717 $ 2,094 $ 722 $ 1,372 $ 2,719 $ 942 $ 1,777 Pension obligations: AOCI, January 1 $ (42 ) $ (14 ) $ (28 ) $ (36 ) $ (12 ) $ (24 ) $ (18 ) $ (6 ) $ (12 ) OCI excluding amortization recognized in net income 13 5 8 (12 ) (5 ) (7 ) (21 ) (7 ) (14 ) Amortization recognized in net income 3 1 2 6 3 3 3 1 2 OCI 16 6 10 (6 ) (2 ) (4 ) (18 ) (6 ) (12 ) AOCI, December 31 $ (26 ) $ (8 ) $ (18 ) $ (42 ) $ (14 ) $ (28 ) $ (36 ) $ (12 ) $ (24 ) Life deferred acquisition costs, life policy reserves and other: AOCI, January 1 $ 1 $ 1 $ — $ (12 ) $ (3 ) $ (9 ) $ (16 ) $ (5 ) $ (11 ) OCI before realized gains recognized in net income (8 ) (3 ) (5 ) 14 5 9 7 3 4 Realized gains recognized in net income (2 ) (1 ) (1 ) (1 ) (1 ) — (3 ) (1 ) (2 ) OCI (10 ) (4 ) (6 ) 13 4 9 4 2 2 AOCI, December 31 $ (9 ) $ (3 ) $ (6 ) $ 1 $ 1 $ — $ (12 ) $ (3 ) $ (9 ) Summary of AOCI: AOCI, January 1 $ 2,053 $ 709 $ 1,344 $ 2,671 $ 927 $ 1,744 $ 2,301 $ 797 $ 1,504 Investments OCI 531 186 345 (625 ) (220 ) (405 ) 384 134 250 Pension obligations OCI 16 6 10 (6 ) (2 ) (4 ) (18 ) (6 ) (12 ) Life deferred acquisition costs, life policy reserves and other OCI (10 ) (4 ) (6 ) 13 4 9 4 2 2 Total OCI 537 188 349 (618 ) (218 ) (400 ) 370 130 240 AOCI, December 31 $ 2,590 $ 897 $ 1,693 $ 2,053 $ 709 $ 1,344 $ 2,671 $ 927 $ 1,744 Investments realized gains and life deferred acquisition costs, life policy reserves and other realized gains are recorded in the realized investment gains, net, line item in the consolidated statements of income. Amortization on pension obligations is recorded in the insurance losses and contract holders' benefits and underwriting, acquisition and insurance expenses in the consolidated statements of income.

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2016
Reinsurance Disclosures [Abstract]
Reinsurance	Reinsurance Primary components of our property casualty reinsurance assumed operations include involuntary and voluntary assumed as well as contracts from our reinsurance assumed operations, known as Cincinnati Re. Primary components of our ceded reinsurance include a property per risk treaty, property excess treaty, casualty per occurrence treaty, casualty excess treaty, property catastrophe treaty and catastrophe bonds and retrocessions on our reinsurance assumed operations. 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. The table below includes our net written consolidated property casualty insurance premiums on assumed and ceded business: (Dollars in millions) Years ended December 31, 2016 2015 2014 Direct written premiums $ 4,646 $ 4,461 $ 4,309 Assumed written premiums 103 77 11 Ceded written premiums (169 ) (177 ) (177 ) Net written premiums $ 4,580 $ 4,361 $ 4,143 Our consolidated statements of income include earned consolidated property casualty insurance premiums on assumed and ceded business: (Dollars in millions) Years ended December 31, 2016 2015 2014 Direct earned premiums $ 4,567 $ 4,396 $ 4,209 Assumed earned premiums 77 29 12 Ceded earned premiums (162 ) (154 ) (176 ) Earned premiums $ 4,482 $ 4,271 $ 4,045 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, 2016 2015 2014 Direct incurred loss and loss expenses $ 2,874 $ 2,596 $ 2,661 Assumed incurred loss and loss expenses 43 12 6 Ceded incurred loss and loss expenses (56 ) (36 ) (40 ) Incurred loss and loss expenses $ 2,861 $ 2,572 $ 2,627 Our change in ceded incurred compared to prior years resulted primarily from increased retrocessions of Cincinnati Re. Our life insurance company purchases reinsurance for protection of a portion of risks that are 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, 2016 2015 2014 Direct earned premiums $ 290 $ 271 $ 259 Ceded earned premiums (62 ) (62 ) (61 ) Earned premiums $ 228 $ 209 $ 198 Our consolidated statements of income include life insurance contract holders' benefits incurred on ceded business: (Dollars in millions) Years ended December 31, 2016 2015 2014 Direct contract holders' benefits incurred $ 303 $ 292 $ 299 Ceded contract holders' benefits incurred (57 ) (56 ) (70 ) Contract holders' benefits incurred $ 246 $ 236 $ 229 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, 2016
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, 2016 2015 Deferred tax assets: Loss and loss expense reserves $ 199 $ 191 Unearned premiums 158 151 Investments 5 25 Other 52 42 Total gross deferred tax assets 414 409 Deferred tax liabilities: Unrealized investment gains, net 907 719 Deferred acquisition costs 195 187 Life policy reserves 162 137 Other 15 4 Total gross deferred tax liabilities 1,279 1,047 Net deferred income tax liability $ 865 $ 638 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. Deferred tax assets are reduced by a valuation allowance when management believes it is more likely than not that some, or all, of the deferred tax assets will not be realized. After considering all positive and negative evidence of taxable income in the carryback and carryforward periods as permitted by law, we believe it is more likely than not that all of the deferred tax asset will be realized. As a result, we have no valuation allowance as of December 31, 2016 and 2015. 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, 2016 2015 2014 Tax at statutory rate: $ 284 35.0 % $ 308 35.0 % $ 252 35.0 % Increase (decrease) resulting from: Tax-exempt income from municipal bonds (34 ) (4.2 ) (33 ) (3.7 ) (33 ) (4.6 ) Dividend received exclusion (33 ) (4.1 ) (32 ) (3.6 ) (29 ) (4.0 ) Other 4 0.5 4 0.3 6 0.8 Provision for income taxes $ 221 27.2 % $ 247 28.0 % $ 196 27.2 % 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, 2016 , 2015 and 2014 , we had no operating or capital loss carryforwards. Unrecognized Tax Benefits As a result of positions either taken in our 2013 through 2015 federal tax returns filed with the IRS or expected to be taken in the 2016 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 2013 through 2016 . The statute of limitations for federal tax purposes has closed for tax years 2012 and earlier. There are no federal returns under examination and we have not been notified of any upcoming IRS examinations. Income taxes paid in our consolidated statements of cash flows are shown net of refunds received of $2 million in 2016 and an immaterial amount in 2015 and 2014. 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 2012 and earlier. There are no state income returns under examination and we have not been notified of any upcoming state examinations.

Net Income Per Common Share

Net Income Per Common Share	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Numerator: Net income—basic and diluted $ 591 $ 634 $ 525 Denominator: Basic weighted-average common shares outstanding 164.5 164.0 163.5 Effect of share-based awards: Stock options 1.1 1.0 1.0 Nonvested shares 0.9 0.6 0.6 Diluted weighted-average shares 166.5 165.6 165.1 Earnings per share: Basic $ 3.59 $ 3.87 $ 3.21 Diluted 3.55 3.83 3.18 Number of anti-dilutive share-based awards 0.3 0.4 0.7 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 share-based awards at year-end 2016 , 2015 and 2014 . We did not include these share-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, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Retirement Benefits	Employee Retirement Benefits We sponsor a qualified defined benefit pension plan that we closed entry into 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. During 2008, we changed the form of retirement benefit we offer some associates to a company match on contributions to a 401(k) plan as further explained below. For participants remaining in the pension plan, we continue 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 net periodic benefit cost 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 sponsor a defined contribution plan (401(k) plan) with matching company contributions totaling $14 million , $12 million and $11 million during the years 2016 , 2015 and 2014 , 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 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 $15 million at year-end 2016 and $14 million at year-end 2015 , 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 $24 million and $21 million at December 31, 2016 and 2015 , 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 2016 2015 2016 2015 Discount rate 4.30 % 4.55 % 4.10 % 4.30 % 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 0.25 percentage points for the qualified pension plan and by 0.20 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. During 2016 and 2015, the 2014 mortality assumption was updated to include the generational projection using Scale MP-2016 and Scale MP-2015, respectively. The updated mortality table did not have a significant impact on our consolidated financial statements as our qualified plan assumes the majority of benefits will be paid in the form of lump sums. This is a summary of the weighted-average assumptions used to determine our net periodic benefit cost for the plans: Qualified Pension Plan SERP 2016 2015 2014 2016 2015 2014 Discount rate 4.55 % 4.25 % 5.15 % 4.30 % 4.05 % 4.80 % Expected return on plan assets 7.25 7.25 7.25 n/a n/a n/a Rate of compensation increase 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25 The discount rate was increased by 0.30 percentage points for the qualified pension plan and 0.25 percentage points for the SERP due to market interest rate conditions at the beginning of 2016 . 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 2016 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 2016 was 16.6 percent and for 2015 was 0.6 percent. Our compensation increase assumptions in 2016 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 pension plan and SERP at December 31 follows: (Dollars in millions) At December 31, 2016 2015 Change in projected benefit obligation: Benefit obligation, January 1 $ 323 $ 319 Service cost 11 12 Interest cost 14 14 Actuarial loss (gain) 13 (3 ) Benefits paid (21 ) (19 ) Projected benefit obligation, December 31 $ 340 $ 323 Change in plan assets: Fair value of plan assets, January 1 $ 278 $ 288 Actual return on plan assets 45 3 Employer contribution 13 6 Benefits paid (21 ) (19 ) Fair value of plan assets, December 31 $ 315 $ 278 Funded status, December 31 $ (25 ) $ (45 ) Accumulated benefit obligation $ 309 $ 293 Our unfunded status improved for 2016 primarily due to better-than-expected return on plan assets offset by an increase in actuarial losses resulting largely from decreases in discount rate and lump sum rates. 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, 2016 2015 Pension amounts recognized in the consolidated balance sheets: Other liabilities $ (25 ) $ (45 ) Total $ (25 ) $ (45 ) Pension amounts recognized in accumulated other comprehensive income: Net actuarial loss $ 26 $ 41 Prior service cost — 1 Total $ 26 $ 42 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, 2016 2015 2014 Net periodic benefit cost: Service cost $ 11 $ 12 $ 10 Interest cost 14 14 15 Expected return on plan assets (19 ) (18 ) (17 ) Amortization of actuarial loss and prior service cost 3 6 2 Other — 1 3 Net periodic benefit cost $ 9 $ 15 $ 13 (Dollars in millions) Years ended December 31, 2016 2015 2014 Other changes in plan assets and benefit obligations recognized in other comprehensive income: Current year actuarial (gain) loss $ (13 ) $ 13 $ 21 Amortization of actuarial loss (2 ) (6 ) (5 ) Current year prior service cost — — 2 Amortization of prior service cost (1 ) (1 ) — Total recognized in other comprehensive (income) loss $ (16 ) $ 6 $ 18 The total recognized in net periodic benefit cost and other comprehensive income (loss) was a net gain of $7 million , net cost of $21 million , and a net cost of $31 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. The 2016 change in the amount recognized in other comprehensive income from 2015 is largely due to better-than-expected investment return partially offset with decreases in discount and lump sum rates. The estimated costs to be amortized from AOCI into net periodic benefit cost over the next year for our plans are $2 million in actuarial loss and less than $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 2016 we held approximately 83 percent of our pension portfolio in domestic common equity investments. The remainder of the portfolio consisted of 10 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 22 percent in the information technology sector, 20 percent in the financial sector, 14 percent in the healthcare sector, 10 percent in the consumer staples sector, 10 percent in the consumer discretionary sector and 10 percent in the industrial sector at year-end 2016 . No additional sectors accounted for 10 percent or more of our common equity portfolio balance at year-end 2016 . 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, 2016 and 2015 . There have been no transfers between Level 1 and Level 2 for the years ended December 31, 2016 and 2015 . The following table shows the fair value hierarchy for those assets measured at fair value on a recurring basis at December 31, 2016 and 2015 . Excluded from the table below is cash on hand of $11 million and $21 million at December 31, 2016 and 2015 , respectively. (Dollars in millions) Quoted prices in Significant other Significant (Level 3) Total At December 31, 2016 Fixed maturities, available for sale: States, municipalities and political subdivisions $ — $ 31 $ — $ 31 Corporate securities — 20 — 20 Total fixed maturities, available for sale — 51 — 51 Common equities, available for sale 253 — — 253 Total $ 253 $ 51 $ — $ 304 At December 31, 2015 Fixed maturities, available for sale: States, municipalities and political subdivisions $ — $ 32 $ — $ 32 Corporate securities — 13 — 13 Total fixed maturities, available for sale — 45 — 45 Common equities, available for sale 212 — — 212 Total $ 212 $ 45 $ — $ 257 Our pension plan assets included 232,113 and 267,113 shares of the company’s common stock at December 31, 2016 and 2015 , which had a fair value of $18 million and $16 million at December 31, 2016 and 2015 , respectively. The defined benefit pension plan did not purchase any shares of our common stock during 2016 and 2015 . During 2016 and 2015, the pension plan sold 35,000 shares and 200,000 shares of the company’s common stock, respectively. The company paid less than $1 million in 2016 and $1 million in 2015 in cash dividends on our common stock to the pension plan. We contributed $5 million to our qualified plan during the first quarter of 2017 and estimate $12 million of benefit payments from the SERP during 2017 . 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, 2017 2018 2019 2020 2021 2022 - 2026 Expected future benefit payments $ 34 $ 23 $ 24 $ 26 $ 28 $ 148

Statutory Accounting Informatio

Statutory Accounting Information	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 2016 2015 The Cincinnati Insurance Company $ 434 $ 534 $ 436 $ 4,686 $ 4,412 The Cincinnati Casualty Company 11 12 12 360 337 The Cincinnati Indemnity Company 4 3 3 93 88 The Cincinnati Specialty Underwriters Insurance Company 57 49 32 372 306 The Cincinnati Life Insurance Company 2 (11 ) (19 ) 200 208

Transactions With Affiliated Pa

Transactions With Affiliated Parties	12 Months Ended
	Dec. 31, 2016
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 2016 , 2015 and 2014 , on premium volume of $44 million , $42 million and $41 million for 2016 , 2015 and 2014 , respectively.

Commitments And Contingent Liab

Commitments And Contingent Liabilities	12 Months Ended
	Dec. 31, 2016
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 named as defendants in various legal proceedings. Most of these proceedings are claims litigation involving the company's insurance subsidiaries in which the company is either defending or providing indemnity for 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 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 databases 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 handling of insurance claims or writing unauthorized coverage or claims alleging discrimination by former or current 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 matters for which the risk of loss is not probable, but more than remote, is immaterial.

Share-Based Associate Compensat

Share-Based Associate Compensation Plans	12 Months Ended
	Dec. 31, 2016
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 2016 and 2015. Share-based compensation cost after tax was $15 million , $14 million and $13 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. The related income tax benefit recognized was $8 million for the year ended December 31, 2016 and $6 million for both the years ended December 31, 2015 and 2014 , respectively. Options exercised during the years ended December 31, 2016 , 2015 and 2014 , had intrinsic value of $25 million , $15 million and $13 million , respectively. Intrinsic value is the market price less the exercise price. Options vested during the years ended December 31, 2016 , 2015 and 2014 , had total intrinsic value of $11 million , $7 million and $9 million , respectively. As of December 31, 2016 , we had $26 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 1.8 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: 2016 2015 2014 Weighted-average expected term 8 years 8-9 years 8-9 years Expected volatility 24.88-25.75% 25.04-26.15% 25.20-26.22% Dividend yield 2.58-3.12% 3.52% 3.76% Risk-free rates 1.44-1.60% 1.94-2.01% 2.42-2.62% Weighted-average fair value of options granted during the period $13.21 $11.15 $10.16 Below is a summary of option information for the year 2016: (Dollars in millions, shares in thousands) Shares Weighted- exercise price Aggregate Weighted-average Outstanding option shares at January 1, 2016 3,872 $ 39.78 Granted 359 61.47 Exercised (863 ) 38.64 Forfeited or expired (356 ) 44.66 Outstanding option shares at December 31, 2016 3,012 42.12 $ 101 5.05 years Options exercisable at end of period 2,319 $ 38.01 $ 88 4.04 years Cash received from the exercise of options was $21 million , $24 million and $22 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. We acquired 186,097 , 292,414 and 378,276 shares totaling $13 million , $16 million and $19 million , respectively, from associates in consideration for option exercises during 2016 , 2015 and 2014 . The weighted-average remaining contractual life for options expected to vest as of December 31, 2016 , was 8.44 years . Under all active shareholder approved plans, a total of 17.3 million shares were authorized to be granted. At December 31, 2016 , 13.0 million shares remained available for future issuance under the plans. During 2016 , we granted 18,769 shares of common stock to our directors for 2015 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 generally cliff vest three years after the date of grant. During 2016 , we also granted restricted stock units which vest on a three year ratable vesting schedule. Service-based restricted stock units vested during the year had an intrinsic value of $23 million , $26 million and $14 million for the years ended December 31, 2016 , 2015 and 2014 , 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 to 200 percent for awards granted in 2014 , 2015 and 2016 . Three -year total shareholder return is calculated by using annualized total return of a stock to an investor due to capital gain appreciation plus reinvestment of all dividends. For the three-year performance period ended December 31, 2016, our total shareholder returned exceeded five of our nine peers. We expect payout of these shares at the target level to occur in March of 2017. During 2016, we issued 25,461 shares of performance-based restricted stock units at the threshold-level performance hurdle for the three-year performance period ended December 31, 2015, as our total shareholder return exceeded four of 10 peers in our 2013 peer group. We issued 103,586 shares of performance-based restricted stock units during 2015 at the target-level performance hurdle for the three -year performance period ended December 31, 2014, as we achieved a three -year total shareholder return that exceeded six of 10 peers in our 2012 peer group. Performance-based awards vested during the year had an intrinsic value of $6 million , $6 million and $3 million for the years ended December 31, 2016 , 2015 and 2014 , 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 stock price data used to calculate the historical volatilities. The correlation coefficients are used to model the way the price of each entity's stock tends to move in relation to each other. • Expected volatility is based on each company's historical volatility using daily stock price observations. • 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. • 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. The following assumptions were used in determining fair value for performance-based grants issued: 2016 2015 2014 Expected term 2.44-2.88 years 2.88 years 2.88 years Expected volatility 15.42-33.64% 13.78-34.69% 18.69-41.21% Dividend yield 2.58-3.12% 3.52% 3.74% Risk-free rates 0.77-0.87% 0.99% 0.66% Below is a summary of service-based and performance-based share information, assuming a target payout for performance-based shares, for the year 2016 : (Shares in thousands) Service-based Weighted- Performance-based Weighted- Nonvested at January 1, 2016 902 $ 43.15 256 $ 42.35 Granted 323 56.39 68 70.68 Vested (313 ) 40.99 (25 ) 44.82 Forfeited or canceled (24 ) 48.31 (63 ) 44.82 Nonvested at December 31, 2016 888 48.59 236 49.64

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information We operate primarily in two industries, property casualty insurance and life insurance. Our chief operating decision maker regularly reviews 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 and Cincinnati Re, our reinsurance assumed operations. Revenues come primarily from unaffiliated customers: • All four insurance segments record revenues from insurance premiums earned. • Fee revenues for the commercial, personal and excess and surplus 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 and, beginning in 2015, earned premiums of Cincinnati Re. 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 fee revenue, 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, operating expenses of our headquarters and, beginning in 2015, premiums earned minus loss and loss expenses and underwriting expenses of Cincinnati Re. 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. Segment information is summarized in the following table: (Dollars in millions) Years ended December 31, 2016 2015 2014 Revenues: Commercial lines insurance Commercial casualty $ 1,050 $ 1,010 $ 938 Commercial property 867 815 728 Commercial auto 594 561 528 Workers' compensation 354 367 370 Other commercial 224 243 292 Commercial lines insurance premiums 3,089 2,996 2,856 Fee revenues 5 4 4 Total commercial lines insurance 3,094 3,000 2,860 Personal lines insurance Personal auto 543 506 476 Homeowner 486 463 443 Other personal 132 128 122 Personal lines insurance premiums 1,161 1,097 1,041 Fee revenues 4 3 2 Total personal lines insurance 1,165 1,100 1,043 Excess and surplus lines insurance 183 168 148 Fee revenues 1 1 — Total excess and surplus lines insurance 184 169 148 Life insurance premiums 228 209 198 Fee revenues 5 5 6 Total life insurance 233 214 204 Investments Investment income, net of expenses 595 572 549 Realized investment gains, net 124 70 133 Total investment revenue 719 642 682 Other Cincinnati Re insurance premiums 49 10 — Other 5 7 8 Total other revenue 54 17 8 Total revenues $ 5,449 $ 5,142 $ 4,945 Income (loss) before income taxes: Insurance underwriting results Commercial lines insurance $ 184 $ 345 $ 146 Personal lines insurance (12 ) (12 ) 10 Excess and surplus lines insurance 62 51 30 Life insurance 1 (2 ) (5 ) Investments 629 556 599 Other (52 ) (57 ) (59 ) Total income before income taxes $ 812 $ 881 $ 721 December 31, December 31, Identifiable assets: 2016 2015 Property casualty insurance $ 2,967 $ 2,717 Life insurance 1,366 1,325 Investments 15,569 14,485 Other 484 361 Total $ 20,386 $ 18,888

Quarterly Supplementary Data

Quarterly Supplementary Data	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Supplementary Data	Quarterly Supplementary Data This table includes unaudited quarterly financial information for the years ended December 31, 2016 and 2015 : (Dollars in millions except per share data) Quarter 1st 2nd 3rd 4th Full year 2016 Revenues $ 1,364 $ 1,371 $ 1,402 $ 1,312 $ 5,449 Income before income taxes 265 166 253 128 812 Net income 188 123 180 100 591 Net income per common share—basic 1.14 0.75 1.09 0.61 3.59 Net income per common share—diluted 1.13 0.74 1.08 0.60 3.55 2015 Revenues $ 1,285 $ 1,316 $ 1,278 $ 1,263 $ 5,142 Income before income taxes 174 248 243 216 881 Net income 128 176 174 156 634 Net income per common share—basic 0.78 1.07 1.06 0.95 3.87 Net income per common share—diluted 0.77 1.06 1.05 0.94 3.83 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 Th

Summary Of Investments Other Than Investments In Related Parties	12 Months Ended
	Dec. 31, 2016
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, 2016 Type of investment Cost or amortized cost Fair value Balance sheet Fixed maturities: States, municipalities and political subdivisions: The Cincinnati Insurance Company $ 2,900 $ 2,934 $ 2,934 The Cincinnati Casualty Company 149 150 150 The Cincinnati Indemnity Company 39 40 40 The Cincinnati Life Insurance Company 272 287 287 The Cincinnati Specialty Underwriters Insurance Company 409 416 416 CSU Producer Resources Inc. 1 1 1 Total 3,770 3,828 3,828 Convertibles and bonds with warrants attached: The Cincinnati Insurance Company 5 5 5 Total 5 5 5 United States government: The Cincinnati Insurance Company 7 7 7 The Cincinnati Casualty Company 2 2 2 The Cincinnati Indemnity Company 1 1 1 Total 10 10 10 Government-sponsored enterprises: The Cincinnati Life Insurance Company 167 164 164 Total 167 164 164 Foreign government: The Cincinnati Insurance Company 10 10 10 Total 10 10 10 All other corporate bonds: The Cincinnati Insurance Company 2,727 2,836 2,836 The Cincinnati Casualty Company 118 123 123 The Cincinnati Indemnity Company 30 31 31 The Cincinnati Specialty Underwriters Insurance Company 155 160 160 The Cincinnati Life Insurance Company 2,760 2,865 2,865 CSU Producer Resources Inc. 1 1 1 Cincinnati Financial Corporation 46 52 52 Total 5,837 6,068 6,068 Total fixed maturities $ 9,799 $ 10,085 $ 10,085 Schedule I (continued) Cincinnati Financial Corporation and Subsidiaries Summary of Investments - Other Than Investments in Related Parties (Dollars in millions) At December 31, 2016 Type of investment Cost or amortized cost Fair value Balance sheet Equity securities: Common equities: The Cincinnati Insurance Company $ 1,600 $ 3,053 $ 3,053 The Cincinnati Casualty Company 50 105 105 The Cincinnati Indemnity Company 13 24 24 The Cincinnati Specialty Underwriters Insurance Company 51 91 91 CSU Producer Resources Inc. 15 18 18 Cincinnati Financial Corporation 1,083 1,832 1,832 Total 2,812 5,123 5,123 Nonredeemable preferred equities: The Cincinnati Insurance Company 177 201 201 The Cincinnati Life Insurance Company 5 9 9 Cincinnati Financial Corporation 1 1 1 Total 183 211 211 Total equity securities $ 2,995 $ 5,334 $ 5,334 Other invested assets: Policy loans: The Cincinnati Life Insurance Company $ 31 — $ 31 Private equity: Cincinnati Financial Corporation (1) 23 — 23 Real estate: The Cincinnati Life Insurance Company (1) 21 21 Cincinnati Financial Corporation (1) 6 6 Total other invested assets $ 81 — $ 81 Total investments $ 12,875 — $ 15,500

Condensed Financial Statements

Condensed Financial Statements Of Parent Company	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Assets Investments Fixed maturities, at fair value $ 52 $ 58 Equity securities, at fair value 1,833 1,583 Other invested assets 29 36 Total investments 1,914 1,677 Cash and cash equivalents 248 106 Equity in net assets of subsidiaries 5,790 5,482 Investment income receivable 8 6 Land, building and equipment, net, for company use (accumulated depreciation: 132 139 Income tax receivable 10 6 Other assets 35 21 Due from subsidiaries 106 107 Total assets $ 8,243 $ 7,544 Liabilities Dividends declared but unpaid $ 79 $ 75 Deferred federal income tax 252 173 Long-term debt 787 786 Other liabilities 65 83 Total liabilities 1,183 1,117 Shareholders' Equity Common stock 397 397 Paid-in capital 1,252 1,232 Retained earnings 5,037 4,762 Accumulated other comprehensive income 1,693 1,344 Treasury stock at cost (1,319 ) (1,308 ) Total shareholders' equity 7,060 6,427 Total liabilities and shareholders' equity $ 8,243 $ 7,544 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, 2016 2015 2014 Revenues Investment income, net of expenses $ 56 $ 53 $ 46 Realized investment (losses) and gains, net 27 (19 ) 34 Other revenue 15 15 16 Total revenues 98 49 96 Expenses Interest expense 52 52 52 Other expenses 27 28 28 Total expenses 79 80 80 Income (Loss) Before Income Taxes and Earnings of Subsidiaries 19 (31 ) 16 Benefit for income taxes (6 ) (23 ) (5 ) Net Income (Loss) Before Earnings of Subsidiaries 25 (8 ) 21 Increase in equity of subsidiaries 566 642 504 Net Income $ 591 $ 634 $ 525 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, 2016 2015 2014 Net Income $ 591 $ 634 $ 525 Other Comprehensive Income, Before Tax Unrealized gains and (losses) on investments available for sale 221 (111 ) 150 Unrealized gains and (losses) on investments held by subsidiaries 434 (444 ) 367 Reclassification adjustment for (losses) and gains included in net income (27 ) 19 (34 ) Reclassification adjustment for (gains) included in net income on subsidiaries (97 ) (89 ) (99 ) Unrealized (losses) and gains on other (6 ) — 7 Unrealized (losses) and gains on other subsidiaries (4 ) 13 (3 ) Unrealized gains and (losses) on investments available for sale, investments held by subsidiaries and other 521 (612 ) 388 Amortization of pension actuarial gains (losses) and prior service cost 16 (6 ) (18 ) Other comprehensive income (loss) before tax 537 (618 ) 370 Income taxes on above of other comprehensive income (loss) 188 (218 ) 130 Other comprehensive income (loss), net of tax 349 (400 ) 240 Comprehensive Income $ 940 $ 234 $ 765 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, 2016 2015 2014 Cash Flows From Operating Activities Net income $ 591 $ 634 $ 525 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 6 7 7 Realized investment losses and (gains), net (27 ) 19 (34 ) Dividends from subsidiaries 475 447 400 Changes in: Increase in equity of subsidiaries (566 ) (642 ) (504 ) Investment income receivable (2 ) — (1 ) Current federal income taxes (4 ) (7 ) 3 Deferred income tax 8 (10 ) (6 ) Other assets (4 ) (3 ) 20 Other liabilities (1 ) 13 (14 ) Intercompany receivable for operations 20 16 22 Net cash provided by operating activities 496 474 418 Cash Flows From Investing Activities Call or maturity of fixed maturities 5 8 4 Sale of equity securities 135 54 112 Purchase of equity securities (175 ) (110 ) (225 ) Investment in buildings and equipment, net (2 ) — (2 ) Change in other invested assets, net 6 1 4 Net cash used by investing activities (31 ) (47 ) (107 ) Cash Flows From Financing Activities Payments on notes payable — — (55 ) Payment of cash dividends to shareholders (306 ) (366 ) (278 ) Shares acquired - share repurchase authorization (39 ) (53 ) (21 ) Proceeds from stock options exercised 21 24 22 Other 1 2 2 Net cash used in financing activities (323 ) (393 ) (330 ) Net change in cash and cash equivalents 142 34 (19 ) Cash and cash equivalents at beginning of year 106 72 91 Cash and cash equivalents at end of year $ 248 $ 106 $ 72 This condensed financial information should be read in conjunction with the Consolidated Financial Statements and Notes included in Part II, Item 8.

Supplementary Insurance Informa

Supplementary Insurance Information	12 Months Ended
	Dec. 31, 2016
Supplementary Insurance Information [Abstract]
Supplementary Insurance Information	Schedule III Cincinnati Financial Corporation and Subsidiaries Supplementary Insurance Information (Dollars in millions) Years ended December 31, 2016 2015 2014 Deferred policy acquisition costs: Commercial lines insurance $ 271 $ 264 $ 257 Personal lines insurance 110 103 108 Excess and surplus lines insurance 16 15 14 Cincinnati Re 11 6 — Total property casualty insurance 408 388 379 Life insurance 229 228 199 Total $ 637 $ 616 $ 578 Gross future policy benefits, losses, claims and expense losses: Commercial lines insurance $ 4,179 $ 3,925 $ 3,797 Personal lines insurance 569 498 439 Excess and surplus lines insurance 241 227 202 Cincinnati Re 46 10 — Total property casualty insurance 5,035 4,660 4,438 Life insurance 2,693 2,605 2,519 Total (1) $ 7,728 $ 7,265 $ 6,957 Gross unearned premiums: Commercial lines insurance $ 1,510 $ 1,472 $ 1,441 Personal lines insurance 629 593 562 Excess and surplus lines insurance 93 87 78 Cincinnati Re 74 48 — Total property casualty insurance 2,306 2,200 2,081 Life insurance 1 1 1 Total (1) $ 2,307 $ 2,201 $ 2,082 Other policy claims and benefits payable: Commercial lines insurance $ — $ — $ — Personal lines insurance — — — Excess and surplus lines insurance — — — Cincinnati Re — — — Total property casualty insurance — — — Life insurance 28 36 25 Total (1) $ 28 $ 36 $ 25 Earned premiums: Commercial lines insurance $ 3,089 $ 2,996 $ 2,856 Personal lines insurance 1,161 1,097 1,041 Excess and surplus lines insurance 183 168 148 Cincinnati Re 49 10 — Total property casualty insurance 4,482 4,271 4,045 Life insurance 228 209 198 Total $ 4,710 $ 4,480 $ 4,243 Schedule III (continued) Cincinnati Financial Corporation and Subsidiaries Supplementary Insurance Information (Dollars in millions) Years ended December 31, 2016 2015 2014 Investment income, net of expenses: Commercial lines insurance $ — $ — $ — Personal lines insurance — — — Excess and surplus lines insurance — — — Cincinnati Re — — — Total property casualty insurance (2) 384 368 358 Life insurance 155 150 144 Total $ 539 $ 518 $ 502 Benefits, claims losses and settlement expenses: Commercial lines insurance $ 1,928 $ 1,708 $ 1,812 Personal lines insurance 840 789 740 Excess and surplus lines insurance 68 70 75 Cincinnati Re 25 5 — Total property casualty insurance 2,861 2,572 2,627 Life insurance 246 236 229 Total $ 3,107 $ 2,808 $ 2,856 Amortization of deferred policy acquisition costs: Commercial lines insurance $ 570 $ 552 $ 537 Personal lines insurance 209 210 209 Excess and surplus lines insurance 31 28 24 Cincinnati Re 10 2 — Total property casualty insurance 820 792 770 Life insurance 43 37 37 Total (3) $ 863 $ 829 $ 807 Underwriting, acquisition and insurance expenses: Commercial lines insurance $ 412 $ 395 $ 365 Personal lines insurance 128 113 84 Excess and surplus lines insurance 23 20 19 Cincinnati Re 6 1 — Total property casualty insurance 569 529 468 Life insurance 33 29 26 Total (3) $ 602 $ 558 $ 494 Net written premiums: Commercial lines insurance $ 3,122 $ 3,025 $ 2,922 Personal lines insurance 1,198 1,128 1,068 Excess and surplus lines insurance 189 175 153 Cincinnati Re 71 33 — Total property casualty insurance 4,580 4,361 4,143 Accident health insurance 2 2 3 Total $ 4,582 $ 4,363 $ 4,146 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, 2016
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, 2016 2015 2014 Gross amounts: Life insurance in force $ 95,533 $ 91,451 $ 88,045 Earned premiums Commercial lines insurance $ 3,180 $ 3,088 $ 2,973 Personal lines insurance 1,195 1,131 1,080 Excess and surplus lines insurance 192 177 156 Cincinnati Re — — — Total property casualty insurance 4,567 4,396 4,209 Life insurance 290 271 259 Total $ 4,857 $ 4,667 $ 4,468 Ceded amounts to other companies: Life insurance in force $ 38,724 $ 38,716 $ 37,689 Earned premiums Commercial lines insurance $ 98 $ 102 $ 128 Personal lines insurance 35 35 40 Excess and surplus lines insurance 9 9 8 Cincinnati Re 20 8 — Total property casualty insurance 162 154 176 Life insurance 62 62 61 Total $ 224 $ 216 $ 237 Assumed amounts from other companies: Life insurance in force $ — $ — $ — Earned premiums Commercial lines insurance $ 7 $ 10 $ 11 Personal lines insurance 1 1 1 Excess and surplus lines insurance — — — Cincinnati Re 69 18 — Total property casualty insurance 77 29 12 Life insurance — — — Total $ 77 $ 29 $ 12 Net amounts: Life insurance in force $ 56,808 $ 52,735 $ 50,356 Earned premiums Commercial lines insurance $ 3,089 $ 2,996 $ 2,856 Personal lines insurance 1,161 1,097 1,041 Excess and surplus lines insurance 183 168 148 Cincinnati Re 49 10 — Total property casualty insurance 4,482 4,271 4,045 Life insurance 228 209 198 Total $ 4,710 $ 4,480 $ 4,243 Percentage of amounts assumed to net: Life insurance in force — % — % — % Earned premiums Commercial lines insurance 0.2 % 0.3 % 0.4 % Personal lines insurance 0.1 0.1 0.1 Excess and surplus lines insurance — — — Cincinnati Re 140.8 188.0 — Total property casualty insurance 1.7 0.7 0.5 Life insurance — — — Total 1.6 0.7 0.5

Valuation And Qualifying Accoun

Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Allowance for doubtful receivables: Beginning balance, January 1 $ 4 $ 3 $ 2 Additions charged to costs and expenses 5 3 2 Deductions (4 ) (2 ) (1 ) Ending balance, December 31 $ 5 $ 4 $ 3

Supplementary Information Conce

Supplementary Information Concerning Property Casualty Insurance Operations	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Deferred policy acquisition costs: Commercial lines insurance $ 271 $ 264 $ 257 Personal lines insurance 110 103 108 Excess and surplus lines insurance 16 15 14 Cincinnati Re 11 6 — Total $ 408 $ 388 $ 379 Reserves for unpaid claims and claim adjustment expenses: Commercial lines insurance $ 4,179 $ 3,925 $ 3,797 Personal lines insurance 569 498 439 Excess and surplus lines insurance 241 227 202 Cincinnati Re 46 10 — Total $ 5,035 $ 4,660 $ 4,438 Reserve discount deducted $ — $ — $ — Gross unearned premiums: Commercial lines insurance $ 1,510 $ 1,472 $ 1,441 Personal lines insurance 629 593 562 Excess and surplus lines insurance 93 87 78 Cincinnati Re 74 48 — Total $ 2,306 $ 2,200 $ 2,081 Earned premiums: Commercial lines insurance $ 3,089 $ 2,996 $ 2,856 Personal lines insurance 1,161 1,097 1,041 Excess and surplus lines insurance 183 168 148 Cincinnati Re 49 10 — Total $ 4,482 $ 4,271 $ 4,045 Investment income, net of expenses: Commercial lines insurance $ — $ — $ — Personal lines insurance — — — Excess and surplus lines insurance — — — Cincinnati Re — — — Total (1) $ 384 $ 368 $ 358 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. Schedule VI (continued) Cincinnati Financial Corporation and Subsidiaries Supplementary Information Concerning Property Casualty Insurance Operations (Dollars in millions) Years ended December 31, 2016 2015 2014 Loss and loss expenses incurred related to current accident year: Commercial lines insurance $ 2,057 $ 1,862 $ 1,869 Personal lines insurance 844 784 752 Excess and surplus lines insurance 102 105 104 Cincinnati Re 26 5 — Total $ 3,029 $ 2,756 $ 2,725 Loss and loss expenses incurred related to prior accident years: Commercial lines insurance $ (129 ) $ (154 ) $ (57 ) Personal lines insurance (4 ) 5 (12 ) Excess and surplus lines insurance (34 ) (35 ) (29 ) Cincinnati Re (1 ) — — Total $ (168 ) $ (184 ) $ (98 ) Amortization of deferred policy acquisition costs: Commercial lines insurance $ 570 $ 552 $ 537 Personal lines insurance 209 210 209 Excess and surplus lines insurance 31 28 24 Cincinnati Re 10 2 — Total $ 820 $ 792 $ 770 Paid loss and loss expenses: Commercial lines insurance $ 1,675 $ 1,575 $ 1,666 Personal lines insurance 771 731 717 Excess and surplus lines insurance 55 43 30 Cincinnati Re 2 — — Total $ 2,503 $ 2,349 $ 2,413 Net written premiums: Commercial lines insurance $ 3,122 $ 3,025 $ 2,922 Personal lines insurance 1,198 1,128 1,068 Excess and surplus lines insurance 189 175 153 Cincinnati Re 71 33 — Total $ 4,580 $ 4,361 $ 4,143

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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 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 1,614 independent insurance agencies with 2,090 reporting locations across 41 states. In 2015, The Cincinnati Insurance Company began our reinsurance assumed operations, Cincinnati Re. 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, 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 the consolidated financial statements in conformity with GAAP requires us to make estimates and assumptions that affect amounts reported in the consolidated financial statements and accompanying notes. Our actual results could differ from those estimates.
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 capital and long-term investment horizon, our general intent is to hold fixed-maturity investments until maturity, regardless of short-term fluctuations in fair values. Impairment charges for fixed maturities are recorded for other-than-temporary declines in value if fair value is below amortized cost and, in the asset impairment committee’s judgment, the fair value is not expected to be recouped within a designated recovery period. Our invested asset impairment policy also 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 2016 and 2015 . 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, $23 million of private equity investments and $27 million of real estate through direct property ownership and development projects in the United States for the year ended 2016. 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 Fair value is defined 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 the company’s nationally recognized 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 the company’s nationally recognized pricing vendor is less than 1 percent of the fair value of our total investment portfolio. For the purpose of ASC 825 disclosure, we estimate the fair value of our long-term senior notes on market pricing of similar debt instruments that are actively trading. We estimate the fair value of our note payable on the 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, 2016 , to account for nonperformance risk. See Note 3, Fair Value Measurements, for further details.
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.
Property Casualty Insurance	Property Casualty Insurance The consolidated property casualty companies actively write property casualty insurance through independent agencies in 41 states. Our 10 largest states generated 61 percent and 62 percent of total earned premiums in 2016 and 2015 , respectively. Ohio, our largest state, accounted for 17 percent of total earned premiums in 2016 and 2015 . Illinois, Indiana, Georgia, North Carolina, Pennsylvania and Michigan each accounted for between 5 percent and 7 percent of total earned premiums in 2016 . Our largest single agency relationship accounted for less than 1 percent of our total property casualty earned premiums in 2016 . No aggregate agency relationship locations under a single ownership structure accounted for more than 4 percent of our total property casualty earned premiums in 2016 . 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. We assess recoverability of deferred acquisition costs at a 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 estimate is recorded for 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 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. We estimate that we may recover some of our costs through salvage and subrogation.
Policyholder Dividends	Policyholder Dividends Certain workers’ compensation policies include the possibility of a policyholder earning a return of a portion of 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. 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. We update our acquisition cost assumptions periodically to reflect actual experience, and we evaluate our deferred acquisition costs 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 policy reserve 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 associated with successfully acquiring 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, 2016 , the current fair value of the BOLI invested assets and cash exceeded the current fair value of the contract holders’ account value by approximately $16 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 During 2015, The Cincinnati Insurance Company expanded in the area of reinsurance assumed. Approximately half of the business written includes treaties that provide coverage for property catastrophe events on a worldwide basis. Treaties are written on a pro rata and excess of loss basis. Premiums are primarily earned on a pro rata basis over the coverage period of the treaty. We also assume risk with limited exposure as a reinsurer for other insurance companies, reinsurers and involuntary state pools. We reduce risk and uncertainty by buying property casualty reinsurance and retrocessional reinsurance as well as life reinsurance. Reinsurance and retrocessional 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. Premiums that we cede are deferred and recorded as earned premiums on a pro rata basis over the terms of the contracts. We estimate loss amounts recoverable from our reinsurers based on the reinsurance policy terms. Historically, our claims with reinsurers have been paid. We establish an insignificant allowance for uncollectible reinsurance.
Income Taxes	Income Taxes We calculate deferred income tax liabilities and assets using tax rates in effect when temporary differences in the consolidated financial statement income and taxable income are expected to reverse. We recognize deferred income taxes for numerous temporary differences between our taxable income and consolidated 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.
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.
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, internal 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 $30 million for 2016 , $36 million for 2015 and $37 million for 2014 . We review our accumulated depreciation for our building, equipment and software assets and write off fully depreciated assets for obsolesce and nonuse. 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 2016 , 2015 or 2014 .
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 as other revenues over the financing term using the effective interest method in the consolidated statements of income. Finance receivables are reviewed for impairment and are insignificant to our consolidated financial position, results of operations and cash flows.
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.
Stock-Based Compensation	Share-Based Compensation We grant qualified and nonqualified share-based compensation under authorized plans. The stock options generally vest on a graded scale 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 as well as service-based restricted stock units that vest ratably over the three -year vesting term. We also grant performance-based restricted stock units that vest if certain market conditions are attained. In 2016 , 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.
Subsequent Events	Subsequent Events There were no subsequent events requiring adjustment to the consolidated financial statements or disclosure.
New Accounting Pronouncements, Policy [Policy Text Block]	Adopted Accounting Updates 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 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did 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 may be impacted. The effective date of ASU 2015-02 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did not have a material impact on our company’s consolidated financial position, cash flows or results of operations. ASU 2015-09, Financial Services-Insurance: Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU 2015-09, Financial Services-Insurance: Disclosures About Short-Duration Contracts. ASU 2015-09 requires entities to provide additional disclosures about the liability for loss and loss expense reserves to increase the transparency of significant estimates. ASU 2015-09 also requires entities to disclose information about significant changes in methodologies and assumptions used to calculate the liability for loss and loss expense reserves, including reasons for the change and the effects on the financial statements. ASU 2015-09 also requires entities to disclose a rollforward of the liability of loss and loss expense reserves for annual and interim reporting periods. The effective date of ASU 2015-09 is for annual reporting periods beginning after December 15, 2015, and interim reporting periods beginning after December 15, 2016. The Company adopted this ASU as of December 31, 2016. The ASU did not have a material impact on our company’s financial position, cash flows or results of operations, but the ASU required additional disclosures in Note 4, Property Casualty Loss and Loss Expenses, to these consolidated financial statements and will require additional disclosure to our interim reporting periods in 2017.
Compensation Related Costs, Policy [Policy Text Block]	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 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did not have a material impact on our company’s consolidated financial position, cash flows or results of operations.
Consolidation, Policy [Policy Text Block]	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 may be impacted. The effective date of ASU 2015-02 was for interim and annual reporting periods beginning after December 15, 2015. The company adopted this ASU and it did not have a material impact on our company’s consolidated financial position, cash flows or results of operations.
Short-Duration Contracts, Policy [Policy Text Block]	ASU 2015-09, Financial Services-Insurance: Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU 2015-09, Financial Services-Insurance: Disclosures About Short-Duration Contracts. ASU 2015-09 requires entities to provide additional disclosures about the liability for loss and loss expense reserves to increase the transparency of significant estimates. ASU 2015-09 also requires entities to disclose information about significant changes in methodologies and assumptions used to calculate the liability for loss and loss expense reserves, including reasons for the change and the effects on the financial statements. ASU 2015-09 also requires entities to disclose a rollforward of the liability of loss and loss expense reserves for annual and interim reporting periods. The effective date of ASU 2015-09 is for annual reporting periods beginning after December 15, 2015, and interim reporting periods beginning after December 15, 2016. The Company adopted this ASU as of December 31, 2016. The ASU did not have a material impact on our company’s financial position, cash flows or results of operations, but the ASU required additional disclosures in Note 4, Property Casualty Loss and Loss Expenses, to these consolidated financial statements and will require additional disclosure to our interim reporting periods in 2017.
Pending Accounting Updates	Pending Accounting Updates ASU 2014-09 Revenue from Contracts with Customers In May 2014, the 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, 2017. 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 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revises the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-02, Leases (Topic 842) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting In March 2016, the FASB issued ASU 2016-07, Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement to retroactively adjust an investment, results of operations, and retained earnings once an investment qualifies for use of the equity method. It requires the equity method investor to add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting without retroactive adjustment. The effective date of ASU 2016-07 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations. ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies and improves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The effective date of ASU 2016-09 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations. ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations. ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been adopted; however, it is not expected to have a material impact on our company's consolidated financial position, cash flows or results of operations.
Revenue Recognition, Policy [Policy Text Block]	ASU 2014-09 Revenue from Contracts with Customers In May 2014, the 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, 2017. 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.
Fair Value of Financial Instruments, Policy [Policy Text Block]	ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) - Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 revises the accounting related to the classification and measurement of investments in equity securities and the presentation of certain fair value changes for financial liabilities measured at fair value. The effective date of ASU 2016-01 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations.
Lease, Policy [Policy Text Block]	ASU 2016-02, Leases (Topic 842) In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The main provision of ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under previous GAAP. The effective date of ASU 2016-02 is for interim and annual reporting periods beginning after December 15, 2018. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations.
Equity Method Investments, Policy [Policy Text Block]	ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting In March 2016, the FASB issued ASU 2016-07, Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement to retroactively adjust an investment, results of operations, and retained earnings once an investment qualifies for use of the equity method. It requires the equity method investor to add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting without retroactive adjustment. The effective date of ASU 2016-07 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations.
Share Based Compensation Payment Accounting [Policy Text Block]	ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. ASU 2016-09 simplifies and improves several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The effective date of ASU 2016-09 is for interim and annual reporting periods beginning after December 15, 2016. The ASU has not yet been adopted; however, it will not have a material impact on our company's consolidated financial position, cash flows or results of operations.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . ASU 2016-13 amends previous guidance on the impairment of financial instruments by adding an impairment model that allows an entity to recognize expected credit losses as an allowance rather than impairing as they are incurred. The new guidance is intended to reduce complexity of credit impairment models and result in a more timely recognition of expected credit losses. The effective date of ASU 2016-13 is for interim and annual reporting periods beginning after December 15, 2019. The ASU has not yet been adopted. Management is currently evaluating the impact on our company’s consolidated financial position, cash flows and results of operations.
ClassificationofCertainCashReceiptsandCashPayments [Policy Text Block]	ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . ASU 2016-15 addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice. The effective date of ASU 2016-15 is for interim and annual reporting periods beginning after December 15, 2017. The ASU has not yet been adopted; however, it is not expected to have 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, 2016
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 amortized cost Gross unrealized Fair At December 31, 2016 gains losses Fixed-maturity securities: Corporate $ 5,555 $ 252 $ 26 $ 5,781 States, municipalities and political subdivisions 3,770 100 42 3,828 Commercial mortgage-backed 282 7 2 287 Government-sponsored enterprises 167 — 3 164 Foreign government 10 — — 10 United States government 10 — — 10 Convertibles and bonds with warrants attached 5 — — 5 Subtotal 9,799 359 73 10,085 Equity securities: Common equities 2,812 2,320 9 5,123 Nonredeemable preferred equities 183 28 — 211 Subtotal 2,995 2,348 9 5,334 Total $ 12,794 $ 2,707 $ 82 $ 15,419 At December 31, 2015 Fixed-maturity securities: Corporate $ 5,294 $ 255 $ 96 $ 5,453 States, municipalities and political subdivisions 3,440 172 1 3,611 Commercial mortgage-backed 287 4 2 289 Government-sponsored enterprises 284 — 6 278 Foreign government 10 — — 10 Convertibles and bonds with warrants attached 5 — — 5 United States government 4 — — 4 Subtotal 9,324 431 105 9,650 Equity securities: Common equities 2,749 1,787 51 4,485 Nonredeemable preferred equities 189 32 — 221 Subtotal 2,938 1,819 51 4,706 Total $ 12,262 $ 2,250 $ 156 $ 14,356
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 positions: (Dollars in millions) Less than 12 months 12 months or more Total At December 31, 2016 Fair value Unrealized losses Fair value Unrealized losses Fair value Unrealized losses Fixed-maturity securities: Corporate $ 733 $ 15 $ 189 $ 11 $ 922 $ 26 States, municipalities and political subdivisions 989 42 — — 989 42 Commercial mortgage-backed 89 2 2 — 91 2 Government-sponsored enterprises 155 3 — — 155 3 United States government 6 — — — 6 — Subtotal 1,972 62 191 11 2,163 73 Equity securities: Common equities 103 9 — — 103 9 Nonredeemable preferred equities 4 — — — 4 — Subtotal 107 9 — — 107 9 Total $ 2,079 $ 71 $ 191 $ 11 $ 2,270 $ 82 At December 31, 2015 Fixed-maturity securities: Corporate $ 1,099 $ 63 $ 133 $ 33 $ 1,232 $ 96 States, municipalities and political subdivisions 47 1 22 — 69 1 Commercial mortgage-backed 103 2 2 — 105 2 Government-sponsored enterprises 100 2 127 4 227 6 Subtotal 1,349 68 284 37 1,633 105 Equity securities: Common equities 270 51 — — 270 51 Nonredeemable preferred equities 35 — — — 35 — Subtotal 305 51 — — 305 51 Total $ 1,654 $ 119 $ 284 $ 37 $ 1,938 $ 156
Contractual Maturity Dates For Fixed-Maturity And Short-Term Investments	Contractual maturity dates for fixed-maturity investments were: (Dollars in millions) Amortized cost Fair value % of fair value At December 31, 2016 Maturity dates: Due in one year or less $ 462 $ 469 4.6 % Due after one year through five years 2,974 3,135 31.1 Due after five years through ten years 3,850 3,941 39.1 Due after ten years 2,513 2,540 25.2 Total $ 9,799 $ 10,085 100.0 %
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: (Dollars in millions) Years ended December 31, 2016 2015 2014 Investment income: Interest $ 440 $ 428 $ 417 Dividends 161 150 138 Other 3 3 2 Total 604 581 557 Less investment expenses 9 9 8 Total $ 595 $ 572 $ 549 Realized investment gains and losses: Fixed maturities: Gross realized gains $ 26 $ 18 $ 21 Gross realized losses (1 ) — (3 ) Other-than-temporary impairments (2 ) (18 ) (15 ) Equity securities: Gross realized gains 152 129 136 Gross realized losses (53 ) (26 ) — Other-than-temporary impairments — (34 ) (9 ) Other 2 1 3 Total $ 124 $ 70 $ 133 Change in unrealized investment gains and losses: Fixed maturities $ (40 ) $ (263 ) $ 106 Equity securities 571 (362 ) 278 Less deferred income taxes 186 (220 ) 134 Total $ 345 $ (405 ) $ 250

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 . We do not have any liabilities carried at fair value. There were no transfers between Level 1 and Level 2. (Dollars in millions) Quoted prices in active markets for Significant unobservable At December 31, 2016 Significant other observable inputs (Level 2) Total Fixed maturities, available for sale: Corporate $ — $ 5,703 $ 78 $ 5,781 States, municipalities and political subdivisions — 3,828 — 3,828 Commercial mortgage-backed — 287 — 287 Government-sponsored enterprises — 164 — 164 Foreign government — 10 — 10 United States government 10 — — 10 Convertibles and bonds with warrants attached — 5 — 5 Subtotal 10 9,997 78 10,085 Common equities, available for sale 5,123 — — 5,123 Nonredeemable preferred equities, available for sale — 211 — 211 Separate accounts taxable fixed maturities — 750 — 750 Top Hat savings plan mutual funds and common equity (included in Other assets) 24 — — 24 Total $ 5,157 $ 10,958 $ 78 $ 16,193 At December 31, 2015 Fixed maturities, available for sale: Corporate $ — $ 5,402 $ 51 $ 5,453 States, municipalities and political subdivisions — 3,611 — 3,611 Commercial mortgage-backed — 289 — 289 Government-sponsored enterprises — 278 — 278 Foreign government — 10 — 10 Convertibles and bonds with warrants attached — 5 — 5 United States government 4 — — 4 Subtotal 4 9,595 51 9,650 Common equities, available for sale 4,485 — — 4,485 Nonredeemable preferred equities, available for sale — 218 3 221 Separate accounts taxable fixed maturities — 736 1 737 Top Hat savings plan mutual funds and common equity (included in Other assets) 21 — — 21 Total $ 4,510 $ 10,549 $ 55 $ 15,114
Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)	The following table provides the change in Level 3 assets during 2016 and 2015 : (Dollars in millions) Asset fair value measurements using significant unobservable input Corporate fixed maturities Taxable fixed maturities-separate accounts Nonredeemable preferred equities Total Beginning balance, January 1, 2016 $ 51 $ 1 $ 3 $ 55 Total gains or losses (realized/unrealized): Included in net income — — — — Included in other comprehensive income — — (1 ) (1 ) Purchases 57 — — 57 Sales (1 ) — (2 ) (3 ) Transfers into Level 3 13 — — 13 Transfers out of Level 3 (42 ) (1 ) — (43 ) Ending balance, December 31, 2016 $ 78 $ — $ — $ 78 Beginning balance, January 1, 2015 $ 18 $ — $ 2 $ 20 Total gains or losses (realized/unrealized): Included in net income — — — — Included in other comprehensive income — — 1 1 Purchases 36 1 — 37 Sales — — — — Transfers into Level 3 — — — — Transfers out of Level 3 (3 ) — — (3 ) Ending balance, December 31, 2015 $ 51 $ 1 $ 3 $ 55
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 active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Total At December 31, 2016 Life policy loans $ — $ — $ 40 $ 40 At December 31, 2015 Life policy loans $ — $ — $ 40 $ 40
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 active markets for Significant other Significant unobservable inputs (Level 3) Total At December 31, 2016 Note payable $ — $ 20 $ — $ 20 6.900% senior debentures, due 2028 — 33 — 33 6.920% senior debentures, due 2028 — 488 — 488 6.125% senior notes, due 2034 — 435 — 435 Total $ — $ 976 $ — $ 976 At December 31, 2015 Note payable $ — $ 35 $ — $ 35 6.900% senior debentures, due 2028 — 31 — 31 6.920% senior debentures, due 2028 — 480 — 480 6.125% senior notes, due 2034 — 425 — 425 Total $ — $ 971 $ — $ 971
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 active markets for identical assets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Total At December 31, 2016 Deferred annuities $ — $ — $ 839 $ 839 Structured settlements — 206 — 206 Total $ — $ 206 $ 839 $ 1,045 At December 31, 2015 Deferred annuities $ — $ — $ 886 $ 886 Structured settlements — 208 — 208 Total $ — $ 208 $ 886 $ 1,094

Property Casualty Loss And Lo37

Property Casualty Loss And Loss Expenses (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Gross loss and loss expense reserves, January 1 $ 4,660 $ 4,438 $ 4,241 Less reinsurance recoverable 281 282 299 Net loss and loss expense reserves, January 1 4,379 4,156 3,942 Net incurred loss and loss expenses related to: Current accident year 3,029 2,756 2,725 Prior accident years (168 ) (184 ) (98 ) Total incurred 2,861 2,572 2,627 Net paid loss and loss expenses related to: Current accident year 1,260 1,152 1,212 Prior accident years 1,243 1,197 1,201 Total paid 2,503 2,349 2,413 Net loss and loss expense reserves, December 31 4,737 4,379 4,156 Plus reinsurance recoverable 298 281 282 Gross loss and loss expense reserves, December 31 $ 5,035 $ 4,660 $ 4,438
Reconciliation of Property casualty Incurred Losses and ALAE and Paid Losses and ALAE Development Information	The following table provides a reconciliation of the property casualty incurred losses and allocated loss adjustment expenses (ALAE) development and paid losses and ALAE development information at December 31, 2016. (Dollars in millions) Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance Total liabilities for loss and ALAE, net of reinsurance Reinsurance recoverable on unpaid losses Total liabilities for gross loss and loss expense reserves Commercial casualty $ 4,160 $ 2,421 $ 81 $ 1,820 $ 137 $ 1,957 Workers' compensation 2,370 1,686 242 926 75 1,001 Commercial auto 1,768 1,264 12 516 5 521 Commercial property 2,187 1,910 11 288 18 306 Personal auto 1,633 1,388 4 249 31 280 Homeowner 1,452 1,322 2 132 2 134 Excess and surplus 366 144 1 223 6 229 Other short-duration insurance lines 342 Total liabilities for loss and ALAE reserves 4,770 Unallocated loss adjustment expense reserves 265 Gross loss and loss expense reserves $ 5,035
Schedule of Incurred and Paid Losses and ALAE Development by Accident Year	The following table shows the commercial auto incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 275 $ 273 $ 285 $ 288 $ 294 $ 2 43 2013 292 305 315 322 9 46 2014 333 346 351 14 51 2015 374 384 38 51 2016 417 81 49 Total $ 1,768 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 129 $ 184 $ 222 $ 258 $ 278 2013 141 199 246 285 2014 159 223 273 2015 173 244 2016 184 Total 1,264 All outstanding liabilities before 2012, net of reinsurance 12 Liabilities for loss and ALAE, net of reinsurance $ 516 The following table shows the workers’ compensation incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year Unaudited 2016 2007 $ 286 $ 281 $ 287 $ 286 $ 277 $ 279 $ 280 $ 277 277 $ 275 $ 28 — 2008 298 305 310 302 299 299 297 296 296 31 — 2009 307 278 263 238 238 235 234 234 22 27 2010 283 274 248 242 240 239 240 26 26 2011 284 251 246 242 239 236 26 24 2012 265 245 234 220 213 29 21 2013 264 246 221 212 34 20 2014 261 233 214 48 19 2015 246 220 83 17 2016 230 106 14 Total $ 2,370 Cumulative paid losses and ALAE, net of reinsurance 2007 $ 67 $ 145 $ 185 $ 206 $ 219 $ 226 $ 230 $ 233 $ 237 $ 238 2008 72 155 195 217 233 242 247 251 254 2009 65 132 163 179 188 193 198 201 2010 67 134 164 181 192 198 202 2011 65 131 161 177 186 190 2012 62 121 147 162 171 2013 61 119 144 157 2014 56 110 134 2015 47 93 2016 46 Total 1,686 All outstanding liabilities before 2007, net of reinsurance 242 Liabilities for loss and ALAE, net of reinsurance $ 926 The following table shows the commercial casualty incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred but not reported liabilities plus expected development on reported losses Cumulative number of reported claims Years ended December 31, Accident 2007 2008 2009 2010 2011 2012 2013 2014 2015 Year Unaudited 2016 2007 $ 509 $ 447 $ 412 $ 379 $ 352 $ 334 $ 328 $ 338 $ 333 $ 341 $ 5 — 2008 516 458 409 387 362 359 357 357 355 10 — 2009 484 409 412 360 370 365 357 357 21 20 2010 495 394 378 349 347 348 349 31 20 2011 466 404 377 377 375 380 37 19 2012 466 414 417 394 394 48 18 2013 448 443 431 416 96 19 2014 503 496 479 128 20 2015 533 526 225 19 2016 563 337 15 Total $ 4,160 Cumulative paid losses and ALAE, net of reinsurance 2007 $ 29 $ 92 $ 145 $ 200 $ 248 $ 275 $ 290 309 $ 314 $ 324 2008 31 93 158 212 262 293 315 325 331 2009 27 75 151 213 267 295 310 322 2010 33 92 159 203 256 285 300 2011 27 93 149 227 266 298 2012 27 88 170 232 288 2013 35 90 159 232 2014 34 97 172 2015 38 108 2016 46 Total 2,421 All outstanding liabilities before 2007, net of reinsurance 81 Liabilities for loss and ALAE, net of reinsurance $ 1,820 The following table shows the personal auto incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 260 $ 265 $ 269 $ 270 $ 271 $ — 89 2013 280 280 293 298 — 96 2014 317 317 325 — 104 2015 343 356 12 108 2016 383 38 104 Total $ 1,633 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 174 $ 223 $ 250 $ 262 $ 268 2013 190 245 272 287 2014 210 267 298 2015 229 292 2016 243 Total 1,388 All outstanding liabilities before 2012, net of reinsurance 4 Liabilities for loss and ALAE, net of reinsurance $ 249 The following table shows the commercial property incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 403 $ 389 $ 388 $ 383 $ 386 $ — 16 2013 389 359 352 356 2 14 2014 452 444 441 — 17 2015 454 414 5 16 2016 590 38 16 Total $ 2,187 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 255 $ 356 $ 376 $ 380 $ 383 2013 227 330 344 349 2014 297 412 432 2015 279 388 2016 358 Total 1,910 All outstanding liabilities before 2012, net of reinsurance 11 Liabilities for loss and ALAE, net of reinsurance $ 288 The following table shows the homeowner incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2012 2013 2014 2015 Year Unaudited 2016 2012 $ 344 $ 330 $ 328 $ 330 $ 329 $ — 33 2013 252 246 247 247 — 25 2014 297 283 286 — 26 2015 284 275 3 23 2016 315 29 21 Total $ 1,452 Cumulative paid losses and ALAE, net of reinsurance 2012 $ 256 $ 317 $ 324 $ 328 $ 329 2013 180 236 242 244 2014 224 273 281 2015 203 260 2016 208 Total 1,322 All outstanding liabilities before 2012, net of reinsurance 2 Liabilities for loss and ALAE, net of reinsurance $ 132 The following table shows the excess and surplus incurred and paid losses and ALAE development by accident year. The table also shows the IBNR reserves plus expected development on reported losses and claim frequency: (Dollars in millions, reported claims in thousands) As of December 31, 2016 Incurred losses and ALAE, net of reinsurance Total of incurred Cumulative number of reported claims Years ended December 31, Accident 2011 2012 2013 2014 2015 Year Unaudited 2016 2011 $ 48 $ 47 $ 44 $ 38 $ 36 $ 35 $ — 1 2012 67 56 49 40 37 2 1 2013 74 64 54 45 9 2 2014 95 82 75 26 2 2015 96 81 40 2 2016 93 54 2 Total $ 366 Cumulative paid losses and ALAE, net of reinsurance 2011 $ 8 $ 14 $ 23 $ 27 $ 30 $ 32 2012 9 15 19 25 29 2013 7 12 20 27 2014 9 17 27 2015 8 19 2016 10 Total 144 All outstanding liabilities before 2011, net of reinsurance 1 Liabilities for loss and ALAE, net of reinsurance $ 223
Schedule of Average Annual Percentage Payout of Incurred Claims	The following table shows the average annual percentage payout of incurred losses for the commercial casualty line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 9 10 Average annual percentage payout 8.0% 15.4% 17.7% 16.5% 13.8% 8.3% 4.7% 4.0% 1.5% 2.9% The following table shows the average annual percentage payout of incurred losses for the homeowner line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 73.8% 19.7% 2.6% 1.0% 0.3% The following table shows the average annual percentage payout of incurred losses for the workers’ compensation line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 7 8 9 10 Average annual percentage payout 25.7% 26.9% 12.7% 7.1% 4.4% 2.4% 1.6% 1.4% 1.2% 0.5% The following table shows the average annual percentage payout of incurred losses for the personal auto line of business. Personal auto includes both physical damage and liability losses. A majority of the incurred losses paid after year 2 are the result of liability losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 64.0% 17.9% 9.6% 4.8% 2.0% The following table shows the average annual percentage payout of incurred losses for the commercial property line of business: Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 65.0% 26.8% 4.6% 1.2% 0.9% The following table shows the average annual percentage payout of incurred losses for the commercial auto line of business. Commercial auto includes both physical damage and liability losses. A majority of the incurred losses paid after year 2 are the result of liability losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 Average annual percentage payout 44.4% 18.4% 13.9% 12.2% 6.9% The following table shows the average annual percentage payout of incurred losses for the excess and surplus lines insurance segment. Excess and surplus lines consist mostly of commercial casualty and commercial property coverages. A majority of the incurred losses paid after year 2 are the result of commercial casualty losses. Average annual percentage payout of incurred losses by age, net of reinsurance (unaudited) Years 1 2 3 4 5 6 Average annual percentage payout 15.9% 13.5% 17.4% 13.5% 9.9% 7.4%

Life Policy And Investment Co38

Life Policy And Investment Contract Reserves (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Life policy reserves: Ordinary/traditional life $ 1,011 $ 943 Other 45 44 Subtotal 1,056 987 Investment contract reserves: Deferred annuities 861 860 Universal life 578 558 Structured settlements 170 174 Other 6 4 Subtotal 1,615 1,596 Total life policy and investment contract reserves $ 2,671 $ 2,583

Deferred Policy Acquisition C39

Deferred Policy Acquisition Costs (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Property casualty: Deferred policy acquisition costs asset, January 1 $ 388 $ 379 $ 366 Capitalized deferred policy acquisition costs 840 801 783 Amortized deferred policy acquisition costs (820 ) (792 ) (770 ) Deferred policy acquisition costs asset, December 31 $ 408 $ 388 $ 379 Life: Deferred policy acquisition costs asset, January 1 $ 228 $ 199 $ 199 Capitalized deferred policy acquisition costs 49 45 44 Amortized deferred policy acquisition costs (43 ) (37 ) (37 ) Amortized shadow deferred policy acquisition costs (5 ) 21 (7 ) Deferred policy acquisition costs asset, December 31 $ 229 $ 228 $ 199 Consolidated: Deferred policy acquisition costs asset, January 1 $ 616 $ 578 $ 565 Capitalized deferred policy acquisition costs 889 846 827 Amortized deferred policy acquisition costs (863 ) (829 ) (807 ) Amortized shadow deferred policy acquisition costs (5 ) 21 (7 ) Deferred policy acquisition costs asset, December 31 $ 637 $ 616 $ 578

Long-Term Debt And Capital Le40

Long-Term Debt And Capital Lease Obligation (Tables)	12 Months Ended
	Dec. 31, 2016
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 issue At December 31, At December 31, 2016 2015 2016 2015 6.900% 1998 Senior debentures, due 2028 $ 26 $ 26 $ 28 $ 28 6.920% 2005 Senior debentures, due 2028 391 391 391 391 6.125% 2004 Senior notes, due 2034 370 369 374 374 Total $ 787 $ 786 $ 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, 2017 2018 2019 2020 2021 2022 Capital lease obligations $ 12 $ 10 $ 7 $ 5 $ 3 $ 2

Shareholders' Equity And Divi41

Shareholders' Equity And Dividend Restrictions (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2014 Before tax Income tax Net Before Income Net Before Income Net Investments: AOCI, January 1 $ 2,094 $ 722 $ 1,372 $ 2,719 $ 942 $ 1,777 $ 2,335 $ 808 $ 1,527 OCI before realized gains recognized in net income 653 229 424 (556 ) (196 ) (360 ) 514 181 333 Realized gains recognized in net income (122 ) (43 ) (79 ) (69 ) (24 ) (45 ) (130 ) (47 ) (83 ) OCI 531 186 345 (625 ) (220 ) (405 ) 384 134 250 AOCI, December 31 $ 2,625 $ 908 $ 1,717 $ 2,094 $ 722 $ 1,372 $ 2,719 $ 942 $ 1,777 Pension obligations: AOCI, January 1 $ (42 ) $ (14 ) $ (28 ) $ (36 ) $ (12 ) $ (24 ) $ (18 ) $ (6 ) $ (12 ) OCI excluding amortization recognized in net income 13 5 8 (12 ) (5 ) (7 ) (21 ) (7 ) (14 ) Amortization recognized in net income 3 1 2 6 3 3 3 1 2 OCI 16 6 10 (6 ) (2 ) (4 ) (18 ) (6 ) (12 ) AOCI, December 31 $ (26 ) $ (8 ) $ (18 ) $ (42 ) $ (14 ) $ (28 ) $ (36 ) $ (12 ) $ (24 ) Life deferred acquisition costs, life policy reserves and other: AOCI, January 1 $ 1 $ 1 $ — $ (12 ) $ (3 ) $ (9 ) $ (16 ) $ (5 ) $ (11 ) OCI before realized gains recognized in net income (8 ) (3 ) (5 ) 14 5 9 7 3 4 Realized gains recognized in net income (2 ) (1 ) (1 ) (1 ) (1 ) — (3 ) (1 ) (2 ) OCI (10 ) (4 ) (6 ) 13 4 9 4 2 2 AOCI, December 31 $ (9 ) $ (3 ) $ (6 ) $ 1 $ 1 $ — $ (12 ) $ (3 ) $ (9 ) Summary of AOCI: AOCI, January 1 $ 2,053 $ 709 $ 1,344 $ 2,671 $ 927 $ 1,744 $ 2,301 $ 797 $ 1,504 Investments OCI 531 186 345 (625 ) (220 ) (405 ) 384 134 250 Pension obligations OCI 16 6 10 (6 ) (2 ) (4 ) (18 ) (6 ) (12 ) Life deferred acquisition costs, life policy reserves and other OCI (10 ) (4 ) (6 ) 13 4 9 4 2 2 Total OCI 537 188 349 (618 ) (218 ) (400 ) 370 130 240 AOCI, December 31 $ 2,590 $ 897 $ 1,693 $ 2,053 $ 709 $ 1,344 $ 2,671 $ 927 $ 1,744

Reinsurance (Tables)

Reinsurance (Tables)	12 Months Ended
	Dec. 31, 2016
Reinsurance Disclosures [Abstract]
Property Casualty Insurance Premiums Written On Assumed And Ceded Business [Table Text Block]	The table below includes our net written consolidated property casualty insurance premiums on assumed and ceded business: (Dollars in millions) Years ended December 31, 2016 2015 2014 Direct written premiums $ 4,646 $ 4,461 $ 4,309 Assumed written premiums 103 77 11 Ceded written premiums (169 ) (177 ) (177 ) Net written premiums $ 4,580 $ 4,361 $ 4,143
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, 2016 2015 2014 Direct earned premiums $ 4,567 $ 4,396 $ 4,209 Assumed earned premiums 77 29 12 Ceded earned premiums (162 ) (154 ) (176 ) Earned premiums $ 4,482 $ 4,271 $ 4,045
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, 2016 2015 2014 Direct incurred loss and loss expenses $ 2,874 $ 2,596 $ 2,661 Assumed incurred loss and loss expenses 43 12 6 Ceded incurred loss and loss expenses (56 ) (36 ) (40 ) Incurred loss and loss expenses $ 2,861 $ 2,572 $ 2,627
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, 2016 2015 2014 Direct earned premiums $ 290 $ 271 $ 259 Ceded earned premiums (62 ) (62 ) (61 ) Earned premiums $ 228 $ 209 $ 198
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, 2016 2015 2014 Direct contract holders' benefits incurred $ 303 $ 292 $ 299 Ceded contract holders' benefits incurred (57 ) (56 ) (70 ) Contract holders' benefits incurred $ 246 $ 236 $ 229

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 Deferred tax assets: Loss and loss expense reserves $ 199 $ 191 Unearned premiums 158 151 Investments 5 25 Other 52 42 Total gross deferred tax assets 414 409 Deferred tax liabilities: Unrealized investment gains, net 907 719 Deferred acquisition costs 195 187 Life policy reserves 162 137 Other 15 4 Total gross deferred tax liabilities 1,279 1,047 Net deferred income tax liability $ 865 $ 638
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, 2016 2015 2014 Tax at statutory rate: $ 284 35.0 % $ 308 35.0 % $ 252 35.0 % Increase (decrease) resulting from: Tax-exempt income from municipal bonds (34 ) (4.2 ) (33 ) (3.7 ) (33 ) (4.6 ) Dividend received exclusion (33 ) (4.1 ) (32 ) (3.6 ) (29 ) (4.0 ) Other 4 0.5 4 0.3 6 0.8 Provision for income taxes $ 221 27.2 % $ 247 28.0 % $ 196 27.2 %

Net Income Per Common Share (Ta

Net Income Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 Numerator: Net income—basic and diluted $ 591 $ 634 $ 525 Denominator: Basic weighted-average common shares outstanding 164.5 164.0 163.5 Effect of share-based awards: Stock options 1.1 1.0 1.0 Nonvested shares 0.9 0.6 0.6 Diluted weighted-average shares 166.5 165.6 165.1 Earnings per share: Basic $ 3.59 $ 3.87 $ 3.21 Diluted 3.55 3.83 3.18 Number of anti-dilutive share-based awards 0.3 0.4 0.7

Employee Retirement Benefits (T

Employee Retirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2016
Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP	Benefit obligation activity using an actuarial measurement date for our qualified pension plan and SERP at December 31 follows: (Dollars in millions) At December 31, 2016 2015 Change in projected benefit obligation: Benefit obligation, January 1 $ 323 $ 319 Service cost 11 12 Interest cost 14 14 Actuarial loss (gain) 13 (3 ) Benefits paid (21 ) (19 ) Projected benefit obligation, December 31 $ 340 $ 323 Change in plan assets: Fair value of plan assets, January 1 $ 278 $ 288 Actual return on plan assets 45 3 Employer contribution 13 6 Benefits paid (21 ) (19 ) Fair value of plan assets, December 31 $ 315 $ 278 Funded status, December 31 $ (25 ) $ (45 ) Accumulated benefit obligation $ 309 $ 293
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, 2016 2015 Pension amounts recognized in the consolidated balance sheets: Other liabilities $ (25 ) $ (45 ) Total $ (25 ) $ (45 ) Pension amounts recognized in accumulated other comprehensive income: Net actuarial loss $ 26 $ 41 Prior service cost — 1 Total $ 26 $ 42
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, 2016 2015 2014 Net periodic benefit cost: Service cost $ 11 $ 12 $ 10 Interest cost 14 14 15 Expected return on plan assets (19 ) (18 ) (17 ) Amortization of actuarial loss and prior service cost 3 6 2 Other — 1 3 Net periodic benefit cost $ 9 $ 15 $ 13 (Dollars in millions) Years ended December 31, 2016 2015 2014 Other changes in plan assets and benefit obligations recognized in other comprehensive income: Current year actuarial (gain) loss $ (13 ) $ 13 $ 21 Amortization of actuarial loss (2 ) (6 ) (5 ) Current year prior service cost — — 2 Amortization of prior service cost (1 ) (1 ) — Total recognized in other comprehensive (income) loss $ (16 ) $ 6 $ 18
Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis	(Dollars in millions) Quoted prices in Significant other Significant (Level 3) Total At December 31, 2016 Fixed maturities, available for sale: States, municipalities and political subdivisions $ — $ 31 $ — $ 31 Corporate securities — 20 — 20 Total fixed maturities, available for sale — 51 — 51 Common equities, available for sale 253 — — 253 Total $ 253 $ 51 $ — $ 304 At December 31, 2015 Fixed maturities, available for sale: States, municipalities and political subdivisions $ — $ 32 $ — $ 32 Corporate securities — 13 — 13 Total fixed maturities, available for sale — 45 — 45 Common equities, available for sale 212 — — 212 Total $ 212 $ 45 $ — $ 257
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, 2017 2018 2019 2020 2021 2022 - 2026 Expected future benefit payments $ 34 $ 23 $ 24 $ 26 $ 28 $ 148
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 2016 2015 2016 2015 Discount rate 4.30 % 4.55 % 4.10 % 4.30 % 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 periodic benefit cost for the plans: Qualified Pension Plan SERP 2016 2015 2014 2016 2015 2014 Discount rate 4.55 % 4.25 % 5.15 % 4.30 % 4.05 % 4.80 % Expected return on plan assets 7.25 7.25 7.25 n/a n/a n/a Rate of compensation increase 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25 2.75-3.25

Statutory Accounting Informat46

Statutory Accounting Information (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 2015 2014 2016 2015 The Cincinnati Insurance Company $ 434 $ 534 $ 436 $ 4,686 $ 4,412 The Cincinnati Casualty Company 11 12 12 360 337 The Cincinnati Indemnity Company 4 3 3 93 88 The Cincinnati Specialty Underwriters Insurance Company 57 49 32 372 306 The Cincinnati Life Insurance Company 2 (11 ) (19 ) 200 208

Share-Based Associate Compens47

Share-Based Associate Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Option Information	is a summary of option information for the year 2016: (Dollars in millions, shares in thousands) Shares Weighted- exercise price Aggregate Weighted-average Outstanding option shares at January 1, 2016 3,872 $ 39.78 Granted 359 61.47 Exercised (863 ) 38.64 Forfeited or expired (356 ) 44.66 Outstanding option shares at December 31, 2016 3,012 42.12 $ 101 5.05 years Options exercisable at end of period 2,319 $ 38.01 $ 88 4.04 years
Restricted Stock Unit Information	Below is a summary of service-based and performance-based share information, assuming a target payout for performance-based shares, for the year 2016 : (Shares in thousands) Service-based Weighted- Performance-based Weighted- Nonvested at January 1, 2016 902 $ 43.15 256 $ 42.35 Granted 323 56.39 68 70.68 Vested (313 ) 40.99 (25 ) 44.82 Forfeited or canceled (24 ) 48.31 (63 ) 44.82 Nonvested at December 31, 2016 888 48.59 236 49.64
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumptions Used In Option Grants Issued	The following weighted average assumptions were used in determining fair value for option grants issued: 2016 2015 2014 Weighted-average expected term 8 years 8-9 years 8-9 years Expected volatility 24.88-25.75% 25.04-26.15% 25.20-26.22% Dividend yield 2.58-3.12% 3.52% 3.76% Risk-free rates 1.44-1.60% 1.94-2.01% 2.42-2.62% Weighted-average fair value of options granted during the period $13.21 $11.15 $10.16
Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumptions Used In Option Grants Issued	The following assumptions were used in determining fair value for performance-based grants issued: 2016 2015 2014 Expected term 2.44-2.88 years 2.88 years 2.88 years Expected volatility 15.42-33.64% 13.78-34.69% 18.69-41.21% Dividend yield 2.58-3.12% 3.52% 3.74% Risk-free rates 0.77-0.87% 0.99% 0.66%

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2016
Segment Reporting [Abstract]
Segment Information	egment information is summarized in the following table: (Dollars in millions) Years ended December 31, 2016 2015 2014 Revenues: Commercial lines insurance Commercial casualty $ 1,050 $ 1,010 $ 938 Commercial property 867 815 728 Commercial auto 594 561 528 Workers' compensation 354 367 370 Other commercial 224 243 292 Commercial lines insurance premiums 3,089 2,996 2,856 Fee revenues 5 4 4 Total commercial lines insurance 3,094 3,000 2,860 Personal lines insurance Personal auto 543 506 476 Homeowner 486 463 443 Other personal 132 128 122 Personal lines insurance premiums 1,161 1,097 1,041 Fee revenues 4 3 2 Total personal lines insurance 1,165 1,100 1,043 Excess and surplus lines insurance 183 168 148 Fee revenues 1 1 — Total excess and surplus lines insurance 184 169 148 Life insurance premiums 228 209 198 Fee revenues 5 5 6 Total life insurance 233 214 204 Investments Investment income, net of expenses 595 572 549 Realized investment gains, net 124 70 133 Total investment revenue 719 642 682 Other Cincinnati Re insurance premiums 49 10 — Other 5 7 8 Total other revenue 54 17 8 Total revenues $ 5,449 $ 5,142 $ 4,945 Income (loss) before income taxes: Insurance underwriting results Commercial lines insurance $ 184 $ 345 $ 146 Personal lines insurance (12 ) (12 ) 10 Excess and surplus lines insurance 62 51 30 Life insurance 1 (2 ) (5 ) Investments 629 556 599 Other (52 ) (57 ) (59 ) Total income before income taxes $ 812 $ 881 $ 721 December 31, December 31, Identifiable assets: 2016 2015 Property casualty insurance $ 2,967 $ 2,717 Life insurance 1,366 1,325 Investments 15,569 14,485 Other 484 361 Total $ 20,386 $ 18,888

Quarterly Supplementary Data (T

Quarterly Supplementary Data (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Unaudited Quarterly Financial Information	This table includes unaudited quarterly financial information for the years ended December 31, 2016 and 2015 : (Dollars in millions except per share data) Quarter 1st 2nd 3rd 4th Full year 2016 Revenues $ 1,364 $ 1,371 $ 1,402 $ 1,312 $ 5,449 Income before income taxes 265 166 253 128 812 Net income 188 123 180 100 591 Net income per common share—basic 1.14 0.75 1.09 0.61 3.59 Net income per common share—diluted 1.13 0.74 1.08 0.60 3.55 2015 Revenues $ 1,285 $ 1,316 $ 1,278 $ 1,263 $ 5,142 Income before income taxes 174 248 243 216 881 Net income 128 176 174 156 634 Net income per common share—basic 0.78 1.07 1.06 0.95 3.87 Net income per common share—diluted 0.77 1.06 1.05 0.94 3.83

Summary Of Significant Accoun50

Summary Of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2016USD ($)statesubsidiaryindependent_insurance_agencyreporting_locations	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2008
Significant Accounting Policies
Income Tax Examination, Penalties Expense	$ 0
Number of operating subsidaries | subsidiary	2
Number of independent insurance agencies | independent_insurance_agency	1,614
Number of reporting locations | reporting_locations	2,090
Number of states in which entity operates | state	41
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	$ 16,000,000
Other invested assets	81,000,000	$ 67,000,000
Depreciation expense	30,000,000	36,000,000	$ 37,000,000
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	$ 31,000,000
Venture Capital Funds
Significant Accounting Policies
Other invested assets	23,000,000
Real Estate Properties [Domain]
Significant Accounting Policies
Other invested assets	$ 27,000,000
10 Largest States
Significant Accounting Policies
Generated percentage of total earned premiums	61.00%	62.00%
Ohio, Largest State
Significant Accounting Policies
Generated percentage of total earned premiums	0.00%	17.00%
Indiana, Illinois, Pennsylvania, Georgia, Michigan and North Carolina | Minimum
Significant Accounting Policies
Generated percentage of total earned premiums	0.00%
Indiana, Illinois, Pennsylvania, Georgia, Michigan and North Carolina | Maximum
Significant Accounting Policies
Generated percentage of total earned premiums	0.00%
Largest Single Agency Relationship
Significant Accounting Policies
Generated percentage of total earned premiums	0.00%
All Other | Maximum
Significant Accounting Policies
Generated percentage of total earned premiums	0.00%
Stock Options
Significant Accounting Policies
Weighted-average remaining contractual life for options expected to vest	10 years
Property Casualty Insurance Segment
Significant Accounting Policies
Number of operating subsidaries | subsidiary	2
Stock Options
Significant Accounting Policies
Awards vesting period	3 years
Restricted Stock Units (RSUs)
Significant Accounting Policies
Awards vesting period	3 years

Investments (Narrative) (Detail

Investments (Narrative) (Details) $ in Millions	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Gain (Loss) on Investments
Largest equity holdings to total equity portfolio	3.80%
Largest equity holdings to total portfolio	1.30%
Investments, deposit with various states	$ 70	$ 74
Investments in fair value, deposit with various states	$ 16,193	$ 15,114
Impaired securities	4	20	6
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, aggregate loss	$ 11	$ 37	$ 10
Fixed Maturities
Gain (Loss) on Investments
Number of securities total unrealized loss in an unrealized loss position for 12 months or more	32	69	144
Number of securities below 70 percent of amortized cost	0	5	0
Equity Securities
Gain (Loss) on Investments
Number of securities total unrealized loss in an unrealized loss position for 12 months or more	0	0	3
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	$ 698
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	$ 72	$ 77

Investments (Analysis Of Cost O

Investments (Analysis Of Cost Or Amortized Cost Gross Unrealized Gains And Losses And Fair Value For Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fixed Maturities
Schedule of Available-for-sale Securities
Cost or amortized cost	$ 9,799	$ 9,324
Gross unrealized gains	359	431
Gross unrealized losses	73	105
Fair value	10,085	9,650
Fixed Maturities | Corporate Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	5,555	5,294
Gross unrealized gains	252	255
Gross unrealized losses	26	96
Fair value	5,781	5,453
Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Available-for-sale Securities
Cost or amortized cost	3,770	3,440
Gross unrealized gains	100	172
Gross unrealized losses	42	1
Fair value	3,828	3,611
Fixed Maturities | Commercial Mortgage Backed Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	282	287
Gross unrealized gains	7	4
Gross unrealized losses	2	2
Fair value	287	289
Fixed Maturities | Government-Sponsored Enterprises
Schedule of Available-for-sale Securities
Cost or amortized cost	167	284
Gross unrealized gains	0	0
Gross unrealized losses	3	6
Fair value	164	278
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	10	5
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	10	5
Fixed Maturities | United States Government
Schedule of Available-for-sale Securities
Cost or amortized cost	5	4
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair value	5	4
Equity Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	2,995	2,938
Gross unrealized gains	2,348	1,819
Gross unrealized losses	9	51
Fair value	5,334	4,706
Equity Securities | Common Equities
Schedule of Available-for-sale Securities
Cost or amortized cost	2,812	2,749
Gross unrealized gains	2,320	1,787
Gross unrealized losses	9	51
Fair value	5,123	4,485
Equity Securities | Nonredeemable Preferred Equities
Schedule of Available-for-sale Securities
Cost or amortized cost	183	189
Gross unrealized gains	28	32
Gross unrealized losses	0	0
Fair value	211	221
Fixed Maturities And Equity Securities
Schedule of Available-for-sale Securities
Cost or amortized cost	12,794	12,262
Gross unrealized gains	2,707	2,250
Gross unrealized losses	82	156
Fair value	$ 15,419	$ 14,356

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 ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Investments, Unrealized Loss Position
Less than 12 months fair value	$ 2,079	$ 1,654
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	71	119
12 months or more fair value	191	284
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	37
Total fair value	2,270	1,938
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	82	156
Fixed Maturities
Investments, Unrealized Loss Position
Less than 12 months fair value	1,972	1,349
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	62	68
12 months or more fair value	191	284
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	37
Total fair value	2,163	1,633
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	73	105
Fixed Maturities | Corporate Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	733	1,099
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	15	63
12 months or more fair value	189	133
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11	33
Total fair value	922	1,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	26	96
Fixed Maturities | States, Municipalities and Political Subdivisions
Investments, Unrealized Loss Position
Less than 12 months fair value	989	47
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	42	1
12 months or more fair value	0	22
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	989	69
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	42	1
Fixed Maturities | Commercial Mortgage Backed Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	89	103
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	2
12 months or more fair value	2	2
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	91	105
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	2	2
Fixed Maturities | Government-Sponsored Enterprises
Investments, Unrealized Loss Position
Less than 12 months fair value	155	100
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	2
12 months or more fair value	0	127
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	4
Total fair value	155	227
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	3	6
Fixed Maturities | United States Government
Investments, Unrealized Loss Position
Less than 12 months fair value	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0
12 months or more fair value	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Total fair value	6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	0
Equity Securities
Investments, Unrealized Loss Position
Less than 12 months fair value	107	305
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9	51
12 months or more fair value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	107	305
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	9	51
Equity Securities | Common Equities
Investments, Unrealized Loss Position
Less than 12 months fair value	103	270
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9	51
12 months or more fair value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	103	270
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	9	51
Equity Securities | Nonredeemable Preferred Equities
Investments, Unrealized Loss Position
Less than 12 months fair value	4	35
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	0
12 months or more fair value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Total fair value	4	35
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 0

Investments (Contractual Maturi

Investments (Contractual Maturity Dates For Fixed-Maturity And Short-Term Investments) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Amortized cost
Due in one year or less	$ 462
Due after one year through five years	2,974
Due after five years through ten years	3,850
Due after ten years	2,513
Total	9,799	$ 9,324
Fair value
Due in one year or less	469
Due after one year through five years	3,135
Due after five years through ten years	3,941
Due after ten years	2,540
Total	$ 10,085	$ 9,650
% of fair value
Due in one year or less	4.60%
Due after one year through five years	31.10%
Due after five years through ten years	39.10%
Due after ten years	25.20%
Total	100.00%

Investments (Investment Income

Investments (Investment Income Realized Investment Gains And Losses And Change In Unrealized Investment Gains And Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investment income:
Interest	$ 440	$ 428	$ 417
Dividends	161	150	138
Other	3	3	2
Total	604	581	557
Less investment expenses	9	9	8
Total	595	572	549
Realized investment gains and losses:
Other	2	1	3
Total	124	70	133
Change in unrealized investment gains and losses:
Unrealized gains and (losses) on investments available for sale	345	(405)	250
OCI, portion attributable to Parent	188	(218)	130
OCI, portion attributable to Parent	537	(618)	370
Fixed Maturities
Realized investment gains and losses:
Gross realized gains	26	18	21
Gross realized losses	(1)	0	(3)
Other-than-temporary impairments	(2)	(18)	(15)
Change in unrealized investment gains and losses:
Unrealized gains and (losses) on investments available for sale	(40)	(263)	106
Equity Securities
Realized investment gains and losses:
Gross realized gains	152	129	136
Gross realized losses	(53)	(26)	0
Other-than-temporary impairments	0	(34)	(9)
Change in unrealized investment gains and losses:
Unrealized gains and (losses) on investments available for sale	571	(362)	278
Accumulated Net Unrealized Investment Gain (Loss)
Change in unrealized investment gains and losses:
OCI, portion attributable to Parent	186	(220)	134
OCI, portion attributable to Parent	$ 345	$ (405)	$ 250

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
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	51	62
Reserves for structured settlements	$ 5,085	$ 4,718
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	$ 31
Deferred Annuities and Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Recorded reserves for the deferred annuities	861	860
Reserves for structured settlements	$ 170	$ 174

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Hierarchy For Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	$ 10,085	$ 9,650
Available for sale securities, equity securities	5,334	4,706
Separate accounts taxable fixed maturities	766	748
Total	16,193	15,114
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 equity (included in Other assets)	24	21
Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	10,085	9,650
Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	5,781	5,453
Fixed Maturities | States, Municipalities and Political Subdivisions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	3,828	3,611
Fixed Maturities | Commercial Mortgage Backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	287	289
Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	164	278
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	5	5
Fixed Maturities | United States Government
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	10	4
Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	5,123	4,485
Equity Securities | Nonredeemable Preferred Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	211	221
Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	750	737
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Total	5,157	4,510
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 equity (included in Other assets)	24	21
Level 1 | Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	10	4
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	10	4
Level 1 | Equity Securities | Common Equities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, equity securities	5,123	4,485
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
Total	10,958	10,549
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 equity (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	9,997	9,595
Level 2 | Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	5,703	5,402
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	3,828	3,611
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	287	289
Level 2 | Fixed Maturities | Government-Sponsored Enterprises
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	164	278
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	5	5
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	211	218
Level 2 | Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	750	736
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Total	78	55
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 equity (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	78	51
Level 3 | Fixed Maturities | Corporate Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Available for sale securities, debt securities	78	51
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	0	3
Level 3 | Taxable Fixed Maturities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Separate accounts taxable fixed maturities	$ 0	$ 1

Fair Value Measurements (Asset

Fair Value Measurements (Asset Fair Value Measurements Using Significant Unobservable Inputs (Level 3)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	$ 55	$ 20
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	(1)	1
Purchases	57	37
Sales	(3)	0
Transfers into Level 3	13	0
Transfers out of Level 3	(43)	(3)
Ending balance	78	55
Corporate Fixed Maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	51	18
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	0	0
Purchases	57	36
Sales	(1)	0
Transfers into Level 3	13	0
Transfers out of Level 3	(42)	(3)
Ending balance	78	51
Taxable Fixed Maturities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	1	0
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	(1)	0
Ending balance	0	1
Nonredeemable Preferred Equities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Beginning balance	3	2
Total gains or losses (realized/unrealized):
Included in net income	0	0
Included in other comprehensive income	(1)	1
Purchases	0	0
Sales	(2)	0
Transfers into Level 3	0	0
Transfers out of Level 3	0	0
Ending balance	$ 0	$ 3

Fair Value Measurements (Fair59

Fair Value Measurements (Fair Value of Note Payable and Long-Term Debt) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of note payable	$ 20	$ 35
Total	976	971
6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	$ 33	$ 31
Interest rate	6.90%	6.90%
Debt instrument, year of maturity	2,028	2,028
6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	$ 488	$ 480
Interest rate	6.92%	6.92%
Debt instrument, year of maturity	2,028	2,028
6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	$ 435	$ 425
Interest rate	6.125%	6.125%
Debt instrument, year of maturity	2,034	2,034
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	20	35
Total	976	971
Level 2 | 6.900% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	33	31
Level 2 | 6.920% Senior Debentures, Due 2028
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	488	480
Level 2 | 6.125% Senior Notes, Due 2034
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of senior debt	435	425
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 (Fair60

Fair Value Measurements (Fair Value of Life Policy) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of life policy loans	$ 40	$ 40
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	$ 40	$ 40

Fair Value Measurements (Fair61

Fair Value Measurements (Fair Value Of Deferred Annuities, Structured Settlements And Other Items) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	$ 1,045	$ 1,094
Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	839	886
Structured Settlements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	206	208
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	206	208
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	206	208
Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	839	886
Level 3 | Deferred Annuities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis
Fair value of deferred annuities and structured settlements	839	886
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 Lo62

Property Casualty Loss And Loss Expenses (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	$ 5,035,000,000	$ 4,660,000,000	$ 4,438,000,000	$ 4,241,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(168,000,000)	(184,000,000)	(98,000,000)
Recovery of liability for unpaid claims and claims adjustment expense incurred prior years		(86,000,000)
Increase in (favorable) reserve developement on prior accident			(49,000,000)
Net loss and loss expense reserves for asbestos and environmental claims	85,000,000	84,000,000
Environmental claims related to mold	$ 45,000,000	$ 45,000,000
Percentage of reserves for asbestos and environmental claims	1.80%	1.90%
Maximum
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Reinsurance retention	$ 500,000
Life and Health Loss Reserves
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	50,000,000	$ 58,000,000	47,000,000
Commercial Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(129,000,000)	(154,000,000)	(57,000,000)
Commercial Insurance | Workers' Compensation Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	1,001,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(69,000,000)	(93,000,000)	(51,000,000)
Commercial Insurance | Commercial Property Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	306,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(29,000,000)		(34,000,000)
Commercial Insurance | Other Commercial Lines
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(42,000,000)
Commercial Insurance | Homeowner Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense, (favorable) and unfavorable			(14,000,000)
Commercial Insurance | Commercial Casualty Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	1,957,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(20,000,000)	(63,000,000)	5,000,000
Commercial Insurance | Commercial Auto Line
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	521,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	31,000,000	31,000,000	39,000,000
Personal Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(4,000,000)	5,000,000	(12,000,000)
Personal Insurance | Personal Auto
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	280,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	18,000,000
Excess and Surplus Lines Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Certain accident, life and health loss reserves	229,000,000
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(34,000,000)	(35,000,000)	(29,000,000)
Reinsurance assumed and other non segment [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Prior year claims and claims adjustment expense, (favorable) and unfavorable	$ (1,000,000)	$ 0	$ 0

Property Casualty Loss And Lo63

Property Casualty Loss And Loss Expenses (Consolidated Property Casualty Loss And Loss Expense Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Insurance [Abstract]
Gross loss and loss expense reserves, January 1	$ 4,660	$ 4,438	$ 4,241
Less reinsurance recoverable	281	282	299
Net loss and loss expense reserves, January 1	4,379	4,156	3,942
Net incurred loss and loss expenses related to:
Current accident year	3,029	2,756	2,725
Prior accident years	(168)	(184)	(98)
Total incurred	2,861	2,572	2,627
Net paid loss and loss expenses related to:
Current accident year	1,260	1,152	1,212
Prior accident years	1,243	1,197	1,201
Total paid	2,503	2,349	2,413
Net loss and loss expense reserves, December 31	4,737	4,379	4,156
Plus reinsurance recoverable	298	281	282
Gross loss and loss expense reserves, December 31	$ 5,035	$ 4,660	$ 4,438

Property Casualty Loss And Lo64

Property Casualty Loss And Loss Expenses (Reconciliation of Incurred Losses and ALAE) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	$ 2,187
Total liabilities for loss and ALAE, net of reinsurance	4,770
Reinsurance recoverable on unpaid losses	298	$ 281	$ 282	$ 299
Unallocated loss adjustment expense reserves	265
Total liabilities for gross loss and loss expense reserves	5,035	$ 4,660	$ 4,438	$ 4,241
Other Short-duration Insurance Product Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Total liabilities for loss and ALAE, net of reinsurance	342
Commercial Insurance | Commercial Casualty Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	4,160
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	2,421
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	81
Total liabilities for loss and ALAE, net of reinsurance	1,820
Reinsurance recoverable on unpaid losses	137
Total liabilities for gross loss and loss expense reserves	1,957
Commercial Insurance | Workers' Compensation Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	2,370
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	1,686
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	242
Total liabilities for loss and ALAE, net of reinsurance	926
Reinsurance recoverable on unpaid losses	75
Total liabilities for gross loss and loss expense reserves	1,001
Commercial Insurance | Commercial Auto Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	1,768
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	1,264
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	12
Total liabilities for loss and ALAE, net of reinsurance	516
Reinsurance recoverable on unpaid losses	5
Total liabilities for gross loss and loss expense reserves	521
Commercial Insurance | Commercial Property Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	2,187
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	1,910
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	11
Total liabilities for loss and ALAE, net of reinsurance	288
Reinsurance recoverable on unpaid losses	18
Total liabilities for gross loss and loss expense reserves	306
Personal Insurance | Personal Auto
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	1,633
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	1,388
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	4
Total liabilities for loss and ALAE, net of reinsurance	249
Reinsurance recoverable on unpaid losses	31
Total liabilities for gross loss and loss expense reserves	280
Personal Insurance | Home Owner Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	1,452
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	1,322
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	2
Total liabilities for loss and ALAE, net of reinsurance	132
Reinsurance recoverable on unpaid losses	2
Total liabilities for gross loss and loss expense reserves	134
Excess and Surplus Lines Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Cumulative incurred losses and ALAE as reported within the triangles, net of reinsurance	366
Cumulative paid losses and ALAE as reported within the triangles, net of reinsurance	144
Liabilities for loss and ALAE for accident years not presented in the triangles, net of reinsurance	1
Total liabilities for loss and ALAE, net of reinsurance	223
Reinsurance recoverable on unpaid losses	6
Total liabilities for gross loss and loss expense reserves	$ 229

Property Casualty Loss And Lo65

Property Casualty Loss And Loss Expenses (Claims Development - Commercial Casualty) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)	Dec. 31, 2010USD ($)	Dec. 31, 2009USD ($)	Dec. 31, 2008USD ($)	Dec. 31, 2007USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	4,160
Cumulative paid losses and ALAE, net of reinsurance	2,421
All outstanding liabilities before, net of reinsurance	81
Liabilities for loss and ALAE, net of reinsurance	1,820
2007 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	341	$ 333	$ 338	$ 328	$ 334	$ 352	$ 379	$ 412	$ 447	$ 509
Total of incurred but not reported liabilities plus expected development on reported losses	$ 5
Cumulative number of reported claims | reported_claim	0
Cumulative paid losses and ALAE, net of reinsurance	$ 324	314	309	290	275	248	200	145	92	$ 29
2008 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	355	357	357	359	362	387	409	458	516
Total of incurred but not reported liabilities plus expected development on reported losses	$ 10
Cumulative number of reported claims | reported_claim	0
Cumulative paid losses and ALAE, net of reinsurance	$ 331	325	315	293	262	212	158	93	$ 31
2009 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	357	357	365	370	360	412	409	484
Total of incurred but not reported liabilities plus expected development on reported losses	$ 21
Cumulative number of reported claims | reported_claim	20
Cumulative paid losses and ALAE, net of reinsurance	$ 322	310	295	267	213	151	75	$ 27
2010 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	349	348	347	349	378	394	495
Total of incurred but not reported liabilities plus expected development on reported losses	$ 31
Cumulative number of reported claims | reported_claim	20
Cumulative paid losses and ALAE, net of reinsurance	$ 300	285	256	203	159	92	$ 33
2011 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	380	375	377	377	404	466
Total of incurred but not reported liabilities plus expected development on reported losses	$ 37
Cumulative number of reported claims | reported_claim	19
Cumulative paid losses and ALAE, net of reinsurance	$ 298	266	227	149	93	$ 27
2012 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	394	394	417	414	466
Total of incurred but not reported liabilities plus expected development on reported losses	$ 48
Cumulative number of reported claims | reported_claim	18
Cumulative paid losses and ALAE, net of reinsurance	$ 288	232	170	88	$ 27
2013 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	416	431	443	448
Total of incurred but not reported liabilities plus expected development on reported losses	$ 96
Cumulative number of reported claims | reported_claim	19
Cumulative paid losses and ALAE, net of reinsurance	$ 232	159	90	$ 35
2014 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	479	496	503
Total of incurred but not reported liabilities plus expected development on reported losses	$ 128
Cumulative number of reported claims | reported_claim	20
Cumulative paid losses and ALAE, net of reinsurance	$ 172	97	$ 34
2015 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	526	533
Total of incurred but not reported liabilities plus expected development on reported losses	$ 225
Cumulative number of reported claims | reported_claim	19
Cumulative paid losses and ALAE, net of reinsurance	$ 108	$ 38
2016 | Commercial Casualty Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	563
Total of incurred but not reported liabilities plus expected development on reported losses	$ 337
Cumulative number of reported claims | reported_claim	15
Cumulative paid losses and ALAE, net of reinsurance	$ 46

Property Casualty Loss And Lo66

Property Casualty Loss And Loss Expenses (Claims Development - Workers Compensation) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)	Dec. 31, 2010USD ($)	Dec. 31, 2009USD ($)	Dec. 31, 2008USD ($)	Dec. 31, 2007USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	2,370
Cumulative paid losses and ALAE, net of reinsurance	1,686
All outstanding liabilities before, net of reinsurance	242
Liabilities for loss and ALAE, net of reinsurance	926
2007 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	275	$ 277	$ 277	$ 280	$ 279	$ 277	$ 286	$ 287	$ 281	$ 286
Total of incurred but not reported liabilities plus expected development on reported losses	$ 28
Cumulative number of reported claims | reported_claim	0
Cumulative paid losses and ALAE, net of reinsurance	$ 238	237	233	230	226	219	206	185	145	$ 67
2008 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	296	296	297	299	299	302	310	305	298
Total of incurred but not reported liabilities plus expected development on reported losses	$ 31
Cumulative number of reported claims | reported_claim	0
Cumulative paid losses and ALAE, net of reinsurance	$ 254	251	247	242	233	217	195	155	$ 72
2009 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	234	234	235	238	238	263	278	307
Total of incurred but not reported liabilities plus expected development on reported losses	$ 22
Cumulative number of reported claims | reported_claim	27
Cumulative paid losses and ALAE, net of reinsurance	$ 201	198	193	188	179	163	132	$ 65
2010 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	240	239	240	242	248	274	283
Total of incurred but not reported liabilities plus expected development on reported losses	$ 26
Cumulative number of reported claims | reported_claim	26
Cumulative paid losses and ALAE, net of reinsurance	$ 202	198	192	181	164	134	$ 67
2011 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	236	239	242	246	251	284
Total of incurred but not reported liabilities plus expected development on reported losses	$ 26
Cumulative number of reported claims | reported_claim	24
Cumulative paid losses and ALAE, net of reinsurance	$ 190	186	177	161	131	$ 65
2012 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	213	220	234	245	265
Total of incurred but not reported liabilities plus expected development on reported losses	$ 29
Cumulative number of reported claims | reported_claim	21
Cumulative paid losses and ALAE, net of reinsurance	$ 171	162	147	121	$ 62
2013 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	212	221	246	264
Total of incurred but not reported liabilities plus expected development on reported losses	$ 34
Cumulative number of reported claims | reported_claim	20
Cumulative paid losses and ALAE, net of reinsurance	$ 157	144	119	$ 61
2014 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	214	233	261
Total of incurred but not reported liabilities plus expected development on reported losses	$ 48
Cumulative number of reported claims | reported_claim	19
Cumulative paid losses and ALAE, net of reinsurance	$ 134	110	$ 56
2015 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	220	246
Total of incurred but not reported liabilities plus expected development on reported losses	$ 83
Cumulative number of reported claims | reported_claim	17
Cumulative paid losses and ALAE, net of reinsurance	$ 93	$ 47
2016 | Workers' Compensation Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	230
Total of incurred but not reported liabilities plus expected development on reported losses	$ 106
Cumulative number of reported claims | reported_claim	14
Cumulative paid losses and ALAE, net of reinsurance	$ 46

Property Casualty Loss And Lo67

Property Casualty Loss And Loss Expenses (Claims Development - Commercial Auto) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	1,768
Cumulative paid losses and ALAE, net of reinsurance	1,264
All outstanding liabilities before, net of reinsurance	12
Liabilities for loss and ALAE, net of reinsurance	516
2012 | Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	294	$ 288	$ 285	$ 273	$ 275
Total of incurred but not reported liabilities plus expected development on reported losses	$ 2
Cumulative number of reported claims | reported_claim	43
Cumulative paid losses and ALAE, net of reinsurance	$ 278	258	222	184	$ 129
2013 | Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	322	315	305	292
Total of incurred but not reported liabilities plus expected development on reported losses	$ 9
Cumulative number of reported claims | reported_claim	46
Cumulative paid losses and ALAE, net of reinsurance	$ 285	246	199	$ 141
2014 | Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	351	346	333
Total of incurred but not reported liabilities plus expected development on reported losses	$ 14
Cumulative number of reported claims | reported_claim	51
Cumulative paid losses and ALAE, net of reinsurance	$ 273	223	$ 159
2015 | Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	384	374
Total of incurred but not reported liabilities plus expected development on reported losses	$ 38
Cumulative number of reported claims | reported_claim	51
Cumulative paid losses and ALAE, net of reinsurance	$ 244	$ 173
2016 | Commercial Auto Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	417
Total of incurred but not reported liabilities plus expected development on reported losses	$ 81
Cumulative number of reported claims | reported_claim	49
Cumulative paid losses and ALAE, net of reinsurance	$ 184

Property Casualty Loss And Lo68

Property Casualty Loss And Loss Expenses (Claims Development - Commercial Property) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	2,187
Cumulative paid losses and ALAE, net of reinsurance	1,910
All outstanding liabilities before, net of reinsurance	11
Liabilities for loss and ALAE, net of reinsurance	288
2012 | Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	386	$ 383	$ 388	$ 389	$ 403
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	16
Cumulative paid losses and ALAE, net of reinsurance	$ 383	380	376	356	$ 255
2013 | Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	356	352	359	389
Total of incurred but not reported liabilities plus expected development on reported losses	$ 2
Cumulative number of reported claims | reported_claim	14
Cumulative paid losses and ALAE, net of reinsurance	$ 349	344	330	$ 227
2014 | Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	441	444	452
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	17
Cumulative paid losses and ALAE, net of reinsurance	$ 432	412	$ 297
2015 | Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	414	454
Total of incurred but not reported liabilities plus expected development on reported losses	$ 5
Cumulative number of reported claims | reported_claim	16
Cumulative paid losses and ALAE, net of reinsurance	$ 388	$ 279
2016 | Commercial Property Line | Commercial Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	590
Total of incurred but not reported liabilities plus expected development on reported losses	$ 38
Cumulative number of reported claims | reported_claim	16
Cumulative paid losses and ALAE, net of reinsurance	$ 358

Property Casualty Loss And Lo69

Property Casualty Loss And Loss Expenses (Claims Development - Personal Auto) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	1,633
Cumulative paid losses and ALAE, net of reinsurance	1,388
All outstanding liabilities before, net of reinsurance	4
Liabilities for loss and ALAE, net of reinsurance	249
2012 | Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	271	$ 270	$ 269	$ 265	$ 260
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	89
Cumulative paid losses and ALAE, net of reinsurance	$ 268	262	250	223	$ 174
2013 | Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	298	293	280	280
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	96
Cumulative paid losses and ALAE, net of reinsurance	$ 287	272	245	$ 190
2014 | Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	325	317	317
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	104
Cumulative paid losses and ALAE, net of reinsurance	$ 298	267	$ 210
2015 | Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	356	343
Total of incurred but not reported liabilities plus expected development on reported losses	$ 12
Cumulative number of reported claims | reported_claim	108
Cumulative paid losses and ALAE, net of reinsurance	$ 292	$ 229
2016 | Personal Auto | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	383
Total of incurred but not reported liabilities plus expected development on reported losses	$ 38
Cumulative number of reported claims | reported_claim	104
Cumulative paid losses and ALAE, net of reinsurance	$ 243

Property Casualty Loss And Lo70

Property Casualty Loss And Loss Expenses (Claims Development - Homeowner) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	1,452
Cumulative paid losses and ALAE, net of reinsurance	1,322
All outstanding liabilities before, net of reinsurance	2
Liabilities for loss and ALAE, net of reinsurance	132
2012 | Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	329	$ 330	$ 328	$ 330	$ 344
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	33
Cumulative paid losses and ALAE, net of reinsurance	$ 329	328	324	317	$ 256
2013 | Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	247	247	246	252
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	25
Cumulative paid losses and ALAE, net of reinsurance	$ 244	242	236	$ 180
2014 | Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	286	283	297
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	26
Cumulative paid losses and ALAE, net of reinsurance	$ 281	273	$ 224
2015 | Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	275	284
Total of incurred but not reported liabilities plus expected development on reported losses	$ 3
Cumulative number of reported claims | reported_claim	23
Cumulative paid losses and ALAE, net of reinsurance	$ 260	$ 203
2016 | Home Owner Line | Personal Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	315
Total of incurred but not reported liabilities plus expected development on reported losses	$ 29
Cumulative number of reported claims | reported_claim	21
Cumulative paid losses and ALAE, net of reinsurance	$ 208

Property Casualty Loss And Lo71

Property Casualty Loss And Loss Expenses (Claims Development - Excess and Surplus Lines) (Details) reported_claim in Thousands, $ in Millions	Dec. 31, 2016USD ($)reported_claim	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	$ 2,187
Liabilities for loss and ALAE, net of reinsurance	4,770
Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	366
Cumulative paid losses and ALAE, net of reinsurance	144
All outstanding liabilities before, net of reinsurance	1
Liabilities for loss and ALAE, net of reinsurance	223
2011 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	35	$ 36	$ 38	$ 44	$ 47	$ 48
Total of incurred but not reported liabilities plus expected development on reported losses	$ 0
Cumulative number of reported claims | reported_claim	1
Cumulative paid losses and ALAE, net of reinsurance	$ 32	30	27	23	14	$ 8
2012 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	37	40	49	56	67
Total of incurred but not reported liabilities plus expected development on reported losses	$ 2
Cumulative number of reported claims | reported_claim	1
Cumulative paid losses and ALAE, net of reinsurance	$ 29	25	19	15	$ 9
2013 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	45	54	64	74
Total of incurred but not reported liabilities plus expected development on reported losses	$ 9
Cumulative number of reported claims | reported_claim	2
Cumulative paid losses and ALAE, net of reinsurance	$ 27	20	12	$ 7
2014 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	75	82	95
Total of incurred but not reported liabilities plus expected development on reported losses	$ 26
Cumulative number of reported claims | reported_claim	2
Cumulative paid losses and ALAE, net of reinsurance	$ 27	17	$ 9
2015 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	81	96
Total of incurred but not reported liabilities plus expected development on reported losses	$ 40
Cumulative number of reported claims | reported_claim	2
Cumulative paid losses and ALAE, net of reinsurance	$ 19	$ 8
2016 | Excess and Surplus Lines Insurance
Claims Development [Line Items]
Incurred losses and ALAE, net of reinsurance	93
Total of incurred but not reported liabilities plus expected development on reported losses	$ 54
Cumulative number of reported claims | reported_claim	2
Cumulative paid losses and ALAE, net of reinsurance	$ 10

Property Casualty Loss And Lo72

Property Casualty Loss And Loss Expenses (Average Annual Payout) (Details)	Dec. 31, 2016
Commercial Insurance | Commercial Auto Line
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	44.40%
2	18.40%
3	13.90%
4	12.20%
5	6.90%
Commercial Insurance | Workers' Compensation Line
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	25.70%
2	26.90%
3	12.70%
4	7.10%
5	4.40%
6	2.40%
7	1.60%
8	1.40%
9	1.20%
10	0.50%
Commercial Insurance | Commercial Casualty Line
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	8.00%
2	15.40%
3	17.70%
4	16.50%
5	13.80%
6	8.30%
7	4.70%
8	4.00%
9	1.50%
10	2.90%
Commercial Insurance | Commercial Auto Line
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	65.00%
2	26.80%
3	4.60%
4	1.20%
5	0.90%
Personal Insurance | Home Owner Line
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	73.80%
2	19.70%
3	2.60%
4	1.00%
5	0.30%
Personal Insurance | Personal Auto
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	64.00%
2	17.90%
3	9.60%
4	4.80%
5	2.00%
Excess and Surplus Lines Insurance
Short-duration Insurance Contracts, Historical Claims Duration [Line Items]
1	15.90%
2	13.50%
3	17.40%
4	13.50%
5	9.90%
6	7.40%

Life Policy And Investment Co73

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 ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 2,671	$ 2,583
Life Policy Reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,056	987
Life Policy Reserves | Ordinary/Traditional Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,011	943
Life Policy Reserves | Other Life Policy Reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	45	44
Investment contract reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	1,615	1,596
Investment contract reserves | Deferred Annuities
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	861	860
Investment contract reserves | Universal Life
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	578	558
Investment contract reserves | Structured Settlements
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	170	174
Investment contract reserves | Other Investment Contract Reserves
Liability for Future Policy Benefit, by Product Segment
Life policy and investment contract reserves	$ 6	$ 4

Deferred Policy Acquisition C74

Deferred Policy Acquisition Costs (Deferred Policy Acquisition Costs And Asset Reconciliation Including The Amortized Deferred Policy Acquisition Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	$ 616	$ 578	$ 565
Capitalized deferred policy acquisition costs	889	846	827
Amortized deferred policy acquisition costs	(863)	(829)	(807)
Amortized shadow deferred policy acquisition costs	(5)	21	(7)
Deferred policy acquisition costs asset at December 31	637	616	578
Property Casualty Insurance Segment [Member]
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	388	379	366
Capitalized deferred policy acquisition costs	840	801	783
Amortized deferred policy acquisition costs	(820)	(792)	(770)
Deferred policy acquisition costs asset at December 31	408	388	379
Life Insurance Product Line [Member]
Deferred Costs [Roll Forward]
Deferred policy acquisition costs asset at January 1	228	199	199
Capitalized deferred policy acquisition costs	49	45	44
Amortized deferred policy acquisition costs	(43)	(37)	(37)
Amortized shadow deferred policy acquisition costs	(5)	21	(7)
Deferred policy acquisition costs asset at December 31	$ 229	$ 228	$ 199

Note Payable (Narrative) (Detai

Note Payable (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Debt Disclosure
Number of lines of credit	1	1
Aggregate borrowing capacity	$ 225	$ 225
Accordian feature available amount	$ 50	50
Line of credit facility, term	5 years
Expiration date of Line of credit	May 13, 2019
Note payable	$ 20	$ 35
Minimum
Debt Disclosure
Line of credit, interest rate	1.31%	1.07%
Maximum
Debt Disclosure
Line of credit, interest rate	1.49%	1.19%

Long-Term Debt And Capital Le76

Long-Term Debt And Capital Lease Obligation (Book Value And Principal Amounts Of Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument
Book value	$ 787	$ 786
Principal amount	$ 793	$ 793
6.900% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.90%	6.90%
Debt issuance year	1,998
Book value	$ 26	$ 26
Principal amount	$ 28	$ 28
6.920% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.92%	6.92%
Debt issuance year	2,005
Book value	$ 391	$ 391
Principal amount	$ 391	$ 391
6.125% Senior Notes, Due 2034
Debt Instrument
Interest rate	6.125%	6.125%
Debt issuance year	2,004
Book value	$ 370	$ 369
Principal amount	$ 374	$ 374

Long-Term Debt And Capital Le77

Long-Term Debt And Capital Lease Obligation (Capital Lease Payments Over Next Five Years) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt and Capital Lease Obligations [Abstract]
2,016	$ 12
2,017	10
2,018	7
2,019	5
2,020	3
2,021	2
Capital lease obligations	$ 39	$ 35

Shareholders' Equity And Divi78

Shareholders' Equity And Dividend Restrictions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shareholders Equity And Dividend Restrictions [Abstract]
Declared cash dividends, per share	$ 1.92	$ 2.3	$ 1.76
Dividends declared by insurance subsidiary to parent	$ 475	$ 447	$ 400
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 next year	$ 469

Shareholders' Equity And Divi79

Shareholders' Equity And Dividend Restrictions (Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income, Before Tax
Pension obligations OCI	$ 16	$ (6)	$ (18)
Accumulated Other Comprehensive Income, Income Tax
Income taxes on above of other comprehensive income (loss)	188	(218)	130
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,344
Other comprehensive income (loss) before tax	537	(618)	370
AOCI, balance at the end of the period	1,693	1,344
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	2,094	2,719	2,335
OCI before realized gains (losses) recognized in net income	653	(556)	514
Realized gains (losses) recognized in net income	(122)	(69)	(130)
OCI, portion attributable to Parent	531	(625)	384
AOCI, balance at the end of the period	2,625	2,094	2,719
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	722	942	808
OCI before realized gains (losses) recognized in net income	229	(196)	181
Realized gains (losses) recognized in net income	(43)	(24)	(47)
Income taxes on above of other comprehensive income (loss)	186	(220)	134
AOCI, balance at the end of the period	908	722	942
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,372	1,777	1,527
OCI before realized gains (losses) recognized in net income	424	(360)	333
Realized gains (losses) recognized in net income	(79)	(45)	(83)
Other comprehensive income (loss) before tax	345	(405)	250
AOCI, balance at the end of the period	1,717	1,372	1,777
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(42)	(36)	(18)
OCI before realized gains (losses) recognized in net income	13	(12)	(21)
Realized gains (losses) recognized in net income	3	6	3
OCI, portion attributable to Parent	16	(6)	(18)
AOCI, balance at the end of the period	(26)	(42)	(36)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(14)	(12)	(6)
OCI before realized gains (losses) recognized in net income	5	(5)	(7)
Realized gains (losses) recognized in net income	1	3	1
Income taxes on above of other comprehensive income (loss)	6	(2)	(6)
AOCI, balance at the end of the period	(8)	(14)	(12)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(28)	(24)	(12)
OCI before realized gains (losses) recognized in net income	8	(7)	(14)
Realized gains (losses) recognized in net income	2	3	2
Other comprehensive income (loss) before tax	10	(4)	(12)
AOCI, balance at the end of the period	(18)	(28)	(24)
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	1	(12)	(16)
OCI before realized gains (losses) recognized in net income	(8)	14	7
Realized gains (losses) recognized in net income	(2)	(1)	(3)
OCI, portion attributable to Parent	(10)	13	4
AOCI, balance at the end of the period	(9)	1	(12)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	1	(3)	(5)
OCI before realized gains (losses) recognized in net income	(3)	5	3
Realized gains (losses) recognized in net income	(1)	(1)	(1)
Income taxes on above of other comprehensive income (loss)	(4)	4	2
AOCI, balance at the end of the period	(3)	1	(3)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	0	(9)	(11)
OCI before realized gains (losses) recognized in net income	(5)	9	4
Realized gains (losses) recognized in net income	(1)	0	(2)
Other comprehensive income (loss) before tax	(6)	9	2
AOCI, balance at the end of the period	(6)	0	(9)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	2,053	2,671	2,301
Investments OCI	531	(625)	384
Pension obligations OCI	16	(6)	(18)
Life deferred acquisition costs, life policy reserves and other OCI	(10)	13	4
Total OCI	537	(618)	370
AOCI, balance at the end of the period	2,590	2,053	2,671
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	709	927	797
Investments OCI	186	(220)	134
Pension obligations OCI	6	(2)	(6)
Life deferred acquisition costs, life policy reserves and other OCI	(4)	4	2
Total OCI	188	(218)	130
AOCI, balance at the end of the period	897	709	927
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1,344	1,744	1,504
Investments OCI	345	(405)	250
Pension obligations OCI	10	(4)	(12)
Life deferred acquisition costs, life policy reserves and other OCI	(6)	9	2
Total OCI	349	(400)	240
AOCI, balance at the end of the period	$ 1,693	$ 1,344	$ 1,744

Reinsurance Reinsurance (Writte

Reinsurance Reinsurance (Written Consolidated Property Casualty Insurance Premiums On Assumed and Ceded Business) (Details) - Property, Liability and Casualty Insurance Product Line [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct Premiums Written	$ 4,646	$ 4,461	$ 4,309
Assumed Premiums Written	103	77	11
Ceded Premiums Written	(169)	(177)	(177)
Premiums Written, Net, Property and Casualty	$ 4,580	$ 4,361	$ 4,143

Reinsurance (Earned Consolidate

Reinsurance (Earned Consolidated Property Casualty Insurance Premiums On Assumed And Ceded Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	$ 4,857	$ 4,667	$ 4,468
Assumed earned premiums	77	29	12
Ceded earned premiums	(224)	(216)	(237)
Property, Liability and Casualty Insurance Product Line [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Direct earned premiums	4,567	4,396	4,209
Assumed earned premiums	77	29	12
Ceded earned premiums	(162)	(154)	(176)
Net earned premiums	$ 4,482	$ 4,271	$ 4,045

Reinsurance (Incurred Consolida

Reinsurance (Incurred Consolidated Property Casualty Insurance Loss And Loss Expenses On Assumed And Ceded Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net incurred loss and loss expenses	$ 3,107	$ 2,808	$ 2,856
Property, Liability and Casualty Insurance Product Line [Member]
Direct incurred loss and loss expenses	2,874	2,596	2,661
Assumed incurred loss and loss expenses	43	12	6
Ceded incurred loss and loss expenses	(56)	(36)	(40)
Net incurred loss and loss expenses	$ 2,861	$ 2,572	$ 2,627

Reinsurance (Earned Life Insura

Reinsurance (Earned Life Insurance Premiums On Ceded Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Direct earned premiums	$ 4,857	$ 4,667	$ 4,468
Ceded earned premiums	(224)	(216)	(237)
Life Insurance Segment
Direct earned premiums	290	271	259
Ceded earned premiums	(62)	(62)	(61)
Net earned premiums	$ 228	$ 209	$ 198

Reinsurance (Life Insurance Con

Reinsurance (Life Insurance Contract Holders' Benefits Incurred On Ceded Business) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net incurred loss and loss expenses	$ 3,107	$ 2,808	$ 2,856
Life Insurance Segment
Direct contract holders' benefits incurred	303	292	299
Ceded contract holders' benefits incurred	(57)	(56)	(70)
Net incurred loss and loss expenses	$ 246	$ 236	$ 229

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax at statutory rate, percentage	35.00%	35.00%	35.00%
Income taxes paid, net	$ 2	$ 0	$ 0

Income Taxes (Components Of Def

Income Taxes (Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Loss and loss expense reserves	$ 199	$ 191
Unearned premiums	158	151
Investments	5	25
Other	52	42
Total gross deferred tax assets	414	409
Deferred tax liabilities:
Unrealized investment gains, net	907	719
Deferred acquisition costs	195	187
Life policy reserves	162	137
Other	15	4
Total gross deferred tax liabilities	1,279	1,047
Net deferred income tax liability	$ 865	$ 638

Income Taxes (Differences Betwe

Income Taxes (Differences Between The 35 Percent Statutory Income Tax Rate And Effective Income Tax Rate) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax at statutory rate:	$ 284	$ 308	$ 252
Tax at statutory rate (percentage):	35.00%	35.00%	35.00%
Increase (decrease) resulting from:
Tax-exempt income from municipal bonds	$ (34)	$ (33)	$ (33)
Dividend received exclusion	(33)	(32)	(29)
Other	4	4	6
Total provision for income taxes	$ 221	$ 247	$ 196
Tax at statutory rate:
Tax-exempt income from municipal bonds (percentage)	(4.20%)	(3.70%)	(4.60%)
Dividend received exclusion (percentage)	(4.10%)	(3.60%)	(4.00%)
Other (percentage)	0.50%	0.30%	0.80%
Effective tax, percentage	27.20%	28.00%	27.20%

Net Income Per Common Share (Ca

Net Income Per Common Share (Calculations For Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income—basic and diluted	$ 100	$ 180	$ 123	$ 188	$ 156	$ 174	$ 176	$ 128	$ 591	$ 634	$ 525
Denominator:
Basic weighted-average common shares outstanding									164.5	164	163.5
Diluted weighted-average shares									166.5	165.6	165.1
Earnings per share:
Basic (in usd per share)	$ 0.61	$ 1.09	$ 0.75	$ 1.14	$ 0.95	$ 1.06	$ 1.07	$ 0.78	$ 3.59	$ 3.87	$ 3.21
Diluted (in usd per share)	$ 0.60	$ 1.08	$ 0.74	$ 1.13	$ 0.94	$ 1.05	$ 1.06	$ 0.77	$ 3.55	$ 3.83	$ 3.18
Number of anti-dilutive share-based awards									0.3	0.4	0.7
Stock Options
Denominator:
Effect of stock-based awards									1.1	1	1
Restricted Stock Units (RSUs)
Denominator:
Effect of stock-based awards									0.9	0.6	0.6

Employee Retirement Benefits (N

Employee Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2008
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Minimum participant age to elect						40 years
Employer discretionary contribution amount			$ 14	$ 12	$ 11
Requisite service period			3 years
Actual return on plan assets			16.60%	0.60%
Total recognized in net periodic benefit cost and other comprehensive income			$ (7)	$ 21	31
Amortization of actuarial loss			2
Amortization of prior service cost			1
Pension plan assets at fair value			$ 315	278	$ 288
Domestic Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			83.00%
Domestic Equity Securities | Information Technology Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			22.00%
Domestic Equity Securities | Financial Services Sector [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			20.00%
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 | Consumer Staple Sector [Member] [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			10.00%
Domestic Equity Securities | Consumer Discretionary Sector [Member] [Domain]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			10.00%
Domestic Equity Securities | Industrial Sector
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Allocation percentage of investments			10.00%
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			10.00%
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	$ 21
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			232,113	267,113
Pension plan assets, fair value			$ 18	$ 16
Shares sold during period			35,000	200,000
Cash dividends paid		$ 1	$ 1	$ 1
Pension Plan | Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate			0.25%
Pension Plan | Net Periodic Benefit Costs
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate			0.30%
Supplemental Employee Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Accrued employee benefit			$ 15	14
Expected contribution by employer during 2016			$ 12
Supplemental Employee Retirement Plan | Benefit Obligations
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Percentage of increase decrease in discount rate			0.20%
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			0.25%
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			$ 24	$ 21
Subsequent Event | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Expected contribution by employer during 2016	$ 5

Employee Retirement Benefits (W

Employee Retirement Benefits (Weighted-Average Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Benefit Obligations | Pension Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	4.30%	4.55%
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	4.10%	4.30%
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	4.55%	4.25%	5.15%
Expected return on plan assets	7.25%	7.25%	7.25%
Net Periodic Benefit Cost | Pension Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%	2.75%
Net Periodic Benefit Cost | Pension Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%	3.25%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan
Schedule of Benefit Obligations Weighted Average Assumptions
Discount rate	4.30%	4.05%	4.80%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan | Minimum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	2.75%	2.75%	2.75%
Net Periodic Benefit Cost | Supplemental Employee Retirement Plan | Maximum
Schedule of Benefit Obligations Weighted Average Assumptions
Rate of compensation increase	3.25%	3.25%	3.25%

Employee Retirement Benefits (B

Employee Retirement Benefits (Benefit Obligation Activity Using An Actuarial Measurement Date For Qualified Plan And SERP) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in projected benefit obligation:
Benefit obligation, January 1	$ 323	$ 319
Service cost	11	12	$ 10
Interest cost	14	14	15
Actuarial loss (gain)	13	(3)
Benefits paid	(21)	(19)
Other	0	0	2
Projected benefit obligation, December 31	340	323	319
Change in plan assets:
Fair value of plan assets, January 1	278	288
Actual return on plan assets	45	3
Employer contribution	13	6
Benefits paid	(21)	(19)
Fair value of plan assets, December 31	315	278	$ 288
Unfunded status:
Funded status, December 31	(25)	(45)
Accumulated benefit obligation	$ 309	$ 293

Employee Retirement Benefits (R

Employee Retirement Benefits (Reconciliation Of The Funded Status For Qualified Plan And SERP) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Other liabilities	$ (25)	$ (45)
Total	(25)	(45)
Pension amounts recognized in accumulated other comprehensive income:
Net actuarial loss	26	41
Prior service cost	0	1
Total	$ 26	$ 42

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 ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 11	$ 12	$ 10
Interest cost	14	14	15
Expected return on plan assets	(19)	(18)	(17)
Amortization of actuarial loss and prior service cost	3	6	2
Other	0	1	3
Net periodic benefit cost	9	15	13
Current year actuarial (gain) loss	(13)	13	21
Amortization of actuarial loss	(2)	(6)	(5)
Other	0	0	2
Amortization of prior service cost	(1)	(1)	0
Total recognized in other comprehensive (income) loss	$ (16)	$ 6	$ 18

Employee Retirement Benefits (F

Employee Retirement Benefits (Fair Value Hierarchy Of Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	$ 10,085	$ 9,650
Available for sale securities, equity securities	5,334	4,706
Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	51	45
Fixed Maturities | States, Municipalities and Political Subdivisions
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	31	32
Fixed Maturities | Corporate Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	20	13
Equity Securities | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	253	212
Debt And Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	304	257
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 | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	253	212
Level 1 | Debt And Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	253	212
Level 2 | Fixed Maturities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	51	45
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	31	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	20	13
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 2 | Debt And Equity Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, debt securities	51	45
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 | Common Stock
Schedule of Pension and Other Postretirment Plan Assets by Fair Value
Available for sale securities, equity securities	0	0
Level 3 | Debt And Equity Securities
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) $ in Millions	Dec. 31, 2016USD ($)
Compensation and Retirement Disclosure [Abstract]
Expected future benefit payments, 2017	$ 34
Expected future benefit payments, 2018	23
Expected future benefit payments, 2019	24
Expected future benefit payments, 2020	26
Expected future benefit payments, 2021	28
Expected future benefit payments, 2022 - 2026	$ 148

Statutory Accounting Informat96

Statutory Accounting Information (Schedule Of Statutory Net Income And Statutory Surplus (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
The Cincinnati Insurance Company
Statutory Accounting Practices
SAP net income (loss)	$ 434	$ 534	$ 436
Capital and surplus	4,686	4,412
The Cincinnati Casualty Company
Statutory Accounting Practices
SAP net income (loss)	11	12	12
Capital and surplus	360	337
The Cincinnati Indemnity Company
Statutory Accounting Practices
SAP net income (loss)	4	3	3
Capital and surplus	93	88
The Cincinnati Specialty Underwriters Insurance Company
Statutory Accounting Practices
SAP net income (loss)	57	49	32
Capital and surplus	372	306
The Cincinnati Life Insurance Company
Statutory Accounting Practices
SAP net income (loss)	2	(11)	$ (19)
Capital and surplus	$ 200	$ 208

Transactions With Affliated Par

Transactions With Affliated Parties (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction
Payment for commissions	$ 7	$ 7	$ 7
Earned premiums	4,710	4,480	4,243
Affiliated Parties
Related Party Transaction
Earned premiums	$ 44	$ 42	$ 41

Share-Based Associate Compens98

Share-Based Associate Compensation Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)compensation_plansshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity compensation plans | compensation_plans	4
Share based compensation	$ 15	$ 14	$ 13
Tax benefit from compensation expense	8	6	6
Options exercised, intrinsic value	25	15	13
Options vested, intrinsic value	11	7	9
Unrecognized compensation costs related to non-vested awards	$ 26
Expected weighted-average period to recognize the unrecognized compensation costs related to non-vested awards	1 year 9 months 18 days
Maximum number of shares awarded to each full-time employee for their service | shares	10
Proceeds from stock options exercised	$ 21	24	22
Shares of common stock granted in period (in shares) | shares	359,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards exercise peirod	10 years
Awards vesting period	3 years
Proceeds from stock options exercised	$ 21	$ 24	$ 22
Shares repurchased | shares	186,097	292,414	378,276
Shares repurchased, value	$ 13	$ 16	$ 19
Weighted average remaining contractual term	8 years 5 months 10 days
Shares authorized to be granted under the shareholder-approved plans | shares	17,300,000
Shares available for future issuance under the plans | shares	13,000,000
Stock Options | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock granted in period (in shares) | shares	18,769

Share-Based Associate Compens99

Share-Based Associate Compensation Plans (Assumptions Used In Grants Issued) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Stock Options
Weighted-average fair value of options granted during the period	$ 13.21	$ 11.15	$ 10.16
Stock Options | Minimum
Weighted-average expected term	8 years	8 years	8 years
Expected volatility	24.88%	25.04%	25.20%
Dividend yield	2.58%	3.52%	3.76%
Risk-free rates	1.44%	1.94%	2.42%
Stock Options | Maximum
Weighted-average expected term	8 years	9 years	9 years
Expected volatility	25.75%	26.15%	26.22%
Dividend yield	3.12%	3.52%	3.76%
Risk-free rates	1.60%	2.01%	2.62%
Performance Based Shares
Dividend yield		3.52%	3.74%
Risk-free rates		0.99%	0.66%
Performance Based Shares | Minimum
Weighted-average expected term	2 years 5 months 9 days
Expected volatility	15.42%	13.78%	18.69%
Dividend yield	2.58%
Risk-free rates	0.77%
Performance Based Shares | Maximum
Weighted-average expected term	2 years 10 months 18 days	2 years 10 months 18 days	2 years 10 months 18 days
Expected volatility	33.64%	34.69%	41.21%
Dividend yield	3.12%
Risk-free rates	0.87%

Share-Based Associate Compen100

Share-Based Associate Compensation Plans (Stock Option Information) (Details) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)$ / sharesshares
Shares
Outstanding at beginning of year (in shares) | shares	3,872
Granted (in shares) | shares	359
Exercised (in shares) | shares	(863)
Forfeited or expired (in shares) | shares	(356)
Outstanding at end of year (in shares) | shares	3,012
Options exercisable at end of period (in shares) | shares	2,319
Weighted-average exercise price
Outstanding at beginning of year (in dollars per share) | $ / shares	$ 39.78
Granted (in dollars per share) | $ / shares	61.47
Exercised (in dollars per share) | $ / shares	38.64
Forfeited or expired (in dollars per share) | $ / shares	44.66
Outstanding at end of year (in dollars per share) | $ / shares	42.12
Options exercisable at end of period (in dollars per share) | $ / shares	$ 38.01
Aggregate intrinsic value
Outstanding at end of year | $	$ 101
Options exercisable at end of period | $	$ 88
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 14 days

Share-Based Associate Compen101

Share-Based Associate Compensation Plans (Restricted Stock Unit Information) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)peers_exceeded$ / sharesshares	Dec. 31, 2015USD ($)peers_exceeded$ / sharesshares	Dec. 31, 2014USD ($)peers_exceededPeers
Reconciliation of Restricted Stock Activity [Line Items]
Number of peers exceeded | peers_exceeded	5	4	6
Number of peers 2012 | Peers			10
Restricted Stock Units (RSUs) | Service Based Shares
Nonvested shares
Beginning balance (in shares)	902,000
Granted (in shares)	323,000
Vested (in shares)	(313,000)
Forfeited or canceled (in shares)	(24,000)
Ending balance (in shares)	888,000	902,000
Weighted-average grant-date fair value
Beginning balance (in dollars per share) | $ / shares	$ 43.15
Granted (in dollars per share) | $ / shares	56.39
Vested (in dollars per share) | $ / shares	40.99
Forfeited or canceled (in dollars per share) | $ / shares	48.31
Ending balance (in dollars per share) | $ / shares	$ 48.59	$ 43.15
Restricted Stock Units (RSUs) | Performance Based Shares
Nonvested shares
Beginning balance (in shares)	256,000
Granted (in shares)	68,000
Vested (in shares)	(25,000)
Forfeited or canceled (in shares)	(63,000)
Ending balance (in shares)	236,000	256,000
Weighted-average grant-date fair value
Beginning balance (in dollars per share) | $ / shares	$ 42.35
Granted (in dollars per share) | $ / shares	70.68
Vested (in dollars per share) | $ / shares	44.82
Forfeited or canceled (in dollars per share) | $ / shares	44.82
Ending balance (in dollars per share) | $ / shares	$ 49.64	$ 42.35
Restricted Stock Units (RSUs) | Service Based Shares
Reconciliation of Restricted Stock Activity [Line Items]
Awards vesting period	3 years
Awards other than options vested, intrinsic value | $	$ 23	$ 26	$ 14
Restricted Stock Units (RSUs) | Performance Based Shares
Reconciliation of Restricted Stock Activity [Line Items]
Awards vesting period	3 years
Awards other than options vested, intrinsic value | $	$ 6	$ 6	$ 3
share based performance metric for performance shares	3 years
Risk-free rates, minimum	0.00%	0.00%	0.00%
Risk-free rates, maximum	200.00%	200.00%	200.00%
Shares, Issued	25,461	103,586

Segment Information (Details)

Segment Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2016USD ($)segmentindustry	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information
Earned premiums									$ 4,710	$ 4,480	$ 4,243
Total revenues	$ 1,312	$ 1,402	$ 1,371	$ 1,364	$ 1,263	$ 1,278	$ 1,316	$ 1,285	5,449	5,142	4,945
Other Income									5	7	8
Fees and Commissions									15	13	12
Net Investment Income									595	572	549
Total									124	70	133
Income before income taxes	128	$ 253	$ 166	$ 265	216	$ 243	$ 248	$ 174	812	881	721
Identifiable assets	20,386				18,888				$ 20,386	18,888
Number of Industries Operated In | industry									2
Number of Insurance Segments | segment									4
Life Insurance Segment
Segment Reporting Information
Earned premiums									$ 228	209	198
Identifiable assets	1,366				1,325				1,366	1,325
Investments Segment
Segment Reporting Information
Identifiable assets	15,569				14,485				15,569	14,485
Consolidated Property and Casualty Insurance Entity
Segment Reporting Information
Identifiable assets	2,967				2,717				2,967	2,717
Corporate and Other [Member]
Segment Reporting Information
Identifiable assets	$ 484				$ 361				484	361
Operating Segments | Commercial Insurance
Segment Reporting Information
Earned premiums									3,089	2,996	2,856
Total revenues									3,094	3,000	2,860
Fees and Commissions									5	4	4
Income before income taxes									184	345	146
Operating Segments | Commercial Insurance | Commercial Casualty Line
Segment Reporting Information
Earned premiums									1,050	1,010	938
Operating Segments | Commercial Insurance | Commercial Property Line
Segment Reporting Information
Earned premiums									867	815	728
Operating Segments | Commercial Insurance | Commercial Auto Line
Segment Reporting Information
Earned premiums									594	561	528
Operating Segments | Commercial Insurance | Workers' Compensation Line
Segment Reporting Information
Earned premiums									354	367	370
Operating Segments | Commercial Insurance | Other Commercial Lines
Segment Reporting Information
Earned premiums									224	243	292
Operating Segments | Personal Insurance
Segment Reporting Information
Earned premiums									1,161	1,097	1,041
Total revenues									1,165	1,100	1,043
Fees and Commissions									4	3	2
Income before income taxes									(12)	(12)	10
Operating Segments | Personal Insurance | Personal Auto
Segment Reporting Information
Earned premiums									543	506	476
Operating Segments | Personal Insurance | Home Owner Line
Segment Reporting Information
Earned premiums									486	463	443
Operating Segments | Personal Insurance | Other Personal Lines
Segment Reporting Information
Earned premiums									132	128	122
Operating Segments | Excess and Surplus Lines Insurance
Segment Reporting Information
Earned premiums									183	168	148
Total revenues									184	169	148
Fees and Commissions									1	1	0
Income before income taxes									62	51	30
Operating Segments | Life Insurance Segment
Segment Reporting Information
Earned premiums									228	209	198
Total revenues									233	214	204
Fees and Commissions									5	5	6
Income before income taxes									1	(2)	(5)
Operating Segments | Investments Segment
Segment Reporting Information
Total revenues									719	642	682
Net Investment Income									595	572	549
Total									124	70	133
Income before income taxes									629	556	599
Corporate, Non-Segment [Member]
Segment Reporting Information
Total revenues									54	17	8
Corporate, Non-Segment [Member] | Reinsurance assumed and other non segment [Member]
Segment Reporting Information
Earned premiums									49	10	0
Corporate, Non-Segment [Member] | Corporate and Other [Member]
Segment Reporting Information
Other Income									5	7	8
Income before income taxes									$ (52)	$ (57)	$ (59)

Quarterly Supplementary Data (D

Quarterly Supplementary Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,312	$ 1,402	$ 1,371	$ 1,364	$ 1,263	$ 1,278	$ 1,316	$ 1,285	$ 5,449	$ 5,142	$ 4,945
Income before income taxes	128	253	166	265	216	243	248	174	812	881	721
Net Income (Loss) Attributable to Parent	$ 100	$ 180	$ 123	$ 188	$ 156	$ 174	$ 176	$ 128	$ 591	$ 634	$ 525
Basic (in usd per share)	$ 0.61	$ 1.09	$ 0.75	$ 1.14	$ 0.95	$ 1.06	$ 1.07	$ 0.78	$ 3.59	$ 3.87	$ 3.21
Diluted (in usd per share)	$ 0.60	$ 1.08	$ 0.74	$ 1.13	$ 0.94	$ 1.05	$ 1.06	$ 0.77	$ 3.55	$ 3.83	$ 3.18

Summary of Investments Other104

Summary of Investments Other Than Investments In Related Parties (Details)1 $ in Millions	Dec. 31, 2016USD ($)
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	$ 12,875
Fair value	0
Balance sheet	15,500
Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	9,799
Fair value	10,085
Balance sheet	10,085
Equity Securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	2,995
Fair value	5,334
Balance sheet	5,334
Other than Securities Investment
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	81
Fair value	0
Balance sheet	81
States, Municipalities and Political Subdivisions | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	3,770
Fair value	3,828
Balance sheet	3,828
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	2,900
Fair value	2,934
Balance sheet	2,934
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	149
Fair value	150
Balance sheet	150
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	40
Balance sheet	40
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	272
Fair value	287
Balance sheet	287
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	409
Fair value	416
Balance sheet	416
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	5
Fair value	5
Balance sheet	5
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	5
Fair value	5
Balance sheet	5
United States 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
United States Government | 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 | 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
Government-Sponsored Enterprises | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	167
Fair value	164
Balance sheet	164
Government-Sponsored Enterprises | Fixed Maturities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	167
Fair value	164
Balance sheet	164
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	2,812
Fair value	5,123
Balance sheet	5,123
Common Stock | Equity Securities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1,600
Fair value	3,053
Balance sheet	3,053
Common Stock | Equity Securities | The Cincinnati Casualty Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	50
Fair value	105
Balance sheet	105
Common Stock | Equity Securities | The Cincinnati Indemnity Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	13
Fair value	24
Balance sheet	24
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	91
Balance sheet	91
Common Stock | Equity Securities | CSU Producers Resources Inc.
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	15
Fair value	18
Balance sheet	18
Common Stock | Equity Securities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1,083
Fair value	1,832
Balance sheet	1,832
Nonredeemable Preferred Stock | Equity Securities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	183
Fair value	211
Balance sheet	211
Nonredeemable Preferred Stock | Equity Securities | The Cincinnati Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	177
Fair value	201
Balance sheet	201
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	9
Balance sheet	9
Nonredeemable Preferred Stock | Equity Securities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	1
Fair value	1
Balance sheet	1
All Other Corporate Bonds | Fixed Maturities
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	5,837
Fair value	6,068
Balance sheet	6,068
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	2,727
Fair value	2,836
Balance sheet	2,836
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	118
Fair value	123
Balance sheet	123
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	30
Fair value	31
Balance sheet	31
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	2,760
Fair value	2,865
Balance sheet	2,865
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	155
Fair value	160
Balance sheet	160
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	1
Fair value	1
Balance sheet	1
All Other Corporate Bonds | Fixed Maturities | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	46
Fair value	52
Balance sheet	52
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	23
Fair value	0
Balance sheet	23
Real Estate [Member] | Other than Securities Investment | The Cincinnati Life Insurance Company
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	21
Balance sheet	21
Real Estate [Member] | Other than Securities Investment | Cincinnati Financial Corporation
Summary Of Investments Other Than Investments In Related Parties Reportable Data
Cost or amortized cost	6
Balance sheet	$ 6

Condensed Financial Statemen105

Condensed Financial Statements Of Parent Company Condensed Statements Of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows From Operating Activities
Net Income	$ 100	$ 180	$ 123	$ 188	$ 156	$ 174	$ 176	$ 128	$ 591	$ 634	$ 525
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization									48	52	51
Realized investment gains, net									(124)	(70)	(133)
Changes in:
Investment income receivable									(5)	(6)	(2)
Current income tax receivable/payable									(35)	(18)	2
Other assets									34	(39)	19
Other liabilities									49	44	(11)
Net cash provided by operating activities									1,103	1,064	873
Cash Flows From Investing Activities
Sale of fixed maturities									15	43	26
Call or maturity of fixed maturities									1,511	1,199	1,019
Sale of equity securities									465	342	335
Purchase of fixed maturities									(1,994)	(1,722)	(1,312)
Purchase of equity securities									(439)	(493)	(392)
Investment in buildings and equipment, net									(13)	(10)	(9)
Change in other invested assets, net									(14)	1	9
Net cash used by investing activities									(456)	(624)	(311)
Cash Flows From Financing Activities
Payments of note payable									(15)	(14)	(55)
Payment of cash dividends to shareholders									(306)	(366)	(278)
Shares acquired - share repurchase authorization									(39)	(53)	(21)
Proceeds from stock options exercised									21	24	22
Other									(20)	(17)	(17)
Net cash used in financing activities									(414)	(487)	(404)
Net change in cash and cash equivalents									233	(47)	158
Cash and cash equivalents at beginning of year				544				591	544	591	433
Cash and cash equivalents at end of year	777				544				777	544	591
Cincinnati Financial Corporation
Cash Flows From Operating Activities
Net Income									591	634	525
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization									6	7	7
Realized investment gains, net									(27)	19	(34)
Dividends from subsidiaries									475	447	400
Changes in:
Increase in equity of subsidiaries									(566)	(642)	(504)
Investment income receivable									(2)	0	(1)
Current federal income taxes									(4)	(7)	3
Current income tax receivable/payable									8	(10)	(6)
Other assets									(4)	(3)	20
Other liabilities									(1)	13	(14)
Intercompany receivable for operations									20	16	22
Net cash provided by operating activities									496	474	418
Cash Flows From Investing Activities
Call or maturity of fixed maturities									5	8	4
Sale of equity securities									135	54	112
Purchase of equity securities									(175)	(110)	(225)
Investment in buildings and equipment, net									(2)	0	(2)
Change in other invested assets, net									6	1	4
Net cash used by investing activities									(31)	(47)	(107)
Cash Flows From Financing Activities
Payments of note payable									0	0	(55)
Payment of cash dividends to shareholders									(306)	(366)	(278)
Shares acquired - share repurchase authorization									(39)	(53)	(21)
Proceeds from stock options exercised									21	24	22
Other									1	2	2
Net cash used in financing activities									(323)	(393)	(330)
Net change in cash and cash equivalents									142	34	(19)
Cash and cash equivalents at beginning of year				$ 106				$ 72	106	72	91
Cash and cash equivalents at end of year	$ 248				$ 106				$ 248	$ 106	$ 72

Condensed Financial Statemen106

Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments
Fixed maturities, at fair value	$ 10,085	$ 9,650
Equity securities, at fair value	5,334	4,706
Other invested assets	81	67
Total investments	15,500	14,423
Cash and cash equivalents	777	544	$ 591	$ 433
Investment income receivable	134	129
Land, building and equipment, net, for company use (accumulated depreciation: 2016—$111; 2015—$118)	183	185
Other assets	198	154
Total assets	20,386	18,888
Liabilities
Deferred federal income tax	1,279	1,047
Long-term debt	787	786
Other liabilities	786	717
Total liabilities	13,326	12,461
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,252	1,232
Retained earnings	5,037	4,762
Accumulated other comprehensive income	1,693	1,344
Treasury stock at cost	(1,319)	(1,308)
Total shareholders' equity	7,060	6,427	6,573
Total liabilities and shareholders' equity	20,386	18,888
Cincinnati Financial Corporation
Investments
Fixed maturities, at fair value	52	58
Equity securities, at fair value	1,833	1,583
Other invested assets	29	36
Total investments	1,914	1,677
Cash and cash equivalents	248	106	$ 72	$ 91
Equity in net assets of subsidiaries	5,790	5,482
Investment income receivable	8	6
Land, building and equipment, net, for company use (accumulated depreciation: 2016—$111; 2015—$118)	132	139
Income tax receivable	10	6
Other assets	35	21
Due from subsidiaries	106	107
Total assets	8,243	7,544
Liabilities
Dividends declared but unpaid	79	75
Deferred federal income tax	252	173
Long-term debt	787	786
Other liabilities	65	83
Total liabilities	1,183	1,117
Shareholders' Equity
Common stock	397	397
Paid-in capital	1,252	1,232
Retained earnings	5,037	4,762
Accumulated other comprehensive income	1,693	1,344
Treasury stock at cost	(1,319)	(1,308)
Total shareholders' equity	7,060	6,427
Total liabilities and shareholders' equity	$ 8,243	$ 7,544

Condensed Financial Statemen107

Condensed Financial Statements Of Parent Company Condensed Balance Sheets (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions
Land, building and equipment, accumulated depreciation	$ 237	$ 459
Cincinnati Financial Corporation
Condensed Financial Statements, Captions
Land, building and equipment, accumulated depreciation	$ 111	$ 118

Condensed Financial Statemen108

Condensed Financial Statements Of Parent Company Condensed Statements Of Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Investment income, net of expenses									$ 595	$ 572	$ 549
Total									124	70	133
Other revenues									5	7	8
Total revenues	$ 1,312	$ 1,402	$ 1,371	$ 1,364	$ 1,263	$ 1,278	$ 1,316	$ 1,285	5,449	5,142	4,945
Expenses
Interest expense									53	53	53
Other expenses									12	13	14
Total expenses									4,637	4,261	4,224
Income (Loss) Before Income Taxes and Earnings of Subsidiaries	128	253	166	265	216	243	248	174	812	881	721
Benefit for income taxes									221	247	196
Net Income	$ 100	$ 180	$ 123	$ 188	$ 156	$ 174	$ 176	$ 128	591	634	525
Cincinnati Financial Corporation
Revenues
Investment income, net of expenses									56	53	46
Total									27	(19)	34
Other revenues									15	15	16
Total revenues									98	49	96
Expenses
Interest expense									52	52	52
Other expenses									27	28	28
Total expenses									79	80	80
Income (Loss) Before Income Taxes and Earnings of Subsidiaries									19	(31)	16
Benefit for income taxes									(6)	(23)	(5)
Net Income (Loss) Before Earnings of Subsidiaries									25	(8)	21
Increase in equity of subsidiaries									566	642	504
Net Income									$ 591	$ 634	$ 525

Condensed Financial Statemen109

Condensed Financial Statements Of Parent Company Condensed Statements Of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions
Net Income	$ 100	$ 180	$ 123	$ 188	$ 156	$ 174	$ 176	$ 128	$ 591	$ 634	$ 525
Unrealized gains and (losses) on investments available for sale									345	(405)	250
Unrealized gains and (losses) on investments available for sale, investments held by subsidiaries and other									521	(612)	388
Amortization of pension actuarial gains (losses) and prior service cost									16	(6)	(18)
Other comprehensive income (loss) before tax									537	(618)	370
Income taxes on above of other comprehensive income (loss)									188	(218)	130
Other comprehensive income (loss), net of tax									349	(400)	240
Comprehensive Income									940	234	765
Cincinnati Financial Corporation
Condensed Financial Statements, Captions
Net Income									591	634	525
Unrealized gains and (losses) on investments available for sale									221	(111)	150
Unrealized gains and (losses) on investments held by subsidiaries									434	(444)	367
Reclassification adjustment for (losses) and gains included in net income									(27)	19	(34)
Reclassification adjustment for (gains) included in net income on subsidiaries									(97)	(89)	(99)
Unrealized (losses) and gains on other									(6)	0	7
Unrealized (losses) and gains on other subsidiaries									$ (4)	$ 13	$ (3)

Supplementary Insurance Info110

Supplementary Insurance Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	$ 637	$ 616	$ 578
Gross future policy benefits, losses, claims and expense losses	7,728	7,265	6,957
Gross unearned premium	2,307	2,201	2,082
Other policy claims and benefits payable	28	36	25
Earned premiums	4,710	4,480	4,243
Investment income, net of expenses	539	518	502
Benefits, claims losses and settlement expense	3,107	2,808	2,856
Amortization of deferred policy acquisition costs	863	829	807
Underwriting, acquisition and insurance expenses	602	558	494
Net written premiums	4,582	4,363	4,146
Commercial Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	271	264	257
Gross future policy benefits, losses, claims and expense losses	4,179	3,925	3,797
Gross unearned premium	1,510	1,472	1,441
Earned premiums	3,089	2,996	2,856
Benefits, claims losses and settlement expense	1,928	1,708	1,812
Amortization of deferred policy acquisition costs	570	552	537
Underwriting, acquisition and insurance expenses	412	395	365
Net written premiums	3,122	3,025	2,922
Personal Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	110	103	108
Gross future policy benefits, losses, claims and expense losses	569	498	439
Gross unearned premium	629	593	562
Earned premiums	1,161	1,097	1,041
Benefits, claims losses and settlement expense	840	789	740
Amortization of deferred policy acquisition costs	209	210	209
Underwriting, acquisition and insurance expenses	128	113	84
Net written premiums	1,198	1,128	1,068
Excess and Surplus Lines Insurance
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	16	15	14
Gross future policy benefits, losses, claims and expense losses	241	227	202
Gross unearned premium	93	87	78
Earned premiums	183	168	148
Benefits, claims losses and settlement expense	68	70	75
Amortization of deferred policy acquisition costs	31	28	24
Underwriting, acquisition and insurance expenses	23	20	19
Net written premiums	189	175	153
Reinsurance assumed and other non segment [Member]
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	11	6	0
Gross future policy benefits, losses, claims and expense losses	46	10	0
Gross unearned premium	74	48	0
Earned premiums	49	10	0
Benefits, claims losses and settlement expense	25	5	0
Amortization of deferred policy acquisition costs	10	2	0
Underwriting, acquisition and insurance expenses	6	1	0
Net written premiums	71	33	0
Property, Liability and Casualty Insurance Product Line [Member]
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	408	388	379
Gross future policy benefits, losses, claims and expense losses	5,035	4,660	4,438
Gross unearned premium	2,306	2,200	2,081
Earned premiums	4,482	4,271	4,045
Investment income, net of expenses	384	368	358
Benefits, claims losses and settlement expense	2,861	2,572	2,627
Amortization of deferred policy acquisition costs	820	792	770
Underwriting, acquisition and insurance expenses	569	529	468
Net written premiums	4,580	4,361	4,143
Accident Health Insurance Segment [Member]
Supplementary Insurance Information, by Segment
Net written premiums	2	2	3
Life Insurance Segment
Supplementary Insurance Information, by Segment
Deferred policy acquisition costs	229	228	199
Gross future policy benefits, losses, claims and expense losses	2,693	2,605	2,519
Gross unearned premium	1	1	1
Other policy claims and benefits payable	28	36	25
Earned premiums	228	209	198
Investment income, net of expenses	155	150	144
Benefits, claims losses and settlement expense	246	236	229
Amortization of deferred policy acquisition costs	43	37	37
Underwriting, acquisition and insurance expenses	$ 33	$ 29	$ 26

Reinsurance (Details)

Reinsurance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts, life insurance in force	$ 95,533	$ 91,451	$ 88,045
Gross amounts	4,857	4,667	4,468
Ceded amounts to other companies, life insurance in force	38,724	38,716	37,689
Ceded amounts to other companies	224	216	237
Assumed amounts from other companies, life insurance in force	0	0	0
Assumed amounts from other companies	77	29	12
Net amounts, life insurance in force	56,808	52,735	50,356
Premiums Earned, Net	$ 4,710	$ 4,480	$ 4,243
Percentage of amounts assumed to net, life insurance in force	0.00%	0.00%	0.00%
Percentage of amounts assumed to net	1.60%	0.70%	0.50%
Commercial Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	$ 3,180	$ 3,088	$ 2,973
Ceded amounts to other companies	98	102	128
Assumed amounts from other companies	7	10	11
Premiums Earned, Net	$ 3,089	$ 2,996	$ 2,856
Percentage of amounts assumed to net	0.20%	0.30%	0.40%
Personal Insurance
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	$ 1,195	$ 1,131	$ 1,080
Ceded amounts to other companies	35	35	40
Assumed amounts from other companies	1	1	1
Premiums Earned, Net	$ 1,161	$ 1,097	$ 1,041
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	$ 192	$ 177	$ 156
Ceded amounts to other companies	9	9	8
Assumed amounts from other companies	0	0	0
Premiums Earned, Net	$ 183	$ 168	$ 148
Percentage of amounts assumed to net	0.00%	0.00%	0.00%
Reinsurance assumed and other non segment [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	$ 0	$ 0	$ 0
Ceded amounts to other companies	20	8	0
Assumed amounts from other companies	69	18	0
Premiums Earned, Net	$ 49	$ 10	$ 0
Percentage of amounts assumed to net	140.80%	188.00%	0.00%
Property, Liability And Casualty Insurance Segment [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	$ 4,567	$ 4,396	$ 4,209
Ceded amounts to other companies	162	154	176
Assumed amounts from other companies	77	29	12
Premiums Earned, Net	$ 4,482	$ 4,271	$ 4,045
Percentage of amounts assumed to net	1.70%	0.70%	0.50%
Life Insurance Segment
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Gross amounts	$ 290	$ 271	$ 259
Ceded amounts to other companies	62	62	61
Assumed amounts from other companies	0	0	0
Premiums Earned, Net	$ 228	$ 209	$ 198
Percentage of amounts assumed to net	0.00%	0.00%	0.00%

Valuation And Qualifying Acc112

Valuation And Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts [Abstract]
Beginning balance, January 1	$ 4	$ 3	$ 2
Additions charged to costs and expenses	5	3	2
Deductions	(4)	(2)	(1)
Ending balance, December 31	$ 5	$ 4	$ 3

Supplementary Information Co113

Supplementary Information Concerning Property Casualty Insurance Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	$ 408	$ 388	$ 379
Reserves for unpaid claims and claim adjustment expenses	5,035	4,660	4,438
Unearned premiums	2,306	2,200	2,081
Earned premiums	4,482	4,271	4,045
Investment income	384	368	358
Loss and loss expenses incurred related to current accident year	3,029	2,756	2,725
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(168)	(184)	(98)
Amortization of deferred policy acquisition cost	820	792	770
Paid loss and loss expenses	2,503	2,349	2,413
Net written premiums	4,580	4,361	4,143
Commercial Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	271	264	257
Reserves for unpaid claims and claim adjustment expenses	4,179	3,925	3,797
Unearned premiums	1,510	1,472	1,441
Earned premiums	3,089	2,996	2,856
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	2,057	1,862	1,869
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(129)	(154)	(57)
Amortization of deferred policy acquisition cost	570	552	537
Paid loss and loss expenses	1,675	1,575	1,666
Net written premiums	3,122	3,025	2,922
Personal Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	110	103	108
Reserves for unpaid claims and claim adjustment expenses	569	498	439
Unearned premiums	629	593	562
Earned premiums	1,161	1,097	1,041
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	844	784	752
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(4)	5	(12)
Amortization of deferred policy acquisition cost	209	210	209
Paid loss and loss expenses	771	731	717
Net written premiums	1,198	1,128	1,068
Excess and Surplus Lines Insurance
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	16	15	14
Reserves for unpaid claims and claim adjustment expenses	241	227	202
Unearned premiums	93	87	78
Earned premiums	183	168	148
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	102	105	104
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(34)	(35)	(29)
Amortization of deferred policy acquisition cost	31	28	24
Paid loss and loss expenses	55	43	30
Net written premiums	189	175	153
Reinsurance assumed and other non segment [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred policy acquisition costs	11	6	0
Reserves for unpaid claims and claim adjustment expenses	46	10	0
Unearned premiums	74	48	0
Earned premiums	49	10	0
Investment income	0	0	0
Loss and loss expenses incurred related to current accident year	26	5	0
Prior year claims and claims adjustment expense, (favorable) and unfavorable	(1)	0	0
Amortization of deferred policy acquisition cost	10	2	0
Paid loss and loss expenses	2	0	0
Net written premiums	$ 71	$ 33	$ 0