Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Fixed maturity securities at fair value	$ 40,605	$ 40,768
Equity securities at fair value	225	222
Limited partnership investments	2,967cna_LimitedPartnershipInvestments	2,937cna_LimitedPartnershipInvestments
Other invested assets	43us-gaap_OtherInvestments	41us-gaap_OtherInvestments
Mortgage loans	586	588
Short term investments	1,506us-gaap_ShortTermInvestments	1,706us-gaap_ShortTermInvestments
Total investments	45,932us-gaap_Investments	46,262us-gaap_Investments
Cash	201us-gaap_Cash	190us-gaap_Cash
Reinsurance receivables	4,720us-gaap_ReinsuranceRecoverables	4,694us-gaap_ReinsuranceRecoverables
Insurance receivables	2,050	1,936
Accrued investment income	430	405
Deferred acquisition costs	616us-gaap_DeferredPolicyAcquisitionCosts	600us-gaap_DeferredPolicyAcquisitionCosts
Deferred income taxes	57us-gaap_DeferredTaxAssetsLiabilitiesNet	191us-gaap_DeferredTaxAssetsLiabilitiesNet
Property and equipment at cost	298us-gaap_PropertyPlantAndEquipmentNet	295us-gaap_PropertyPlantAndEquipmentNet
Goodwill	151us-gaap_Goodwill	152us-gaap_Goodwill
Other assets	1,010us-gaap_OtherAssets	841us-gaap_OtherAssets
Total assets	55,465us-gaap_Assets	55,566us-gaap_Assets
Liabilities
Claim and claim adjustment expenses	23,248	23,271
Unearned premiums	3,710us-gaap_UnearnedPremiums	3,592us-gaap_UnearnedPremiums
Future policy benefits	9,747	9,490
Policyholders’ funds	0us-gaap_PolicyholderContractDeposits	27us-gaap_PolicyholderContractDeposits
Long term debt	2,560us-gaap_LongTermDebtNoncurrent	2,559us-gaap_LongTermDebtNoncurrent
Other liabilities	3,763us-gaap_OtherLiabilities	3,833us-gaap_OtherLiabilities
Total liabilities	43,028us-gaap_Liabilities	42,772us-gaap_Liabilities
Stockholders' Equity
Common stock	683us-gaap_CommonStockValue	683us-gaap_CommonStockValue
Additional paid-in capital	2,143	2,151
Retained earnings	9,270	9,645
Accumulated other comprehensive income (loss)	421	400
Treasury stock	(79)us-gaap_TreasuryStockValue	(84)us-gaap_TreasuryStockValue
Notes receivable for the issuance of common stock	(1)	(1)
Total stockholders’ equity	12,437us-gaap_StockholdersEquity	12,794us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 55,465	$ 55,566

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Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Carrying amount of premiums written on insurance contracts that have not been earned as of the balance sheet date.

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