Schedule of Other Intangible Assets (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||
---|---|---|---|---|---|---|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
||||
Amortization of deferred acquisition costs | $ 1,317us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | $ 1,362us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | $ 1,274us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense | |||
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 1us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths | |||||
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo | |||||
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree | |||||
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour | |||||
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive | |||||
International [Member] | ||||||
Amortization of deferred acquisition costs | 204us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
223us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
152us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
[1] | ||
Other Intangible Assets [Member] | International [Member] | ||||||
Amortization of deferred acquisition costs | 2us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
15us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
33us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
|||
Amortization expense included in other operating expenses | $ 1cna_AmortizationExpenseIncludedInOtherOperatingExpenses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
$ 5cna_AmortizationExpenseIncludedInOtherOperatingExpenses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
$ 10cna_AmortizationExpenseIncludedInOtherOperatingExpenses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember / us-gaap_StatementBusinessSegmentsAxis = cna_InternationalMember |
|||
|
X | ||||||||||
- Definition
Amortization expense included in other operating expenses No definition available.
|
X | ||||||||||
- Definition
Amount of expense related to deferred policy acquisition costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Definition
Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
X | ||||||||||
- Details
|
X | ||||||||||
- Details
|