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Insurance (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property and casualty companies [Member]      
Statutory information      
Net Earnings $ 318us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 $ 332us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 $ 221us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Capital and Surplus 2,286us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 1,896us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_ProductOrServiceAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		  
Life insurance companies [Member]      
Statutory information      
Net Earnings 349us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember		 294us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember		 171us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember
Capital and Surplus $ 1,714us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember		 $ 1,619us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance
/ us-gaap_ProductOrServiceAxis
= us-gaap_LifeInsuranceSegmentMember