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Long-Term Debt (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary showing division of total long-term debt    
Obligations secured by real estate $ 59us-gaap_SecuredDebt $ 61us-gaap_SecuredDebt
Long-term debt 1,061us-gaap_LongTermDebt 913us-gaap_LongTermDebt
Senior unsecured obligations [Member]    
Summary showing division of total long-term debt    
Unsecured obligations 852us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember		 852us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
Subordinated unsecured obligations [Member]    
Summary showing division of total long-term debt    
Unsecured obligations $ 150us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember		 $ 0us-gaap_UnsecuredDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember