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Financial Guarantees (Textual) (Details) (Financial Standby Letter of Credit [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Financial Standby Letter of Credit [Member]
      
Financial Guarantees (Textual) [Abstract]      
Letters of credit outstanding $ 38us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		 $ 41us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		 $ 45us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_FinancialStandbyLetterOfCreditMember
Expiration period for letters of credit, maximum 5 years