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Derivative Financial Instruments and Hedging Activities - Narrative (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Foreign Currency Swaps [Member] | Derivative Financial Instruments, Liabilities [Member]  
Derivative [Line Items]  
Payments to Fund Long-term Loans to Related Parties $ 1,000,000,000us-gaap_PaymentsToFundLongtermLoansToRelatedParties
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
Currency Swap [Member]  
Derivative [Line Items]  
Derivative, Notional Amount $ 550,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CurrencySwapMember