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Derivative Financial Instruments (Schedule Of Open Foreign Exchange Rate Derivative Positions) (Details) (Forward Contract [Member], CAD) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Forward Contract [Member] |
Derivative [Line Items] |
Currency | Canadian Dollar
Contract Type | Sell
CAD Notional | 1,884 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Weighted Average Fixed Rate Received | 0.864 us-gaap_DerivativeAverageForwardExchangeRate1 / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Expiration | Mar. 01, 2015

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition The entity's designation of its position on the foreign currency contract being described. This flag can only have the values of "Buy" or "Sell". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
Name: | invest_InvestmentForeignCurrencyContractTransactionTypeFlag
Namespace Prefix: | invest_
Data Type: | invest:foreignCurrencyContractTransactionItemType
Balance Type: | na
Period Type: | duration

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- Definition Average contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
Name: | us-gaap_DerivativeAverageForwardExchangeRate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Identification of the specific currency to be sold upon settlement or exercise of the foreign currency derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeCurrencySold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_MaturityOfForeignCurrencyDerivatives1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration