Derivative Financial Instruments (Schedule Of Open Foreign Exchange Rate Derivative Positions) (Details) (Forward Contract Expiration June 2015 [Member], CAD) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015
Forward Contract Expiration June 2015 [Member]
Derivative [Line Items]
Currency	Canadian Dollar
Contract Type	Sell
CAD Notional	1,884
Weighted Average Fixed Rate Received	0.799
Expiration	Jun. 01, 2015

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

- 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

- 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

- 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

- Details

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

- 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