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Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	9 Months Ended
	Sep. 30, 2015 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	250,000
Weighted Average Price Swap	4.32
FERC Henry Hub Price Collars Natural Gas Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	480,000
Weighted Average Floor Price	3.52
Weighted Average Ceiling Price	3.83
FERC Henry Hub Call Options Sold Natural Gas Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	550,000
Weighted Average Call Option Sold Price	5.09
FERC Henry Hub Price Swaps Natural Gas Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	24,863
Weighted Average Price Swap	3.17
FERC Henry Hub Price Collars Natural Gas Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU
Weighted Average Floor Price
Weighted Average Ceiling Price
FERC Henry Hub Call Options Sold Natural Gas Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	400,000
Weighted Average Call Option Sold Price	4.73
PEPL Basis Swaps Natural Gas Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	100,000
Weighted Average Differential To Henry Hub	(0.28)
El Paso Natural Gas Basis Swaps Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	70,000
Weighted Average Differential To Henry Hub	(0.11)
Houston Ship Channel Natural Gas Basis Swaps Q4 2015 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	200,000
Weighted Average Differential To Henry Hub	0.01
PEPL Basis Swaps Natural Gas Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	175,000
Weighted Average Differential To Henry Hub	(0.34)
El Paso Natural Gas Basis Swaps Q1-Q4 2016 [Member
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	15,000
Weighted Average Differential To Henry Hub	(0.13)
Houston Ship Channel Natural Gas Basis Swaps Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	30,000
Weighted Average Differential To Henry Hub	0.11
Transco Zone 4 Natural Gas Basis Swaps Q1-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	60,000
Weighted Average Differential To Henry Hub	0.01
PEPL Basis Swaps Natural Gas Q1-Q4 2017 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	60,000
Weighted Average Differential To Henry Hub	(0.34)
El Paso Natural Gas Basis Swaps Q1-Q4 2017 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	30,000
Weighted Average Differential To Henry Hub	(0.14)
Houston Ship Channel Natural Gas Basis Swaps Q1-Q4 2017 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	35,000
Weighted Average Differential To Henry Hub	0.06
Transco Zone 4 Natural Gas Basis Swaps Q1-Q4 2017 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) | MMBTU	85,000
Weighted Average Differential To Henry Hub	0.04

X

- Definition

Weighted Average Differential To Henry Hub

+ References

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- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

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- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

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- Definition

The average strike price on the group of price risk option contracts such as put options or call options.

+ References

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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