Derivative Financial Instruments (Schedule Of Open Natural Gas Derivative Positions) (Details)	3 Months Ended
Mar. 31, 2016 MMBTU $ / MMBTU
FERC Henry Hub Price Swaps Natural Gas Q2 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	481,400
Weighted Average Price Swap	2.73
FERC Henry Hub Price Collars Natural Gas Q2 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	4,945
Weighted Average Floor Price	1.77
Weighted Average Ceiling Price	2.02
FERC Henry Hub Call Options Sold Natural Gas Q2 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	400,000
Weighted Average Call Option Sold Price	2.80
FERC Henry Hub Call Options Sold Natural Gas Q3 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	400,000
Weighted Average Call Option Sold Price	2.80
FERC Henry Hub Call Options Sold Natural Gas Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	400,000
Weighted Average Call Option Sold Price	2.80
PEPL Basis Swaps Natural Gas Q2-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 Q2-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	125,000
Weighted Average Differential To Henry Hub	(0.12)
Houston Ship Channel Natural Gas Basis Swaps Q2-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 Q2-Q4 2016 [Member]
Derivatives, Fair Value [Line Items]
Volume Per Day (MMBtu/d) \| MMBTU	70,000
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	150,000
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	60,000
Weighted Average Differential To Henry Hub	(0.13)
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	205,000
Weighted Average Differential To Henry Hub	0.03

Weighted Average Differential To Henry Hub

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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.

+ Details

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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

No definition available.

+ Details

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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

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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

No definition available.

+ Details

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