Property, Plant and Equipment (Narrative) (Details) (Oil and Gas Properties, USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
Dec. 31, 2013 Natural_Gas_Producer acre	Dec. 31, 2013 acre
Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Number of natural gas producers	2
Acres of Marcellus Shale rights	100,000	100,000
Agreed upon payments for conveyance of acres of natural gas storage fields	$ 200	$ 200
Period for payments related to conveyance of natural gas storage fields	9 years
Cash proceeds received from sale		100
Gain from sale		20
After tax gain on sale		12
Deferred Revenue, Additions		$ 80

Gain (Loss) on Disposition of Property Plant And Equipment, Net of Tax

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- Definition

Significant Acquisitions and Disposals, Number of Natural Gas Producers that Rights in Acreage were Conveyed

+ References

No definition available.

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- Definition

Significant Acquisitions and Disposals, Period for Payments Related to Conveyance of Natural Gas Storage Fields

+ References

No definition available.

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- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 2

-Paragraph 4

-Subparagraph A

+ Details

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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