Significant Accounting Policies Significant Accounting Policies (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 46	$ 53
Intangible Assets, Current	9us-gaap_IntangibleAssetsCurrent	12us-gaap_IntangibleAssetsCurrent
Finite-Lived Intangible Assets, Net	37us-gaap_FiniteLivedIntangibleAssetsNet	41us-gaap_FiniteLivedIntangibleAssetsNet
Renewable Energy Credits [Member]
Finite Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	45	51
Emission Allowances [Member]
Finite Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 1	$ 2

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

The current portion of nonphysical assets, excluding financial assets, if these assets are classified into the current and noncurrent portions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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