Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivative Assets
Fair Value	$ 314	$ 239
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(189)	(110)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	(4)	(9)
Net Fair Value	121	120
Derivative Liabilities
Fair Value	(383)	(347)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	189	110
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	3	12
Net Fair Value	(191)	(225)
Power Contracts
Derivative Assets
Fair Value	304	215
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(182)	(106)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	(4)	(9)
Net Fair Value	118	100
Derivative Liabilities
Fair Value	(187)	(113)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	182	106
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	2	7
Net Fair Value	(3)	0
FTRs
Derivative Assets
Fair Value	7	4
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	(7)	(4)
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	0	0
Derivative Liabilities
Fair Value	(8)	(12)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	7	4
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	1	5
Net Fair Value	0	(3)
NUGs
Derivative Assets
Fair Value	3	20
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	3	20
Derivative Liabilities
Fair Value	(188)	(222)
Amounts Not Offset in Consolidated Balance Sheet, Derivative Instruments	0	0
Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral (Received)/Pledged	0	0
Net Fair Value	$ (188)	$ (222)

Derivative Assets, Fair Value, Amounts Offset Against Derivative Liabilities

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Derivative Liabilities, Fair Value, Amounts Offset Against Derivative Assets

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No definition available.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 10

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

+ References

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section 50

-Paragraph 3

-Subparagraph (e)

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-Publisher FASB

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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