Commitments And Contingencies (Third-Party Power Purchases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
2014	$ 3,648
2015	3,579
2016	3,418
2017	3,238
2018	3,008
Thereafter	34,840
Total	51,731
QF Energy Payments [Member]
Long-term Purchase Commitment [Line Items]
2014	913
2015	707
2016	587
2017	450
2018	406
Thereafter	1,614
Total	4,677
Renewable (Other Than QF) Energy [Member]
Long-term Purchase Commitment [Line Items]
2014	1,906
2015	2,102
2016	2,109
2017	2,104
2018	1,962
Thereafter	30,242
Total	40,425
Other, Energy Payments [Member]
Long-term Purchase Commitment [Line Items]
2014	829
2015	770
2016	722
2017	684
2018	640
Thereafter	2,984
Total	$ 6,629

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Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308

+ Details

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Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year.

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Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year.

+ References

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