Commitments And Contingencies (Third-Party Power Purchases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
2015	$ 4,248
2016	3,769
2017	3,601
2018	3,398
2019	3,279
Thereafter	34,973
Total	53,268
Renewable Energy Power Purchase Agreements [Member]
Long-term Purchase Commitment [Line Items]
2015	2,145
2016	2,185
2017	2,187
2018	2,063
2019	2,053
Thereafter	30,289
Total	40,922
Qualifying Facilities [Member]
Long-term Purchase Commitment [Line Items]
2015	601
2016	525
2017	418
2018	382
2019	304
Thereafter	1,217
Total	3,447
Other Power Purchase Agreements [Member]
Long-term Purchase Commitment [Line Items]
2015	820
2016	766
2017	758
2018	731
2019	706
Thereafter	2,390
Total	6,171
Nuclear Fuel Purchase Commitments [Member]
Long-term Purchase Commitment [Line Items]
2015	138
2016	129
2017	131
2018	115
2019	109
Thereafter	429
Total	1,051
Natural Gas [Member]
Long-term Purchase Commitment [Line Items]
2015	544
2016	164
2017	107
2018	107
2019	107
Thereafter	648
Total	$ 1,677

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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

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Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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+ References

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Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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