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Commitments and Contingencies Commitments and Contingencies - Debt (Details) (USD $) In Billions, unless otherwise specified	Sep. 30, 2013 variable_interest_entities
Debt Instrument
Outstanding discount notes	$ 2.4
Outstanding long-term debt including current maturities)	22.4
Long-term and short-term debt combined	24.8
Number of VIEs	3
Outstanding long-term debt (including current maturities) of VIEs	$ 1.3

X

- Definition

Long-term power bonds including current maturities

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Number of VIEs

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Total outstanding discount notes

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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- Details

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Period Type:	duration

X

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

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