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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Dec. 31, 2015	Nov. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument
Redemptions/maturities of power bonds			$ 4	$ 4
Total redemptions/maturities of debt			4
electronotes
Debt Instrument
Redemptions/maturities of power bonds			$ 1
Interest rate	2.65%		2.65%
2009 Series A
Debt Instrument
Redemptions/maturities of power bonds		$ 2
Interest rate		2.25%
2009 Series B
Debt Instrument
Redemptions/maturities of power bonds	$ 1
Interest rate	3.77%		3.77%
Total
Debt Instrument
Percent of par value	100.00%		100.00%

X

- Definition

The percent of par value that debt was issued/redeemed for.

+ References

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

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