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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		1 Months Ended		3 Months Ended			6 Months Ended
		Dec. 31, 2015	Nov. 30, 2015	Mar. 31, 2016		Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Debt Instrument
Redemptions/maturities of power bonds				$ 6	[1]		$ 6	$ 46
Total redemptions/maturities of debt	[1]			22
Redemptions/maturities of variable interest entities							$ 16	$ 15
Debt of variable interest entities
Debt Instrument
Redemptions/maturities of variable interest entities	[1]			$ 16
Interest Rate				4.30%			4.30%
electronotes
Debt Instrument
Redemptions/maturities of power bonds	[1]			$ 2		$ 1
Interest rate		2.65%		3.51%		2.65%	3.51%
2009 Series A
Debt Instrument
Redemptions/maturities of power bonds	[1]		$ 2
Interest rate			2.25%
2009 Series B
Debt Instrument
Redemptions/maturities of power bonds	[1]	$ 1
Interest rate		3.77%				3.77%
Total
Debt Instrument
Percent of par value				100.00%			100.00%
[1] All redemptions were at 100 percent of par.

X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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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

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 attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: 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

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

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