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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		1 Months Ended			3 Months Ended						9 Months Ended
		Jun. 30, 2016	Dec. 31, 2015	Nov. 30, 2015	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Jun. 30, 2016	Jun. 30, 2015
Debt Instrument
Redemptions/maturities of power bonds					$ 35	[1]					$ 35	$ 1,180
Redemptions/maturities of variable interest entities											16	$ 15
Total redemptions/maturities of debt	[1]										$ 51
electronotes
Debt Instrument
Redemptions/maturities of power bonds					$ 3		$ 2	[1]	$ 1	[1]
Interest rate		2.97%	2.65%		2.97%		3.51%		2.65%		2.97%
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]	$ 26	$ 1
Interest rate		3.77%	3.77%		3.77%				3.77%		3.77%
Debt of variable interest entities
Debt Instrument
Redemptions/maturities of variable interest entities	[1]										$ 16
Interest Rate of variable interest entities		4.30%			4.30%						4.30%
Total
Debt Instrument
Percent of par value		100.00%			100.00%						100.00%
[1] All redemptions were at 100 percent of par.

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

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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=64930785&loc=d3e28551-108399

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Amount of cash inflow (outflow) for debt classified as other.

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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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Amount of cash outflow for the payment of debt classified as other, maturing after one year or 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=66902209&loc=d3e3291-108585

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

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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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-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

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