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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, 2015	May. 31, 2015	Dec. 31, 2014	Nov. 30, 2014	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument
Redemptions/maturities of power bonds									$ 1,180	$ 363
Redemptions/maturities of variable interest entities									15	$ 15
Total redemptions/maturities of debt									$ 1,195
electronotes
Debt Instrument
Redemptions/maturities of power bonds	[1]					$ 19	$ 42	$ 1
Interest rate		4.05%		2.65%		4.05%	4.20%	2.65%	4.05%
2009 Series A
Debt Instrument
Redemptions/maturities of power bonds	[1]		$ 1		$ 2
Interest rate			2.25%		2.25%
1998 Series D
Debt Instrument
Redemptions/maturities of power bonds	[1]	$ 50
Interest rate		3.83%				3.83%			3.83%
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%
2005 Series B
Debt Instrument
Redemptions/maturities of power bonds	[1]	$ 1,000
Interest rate		4.38%				4.38%			4.38%
1999 Series A
Debt Instrument
Redemptions/maturities of power bonds	[1]		$ 38
Interest rate			3.96%
Debt of variable interest entities
Debt Instrument
Redemptions/maturities of variable interest entities	[1]						$ 15
Interest rate of variable interest entities							4.29%
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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