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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($)
$ in Millions

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Debt Instrument

Issues of power bonds

$ 973

$ 989

$ 2,122

Discount on debt issues

(27)

(11)

Total

1,212

395

Redemptions/Maturities of variable interest entities

32

30

13

Redemptions/Maturities of power bonds

$ 1,180

365

$ 2,358

2014 Series A

Debt Instrument

Percent of par value

98.94%

2015 Series A

Debt Instrument

Percent of par value

97.31%

Debt of variable interest entities

Debt Instrument

Redemptions/Maturities of variable interest entities

^[1]

$ 32

30

Electronotes

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

62

335

1998 Series D

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

50

0

1999 Series A

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

38

0

2005 Series B

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

1,000

0

2009 Series A

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

3

4

2009 Series B

Debt Instrument

Redemptions/Maturities of power bonds

^[1]

$ 27

26

Total

Debt Instrument

Percent of par value

100.00%

2014 Series A

Debt Instrument

Issues of power bonds

^[2]

$ 0

1,000

2015 Series A

Debt Instrument

Issues of power bonds

^[3]

1,000

0

Total

Debt Instrument

Total

$ 973

$ 989

[1]	All redemptions were at 100 percent of par.
[2]	The 2014 Series A bonds were issued at 98.94 percent of par.
[3]	The 2015 Series A bonds were issued at 97.31 percent of par.

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