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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument |  |  |
Redemptions/maturities of power bonds |  | $ 527 | $ 4
Total redemptions/maturities of debt | [1] | 527 |
electronotes |  |  |
Debt Instrument |  |  |
Redemptions/maturities of power bonds |  | $ 1 |
Interest rate |  | 2.65% |
2009 Series B |  |  |
Debt Instrument |  |  |
Redemptions/maturities of power bonds |  | $ 1 |
Interest rate |  | 3.77% |
2001 Series D |  |  |
Debt Instrument |  |  |
Redemptions/maturities of power bonds |  | $ 525 |
Interest rate |  | 4.875% |
Total |  |  |
Debt Instrument |  |  |
Percent of par value |  | 100.00% |
[1] | All redemptions were at 100 percent of par.

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