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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Debt Instrument |  |  |  |  |
Issues of variable interest entities | $ 0 |  | $ 360 |  | $ 1,000
Issues of power bonds | 989 |  | 2,122 |  | 1,126
Amount | 395 |  | 2,371 |  |
Redemptions/Maturities of variable interest entities | 30 |  | 13 |  | 6
Redemptions/Maturities of power bonds | 365 |  | 2,358 |  | 2,717
Discount on debt issues | (11) |  | (30) |  |
Debt of variable interest entities |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of variable interest entities | 30 | [1] | 13 | [1] |
Electronotes |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 335 | [1] | 50 | [1] |
1998 Series C |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | [1] | 1,359 | [1] |
1998 Series D |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | [1] | 2 | [1] |
1999 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | [1] | 1 | [1] |
2003 Series C |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | [1] | 940 | [1] |
2009 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 4 | [1] | 4 | [1] |
2009 Series B |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 26 | [1] | 2 | [1] |
2013 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Percent of par value |  |  | 99.52% |  |
2014 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Percent of par value | 98.94% |  |  |  |
Total |  |  |  |  |
Debt Instrument |  |  |  |  |
Percent of par value | 100.00% |  |  |  |
Debt of variable interest entities |  |  |  |  |
Debt Instrument |  |  |  |  |
Issues of variable interest entities | 0 |  | 360 |  |
Electronotes |  |  |  |  |
Debt Instrument |  |  |  |  |
Issues of power bonds | 0 |  | 152 |  |
2012 Series B |  |  |  |  |
Debt Instrument |  |  |  |  |
Issues of power bonds | 0 |  | 1,000 | [2] |
Percent of par value |  |  | 97.49% |  |
2013 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Issues of power bonds | 0 |  | 1,000 | [3] |
2014 Series A |  |  |  |  |
Debt Instrument |  |  |  |  |
Issues of power bonds | 1,000 | [4] | 0 |  |
Total |  |  |  |  |
Debt Instrument |  |  |  |  |
Amount | $ 989 |  | $ 2,482 |  |
[1] | All redemptions were at 100 percent of par.
[2] | The 2012 Series B bonds were issued at 97.49 percent of par.
[3] | The 2013 Series A bonds were issued at 99.52 percent of par.
[4] | The 2014 Series A bonds were issued at 98.94 percent of par.

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- Definition The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28567-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition The cash inflow from other long-term borrowings not otherwise defined in the taxonomy (with maturities initially due beyond one year or the normal operating cycle of the entity, if longer). + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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