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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
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Debt Instrument |  |  |  |
Amount | $ 2,371 |  | $ 2,723 |
Discount on debt issues | (30) |  | (9) |
Debt of variable interest entities |  |  |  |
Debt Instrument |  |  |  |
Amount | 13 | [1] | 6 | [1]
Electronotes |  |  |  |
Debt Instrument |  |  |  |
Amount | 50 | [1] | 189 | [1]
1992 Series D |  |  |  |
Debt Instrument |  |  |  |
Amount | 0 | [1] | 1,000 | [1]
1998 Series C |  |  |  |
Debt Instrument |  |  |  |
Amount | 1,359 | [1] | 0 | [1]
1998 Series D |  |  |  |
Debt Instrument |  |  |  |
Amount | 2 | [1] | 5 | [1]
1999 Series A |  |  |  |
Debt Instrument |  |  |  |
Amount | 1 | [1] | 2 | [1]
2000 Series F |  |  |  |
Debt Instrument |  |  |  |
Amount | 0 | [1] | 29 | [1]
2002 Series A |  |  |  |
Debt Instrument |  |  |  |
Amount | 0 | [1] | 1,486 | [1]
2003 Series C |  |  |  |
Debt Instrument |  |  |  |
Amount | 940 | [1] | 0 | [1]
2009 Series A |  |  |  |
Debt Instrument |  |  |  |
Amount | 4 | [1] | 4 | [1]
2009 Series B |  |  |  |
Debt Instrument |  |  |  |
Amount | 2 | [1] | 2 | [1]
Total |  |  |  |
Debt Instrument |  |  |  |
Percent of par value | 100.00% |  |  |
Debt of variable interest entities |  |  |  |
Debt Instrument |  |  |  |
Amount | 360 |  | 1,000 |
Electronotes |  |  |  |
Debt Instrument |  |  |  |
Amount | 152 |  | 135 |
2012 Series A |  |  |  |
Debt Instrument |  |  |  |
Percent of par value |  |  | 99.12% |
Amount | 0 |  | 1,000 | [2]
2012 Series B |  |  |  |
Debt Instrument |  |  |  |
Percent of par value | 97.49% |  |  |
Amount | 1,000 | [3] | 0 |
2013 Series A |  |  |  |
Debt Instrument |  |  |  |
Percent of par value | 99.52% |  |  |
Amount | 1,000 | [4] | 0 |
Total |  |  |  |
Debt Instrument |  |  |  |
Amount | $ 2,482 |  | $ 2,126 |
[1] | All redemptions were at 100 percent of par.
[2] | The 2012 Series A bonds were issued at 99.12 percent of par.
[3] | The 2012 Series B bonds were issued at 97.49 percent of par.
[4] | The 2013 Series A bonds were issued at 99.52 percent of par.

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- Definition The percent of par value that debt was issued/redeemed for. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Details
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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=6584090&loc=d3e28878-108400 + Details
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Balance Type: | debit
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- Definition The net cash inflow or outflow in other borrowings not otherwise defined in the taxonomy. + 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 + Details
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