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Debt and Other Obligations Debt and Other Obligations - Debt Securities Activity (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 20, 2016 | Jan. 17, 2012
Debt Instrument |  |  |  |  |
Issues of power bonds | $ 0 | $ 998 | $ 999 |  |
Face Amount | 40 |  |  |  | $ 100
Discount on debt issues |  | (2) |  |  |
Acquisition of notes payable |  |  | 74 |  |
Redemptions/Maturities of variable interest entities | 38 | 36 | 35 |  |
Redemptions/Maturities of power bonds | $ 1,035 | $ 1,731 | $ 1,558 |  |
Leaseback obligation settled as a result of acquisition |  |  |  | $ 70 |
Total |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt Instrument, Redemption Period, End Date | 1119 | 1820 |  |  |
Percent of par value | 100.00% |  |  |  |
Debt of variable interest entities |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of variable interest entities | $ 38 | $ 36 |  |  |
Notes Payable |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of notes payable | 46 | 53 |  |  |
electronotes |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 5 | 52 |  |  |
2013 Series A [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 1,000 | 0 |  |  |
2009 Series B |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 30 | 29 |  |  |
1997 Series E [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | 650 |  |  |
2008 Series B [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Redemptions/Maturities of power bonds | 0 | 1,000 |  |  |
Total |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt Securities Issues | $ 0 | 998 |  |  |
2018 Issue [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Face Amount |  | $ 1,000 |  |  |

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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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