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Debt and Other Obligations Debt Securities Activity (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Debt Instrument
Long-term notes payable		$ 1
Total long-term debt, net		20,030		$ 20,183
Redemptions/maturities of power bonds		218	$ 1,002
Total redemptions/maturities of debt	[1]	(218)
electronotes [Member]
Debt Instrument
Redemptions/maturities of power bonds		217
2009 Series B [Member]
Debt Instrument
Redemptions/maturities of power bonds		1
2013 Series A [Member]
Debt Instrument
Redemptions/maturities of power bonds
Total
Debt Instrument
Percent of par value		100.00%
electronotes [Member]
Debt Instrument
Debt Instrument, Interest Rate, Effective Percentage		0.00%
2009 Series B [Member]
Debt Instrument
Debt Instrument, Interest Rate, Effective Percentage		0.00%
[1] (1) Amounts for notes payable were less than$1 million at December 31, 2019, and are therefore not represented in the table above.(2) All redemptions were at 100 percent of par.

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The percent of par value that debt was issued/redeemed for.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Amount of cash inflow (outflow) for debt classified as other.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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