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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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